Section

  • This section

    May 1: chpt 28

    May 2: chpt 28
    May 3: English AP exam, come to class if you're not in it
    May 4: US Gov AP exam, come to class if you're not in it
    May 5: Start MRI material

    May 8:  chpt 28
    May 9: Calc AP exam, come to class if you're not in it
    May 10: chpt 28
    May 11:  finish chpt 28
    May 12:  chpt 32 and high energy particle physics

    May 15: review for exam 2
    May 16: exam 2
    May 17: finish MRI material
    May 18: tour U of M CMMR
    May 19: field day, no class

    May 22: review exam 2 -- revision officially starts, but we might need to finish some material from 32.
    May 23:
    May 24: 
    May 25:
    May 26:

    May 29: Memorial Day holiday
    May 30: Math exam
    May 31: review
    June 1: review
    June 2: honors convocation, no class

    June 7: Final Exam

    ___________________________________________________________________________________________________________

    A birthday this week.

    On 29 May 1929, Peter Ware Higgs was born in Newcastle upon Tyne, United Kingdom. Higgs graduated with honors in physics in 1950 from King’s College, University of London. He earned his master of science the next year, and his PhD in 1954, both from King’s. In his early thirties, Higgs began his career as lecturer in mathematical physics at the University of Edinburgh, and in 1970 was promoted to reader. 

    In the 1960s, Higgs proposed the existence of a single particle responsible for imparting mass to all matter immediately following the Big Bang (The Guardian, Nov. 16, 2007). The Higgs boson, the scientific term for the particle, radically altered the field of physics, such that Higgs, according to Time Magazine, ranks with physics giants like Albert Einstein, Isaac Newton and Democritus. Based on Higgs’ theory, scientists theorized a quantum field, known as the Higgs field, through which initially weightless particles move and acquire their mass. For the last thirty years, a multi-billion dollar effort, including the construction of the Large Hadron Collider (LHC) at the CERN laboratory in Geneva, Switzerland, has been underway to find the Higgs boson particle. The LHC , the most powerful particle accelerator ever constructed, cost $6 billion and 25 years to plan. “Scientists . . . hope the [Large Hadron Collider] will produce clear signs of the boson, dubbed the ‘God particle’ by some, to the displeasure of Higgs, an atheist” (Reuters, “Key scientist sure ‘God particle’ will be found soon,” by Robert Evans, April 7, 2008).   And innocently, he nicknamed the Higgs boson the "God particle".

    "I wish he hadn't done it. I have to explain to people it was a joke. I'm an atheist. . . "—Peter Higgs,

  • HW due Monday: Bring a one page list of classic or typical problems from chapters 16, 17, and 18. Bring your exams from Term 1.  Also watch http://www.wimp.com/tendimensions/.  

    HW due Wednesday: we don't have a list of classic problems for chapters 28 and 32.  Propose a list of the 10 top concepts for these chapters, based on what we have studied in class, and what could possibly be used for exam problems.

    HW due Thursday: do any questions posed in pages 1-6 of "final review 1" in files.

    HW due Friday:  do any questions posed in pages 7-12 of "final review 1" in files.

    HW due next Monday: memorial day

    next Wed: bring the hardest question from your periodics to class to share.     

    Due next Thurs: Practice test handout.

    Due next Friday: honors convocation in the afternoon

  • Chapter 32 will be on the final exam.  Powerpoint slides will not be posted, so your notes from class will be necessary for you to know how I've covered the material.  

    The size of the LHC constitutes an exceptional engineering challenge with unique operational issues on account of the amount of energy stored in the magnets and the beams.[41][117] While operating, the total energy carried by the two beams reaches 724 MJ (173 kilograms of TNT).[118]. These energies are carried by very little matter: under nominal operating conditions (2,808 bunches per beam, 1.15×1011 protons per bunch), the beam pipes contain 1.0×10−9 gram of hydrogen, which as a gas at STP would be a spec

    HW due Monday: 32: Q-4, 7, 19 

    Tuesday:  exam 2 in class.   chapter 22 plus QFT up through QED and includes MRI plus the paper by Hobson
    Here's an example question: Describe briefly how NMR (MRI) works.  Use these terms: main B field, resonating (RF) field, precession, spin, relaxation.  Be specific about how the proton sends a radio signal to the pickup antenna

    HW due Wednesday:  MRI preview any random RESEARCH HIGHLIGHT on this page and summarize the most interesting points to the class in 3 minutes .https://www.cmrr.umn.edu/research2016/index.php

    (and speaking of CERN: http://home.web.cern.ch/about/birth-web)

    HW due Thursday: We will tour the magnet lab. Meet in the classroom promptly at 11:10.  Non uniform but you must look professional.  No open toe shoes, no sweatshirts, no jeans, no T-shirts. 

    HW due Friday:  no class, ISM FIELD DAY

    . Watch Brian Cox on the LHC .

    HW due next Monday: Bring a one page list of classic or typical problems from chapters 16, 17, and 18. Bring your exams from Term 1.  Also watch http://www.wimp.com/tendimensions/.

  • Note: these 3 weeks in this class challenge you to study and engage at a higher level.  I'm treating you like a college student.  If you are confused on what you should be able to demonstrate for the exams, please come see me.

    HW due Monday: 32: Q-3; P 1,3,5,9,17  S&L 2

    Tuesday: some of you taking AP Calc, the rest, come to class.   (Linnea and Bao, if you finish the AP exam before 11:00, please come directly to class; do not go out for lunch, or take a walk in the woods, etc.)

    HW due Wednesday: read 32-1 and 32-2.  The cyclotron equations are the only quantitative part of this chapter.  Learn them.

    HW due Thursday: none.  

    HW due Friday:  Describe in one paragraph, with a sketch, the MINOS experiment in the Tower mine in Minnesota . Watch Brian Cox on the LHC  .

    The size of the LHC constitutes an exceptional engineering challenge with unique operational issues on account of the amount of energy stored in the magnets and the beams.[41][117] While operating, the total energy carried by the two beams reaches 724 MJ (173 kilograms of TNT).[118]. These energies are carried by very little matter: under nominal operating conditions (2,808 bunches per beam, 1.15×1011 protons per bunch), the beam pipes contain 1.0×10−9 gram of hydrogen, which as a gas at STP would be a spec.

    HW due next Monday: 32: Q-4, 7, 19 .

    the Exam next Tuesday is on chapter 22 plus QFT up through QED and includes MRI plus the paper by Hobson

    Points:

    • Describe why high energy collisions are needed to produce elementary particles
    • Describe the range of subatomic particles in table 32.2
    • Describe what theories are being revised and proven via elementary particle experiments
    • Show how the quarks make up hadrons
    • Develop a grand unified theory for all 4 physical forces and win the Nobel Prize for Physics
    • Understand the EM spectrum
  • HW due Monday:  read chapter 28, sections 1-4; present 3 min PIML on elementary particles as assigned (linnea is gluon, nick is W boson); these will be graded using shown last week in blog.

    HW due Tuesday: How does MRI work? watch the first 3 videos.     your permission slip for the magnet tour is due to me.  Turn in contemporaneous video notes at end of NMR viewing.

    Wednesday: some ofyou taking  AP. English Lit, the rest, come to class

    Thursday: some of you taking Gov AP; the rest, come to class.

    HW due Friday: 

    HW due next Monday: do 32: Q-3; P 1,3,5,9,17  S&L 2  look at this short film:   and the making of. 

    Next Wed: play with this and find Plank length, strings, electron, quark, proton, etc. http://htwins.net/scale2/ 

    next week: the higgs boson explained: http://vimeo.com/41038445

    also next week: how the MRI works.

    TOUR

    points:

    • Chpt 28: sections 1-4.
    • Understand Thompson’s experiment using double slit for photons and electrons
    • State the Heisenberg uncertainty principle
    • State the Copenhagen interpretation:
    • Describe why high energy collisions are needed to produce elementary particles
    • Describe the range of subatomic particles in table 32.2
    • Develop a grand unified theory for all 4 physical forces and win the Nobel Prize for Physics
  • As I said, chapters 28 and 32 will be covered on the final exam and some on the second periodic exam this term.  To hone your skills in notetaking, I will not post the chapter powerpoint slides from these two chapters.  And your text does not cover the material as I do.  Thus, I recommend you take good notes in class.

    HW due Monday: 22 P-13,18,21 .and choose one frequency (in class) of the EM spectrum and research the applications of that frequency. Write one paragraph saying what application is it used for, find 4-5 blocks of frequency assigned to it, and how we might be affected by that use.

    Tuesday:  Bring a note from your parent/guardian indicating that they know of and approve of our field trip on May 18.

    HW due Wednesday: 22: Q-4, 5, 7, 8 P-11, 17, 23

    HW due Friday:  read hobson article

    HW due next Monday: read chapter 28, sections 1-4; present 3 min PIML on elementary particles as assigned (linnea is gluon, nick is W boson); these will be graded using criteria below.

    Fri: video: fundamentals and applications of EM waves http://www.cornell.edu/video/?videoID=228    watch from start to 26 min: this video is old, but it's very good. 

    Next week: start 32, the elementary particles

    Criteria for PIML on elementary particle as assigned in entry above.

    This is a prestudy assignment, so you will need to spend 15-30 minutes in reading to learn enough about the topic to teach it. It's too much delay to fire up a presentation for each one, so you have to present using the whiteboard or using handouts you prepare.

    Criteria: 5 pts each -- 5 for excellent, 4 for good, 3 for OK, 2 for weak, 1 for barely there, and 0 for not included.

    • a. introduction that puts the topic in perspective, so your mom or dad could understand it
    • b. indicate clearly what reference you used
    • c. give properties of your particle: mass, charge, spin
    • d. what does your particle do?  how does it interact with other fields or matter
    • e. when discovered
    • f. do we encounter this particle in our physics or our lives?

    Points for this week:

    1. Be able to fully describe qualitatively the propagation of EM waves
    2. Demonstrate that you know the 7 parts of the the EM spectrum, their order, and their applications
    3. know f λ = c and how c is constant
    4. Show that your can qualitatively and quantitatively explain and use these properties of the EM wave
      • energy
      • Intensity
      • momentum
      • pressure

  • Magnet Lab.  We are confirmed for May 18 and will be gone from 11:15-4pm.  You must notify teachers for any class you will miss.

    HW due Monday: 22: Q-1,2, 3; P-1, 3, 5, 9, 37.  Also, tell me who is presenting what on Tuesday.

    HW due Tue: your presentations for the Induction/transformer lab will be in class

    HW due Wednesday:  also work out the derivation for the Maxwell displacement current term in Ampere's Law, and be prepared to show us in class

    HW due Friday: 22: P-2,7, 10, 11  MCQ 1-8.  Skeptical Friday: look up and find when Maxwell's equations are wrong.  Write it down.  Show me.

    HW due next Monday: 22 P-13,18,21 .and choose one frequency (in class) of the EM spectrum and research the applications of that frequency. Write one paragraph saying what application is it used for, and how we might be affected by that use.

    Points for this week:

    • Be able to know everything there is to know about EM waves.
    • Show that you can walk on hot coals and balance a bowling ball on your head.
  • HW due Monday, read the Intro and Technology sections of this website:https://en.wikipedia.org/wiki/Hard_disk_drive  You will take apart a hard drive in class today.  Each person should identify 3 electro-magnetic components and explain how they work, use website for help

    HW due Tuesday:   Find a physlet that animates an EM wave in motion. (hint: google EM wave physlet) bring printout of image to class.  ALSO, Read the Wikipedia entry for Maxwell's equations up to the section titled "macroscopic formulation".  In this article, I expect you to build an appreciation for how mathematically complex the equations are -- this is the stuff of math majors and PhD's.  

    HW due Wednesday: practice problems for induction, handout and do problems 1-8 on this page (try to load the page well before the assignment is due so you can know it loads) http://wps.prenhall.com/esm_giancoli_physicsppa_6/17/4358/1115776.cw/index.html and select practice problems (not practice questions!) at left. You can check your work by clicking “submit” at the end. The input numbers will change each time you open the page. Bring the solutions for handing in.

    Thursday: Read up through page 95 in the Hawking chapter I passed out.  And watch this video in class to get ready for Maxwell's equations.     

     Friday:      there is no school !!!

    HW due next Monday: 22: Q-1,2, 3; P-1, 3, 5, 9, 37.  

    HW due next Wed: have you read up to page 95 in the Hawking chapter?  there will be a quiz.

    Points:

    • Understand and explain why scientists are driven to unification
    • Be able to restate each of Maxwell’s equations in practical terms
    • Tell me how these 4 equations summarize one year of physics II.

    And if you want to get a taste of what a sophomore or junior level physics course is like.....  R. Shankar is John Randolph Huffman Professor of Physics, Yale University. His popular Open Yale Course “Introduction to Physics” has a major following in the United States, India, Australia, China, and elsewhere. He is the 2009 winner of the American Physical Society's Lilienfeld Prize and the author of two previous textbooks, Principles of Quantum Mechanics and Basic Training in Mathematics: A Fitness Program for Science Students.

  • I've been watching this series of short comments by Richard Feynman, certainly the most famous quantum mechanic who lived.  It's called Physics is fun to imagine   check it out.  http://www.ted.com/talks/richard_feynman

    HW due Monday: 21: p45, 49--note, if the layer is thin on the sphere, then the volume is area x depth, 50,51, 81;  

    HW due Tuesday: Show me that the table data and calculations are complete for the transformer lab.  Remember that your formal report is due April 18.  

    quiz Wednesday on historical figures in E&M.  

    HW due Wednesday: describe with diagram and words how the following devices work: shake flashlight and GFI.   do problem Search&Learn #4, 5, p 624;    Also, turn in answer to paper-towel sensor: show your method and give your conclusion. Your writeup can be short, but it must be typed and complete.  Include in your answer: is it a capacitive sensor?   Give solid evidence supporting your idea, and you must test a range of dielectrics.

    HW due Thursday:  21: P-80, 83, 84, 85

    HW due Friday:  Exam 1 in class

    HW due next Monday, read the Intro and Technology sections of this website: https://en.wikipedia.org/wiki/Hard_disk_drive  You will take apart a hard drive in class on Monday.  Each person should identify 3 electro-magnetic components and explain how they work, use website for help

    Points:

    • Qualitatively understand the LR circuit
    • Quantitatively apply the LR equations to graphs
    • Describe how B-field production and induction are both involved in a transformer
  • HW due Monday: 21: p-39, 46, 47 ,79, 82 note: 46 has answer M=m0N1N2A/l;  .

    HW due Tuesday:   You will do the transformer lab in class on Tuesday and Wednesday, see the handout

    HW due Wednesday: Photograph and Map the circuit breaker box in your house or dorm.  Draw picture of all the breakers, including the Main switches, and identify the location of each circuit in your house.  Test at least one circuit by turning off the breaker.   CAUTION: if the cover panel hiding the wires has been removed, bring a photo but do not touch the panel.

    HW due Friday: you are to determine how the sensors in the paper towel dispensers work.  For today, show me data where you have tested at least 4 material interactions with teh sensor.   Do some internet research to see what kinds of sensors are typically used.  For Monday, you will make your conclusions.

    HW due next Monday:  21: p45, 49--note, if the layer is thin on the sphere, then the volume is area x depth, 50,51, 81; turn in answer to paper-towel sensor: show your method and give your conclusion. Your writeup can be short, but it must be typed and complete.  

    Points:

    • Describe induction and how a transformer relates to induction
    • Calculate inductance, energy in an inductor
    • Qualitatively understand the LR circuit
    • Quantitatively apply the LR equations to graphs
    • Schedule: we will cover all sections but %21-8, 12, 13, 14 and part of %21-6 (eddy brakes)
  •  

    This lightbulb built by Thomas Edison's early company is about 3 feet tall and produced 50,000 watts of power, much of it as heat, of course. 

    HW due Monday: 21: Q-18, Use this physlet Faraday’s Electromagnetic Lab (transformer) in AC mode to test quantitatively a) the effect of distance between coils, b) loop number on either coil, c) loop area on pickup coil, d) frequency, and e) amplitude of primary coil. http://phet.colorado.edu/en/simulation/faraday. Keep the coils coaxial, and for b, c, d, and e keep them nested as well (meaning the center of their axes are at the same point.)

    HW due Tuesday: none

    HW due Wednesday: 21: p-31, 37, 75 and do problems 60-70 on the LAST TWO PAGES from cmc98elec (see FILES)  

    HW due Friday:  no school

    HW due next Monday: 21: p-39, 46, 47 ,79, 82 note: 46 has answer M=m0N1N2A/l

    Schedule: we will cover all sections but %21-8, 12, 13, 14 and part of %21-6 (eddy brakes)

    Tue: demo rfid chips

    Wed: generators, %21-5, 7, power transmission

    Next week: introduce induction and magnetism lab

    • Points: I gives B, does B give I?
    • Describe how an alternator and generator work
    • Understand mutual inductance
    • Describe how a transformer works and use the transformer equation
    • Explain why higher voltage transmission is more efficient

  • Start of Term 3!

    Monday: review final exam; introduce lab 6

    Due Tuesday:    Your Lab plan.   Write neatly by hand the theory and logic for each experiment hypothesis.   Do this on your own.   You will each present to me in class.    This will be graded.

    Due Wednesday:  A refined Lab plan improved based on the discussion of Tuesday and factoring in prelim experiments you did.

    Due Thursday: read this lab to improve your lab, including the analysis. https://www.vernier.com/experiments/pwv/31/magnetic_field_of_a_permanent_magnet/ 

    Due Friday:  Each group will present to me an update on your progress and findings so far.   You should have calculations and graphs done on any data collected.  This must be neatly written by everyone in the group.

    due next Monday: 21: Q-18, Use this physlet Faraday’s Electromagnetic Lab (transformer) in AC mode to test quantitatively a) the effect of distance between coils, b) loop number on either coil, c) loop area on pickup coil, d) frequency, and e) amplitude of primary coil. http://phet.colorado.edu/en/simulation/faraday. Keep the coils coaxial, and for b, c, d, and e keep them nested as well (meaning the center of their axes are at the same point.)

    Points for this week:

    1. Demonstrate that you can design an experiment given the hypothesis and theory.
    2. Show that you can communicate that plan to me
    3. Show that you can work in a team to arrive at a experimental design and plan.
  • HW due Monday: no school

    HW due Tuesday: problems 4, 5, and 6 of the Hoover Dam problems

    Due Wednesday: minilab on magnet drop.  See slides for details.  This is the analysis section of a report.  Show clearly the following: 1.  Direction of current according to Lenz. 2. Find B for each curve and show derivation. 3.  Derive and find dB/dx for a given position of the magnet or a given position on the curve.  4. How to improve the lab.  Type text, and equations and sketch may be hand drawn neatly with ink.

    HW due Thursday: I spin a vertical circular 0.30m2 coil at 100. rad/s in a horizontal magnetic field of 0.50T.  The coil has R of 0.33 Ω and has a mass of 0.40kg.  a)  How much EMF is produced?  b) how much current is produced?   c)  how much electrical power is produced?   d) how much mechanical power is required?  e)  how much torque is required on the loop?  f)  how much work is done in 1.0 minute?   g)  could you power your smartphone during talk mode?  (note, you need to remember aspects of rototational motion)

    HW due Friday: do the assigned problems (38,39,40,41,49,50,52,53,54,55) from CMC98elec posted in files 

    HW due next Monday: bring to class exam 2 from this term, also view this video and explain why the droplets don't travel further up the knittin' needle

    Our goals this week:

    • introduce transformers and understand how they work
    • understand the main points for exam 2
    • be able to describe and use Faraday's Law and Lenz's law for simple geometries.

    Practice problems in class.

    1.  A square loop of length L, resistance R, mass M, is vertical and is lowered into a uniform horizontal field B at speed v; assume the loop is entering the field for each answer.  a) what EMF is induced?  b) what current? c)  what force is induced in the loop?  d)  If the loop is dropped freely, what terminal speed will finally be achieved?  e) how much heat will be generated as the loop enters the field completely?

    2.  Describe the path and kinematics of a proton shot at the following:  a)  an E field pointing down  b) a B field pointing down  c) a long wire with current pointing down d)  a RH solenoid with clockwise current pointing down  e)  a simple bar magnet with North pole down

  • HW due Monday:  21 : Q-6, 7,8,13, 14;  P-13, 14, 15, 17, 19 

    HW due Tuesday: I invented a gun that can shoot around a corner.  It shoots electrically charged bullets that take advantage of the earth's field.  I want it to curve at 10.0g bullet with a radius of 5.0 m when shot at 1000m/s.  How much charge must I put on the bullet, and where on the earth can I shoot it to curve to the right around a corner.

    HW due Wednesday: do "09 practice problems for exam 2" in FILES.  Also see the list of equations on this that will be on the exam.

    Due Thursday:  exam 2 in class

    HW due Friday:  no school  

    HW due next Monday: no school

    HW due next Tuesday: problems 4, 5, and 6 of the Hoover Dam problems

    Due next Wednesday: minilab on magnet drop.  See slides for details.  This is the analysis section of a report.  Show clearly the following: 1.  Direction of current according to Lenz. 2. Find B for each curve and show derivation. 3.  Derive and find dB/dx for a given position of the magnet or a given position on the curve.  4. How to improve the lab.  Type text, and equations and sketch may be hand drawn neatly with ink.

    Exam 2 is 16 Feb. It will cover chapter 20 and sections 1-2 of chapter 21.  The only study guide is the practice problems due Friday.

    Lab on induction and transformers: next week

    Schedule: we will cover all sections of chapter 21, but only part of 21-6 (I will do eddy brakes)

    Demos: RFID chip for function

    in class project on induction

    1. Give each group either a galvanometer and coil or speaker
    2. Give them 20 min to work out
      1. Identify mag fields with NS directions
    3. Explain how device works in terms of magnetic and currents. 
    4. Produce a sketch for hand in with names attached
    5. Present: person who contributes least to discussion in group will present for 3 min

    Physlets: PHET on induction

    • Points: I gives B, does B give I?
    • Know faraday’s law and Lenz’s law, be able to apply them to 5 main situations
    • Describe 4 ways to change magnetic flux
    • How does changing mag flux produce an electric field?
  • HW due Monday: 20,P-55,81, 84,91 Search and Learn-1,5 ; 3 practice problems in FILES  "physics II practice questions for chapter 20".  

    HW due Tuesday: 21: Q-1-4, P-1,3,5,9, 12

    HW due Wednesday: 21 Q 5; P-6,7,11 MCQ 2, 3.  there will be a quiz on wednesday.

    HW due Thursday: perform magnet drop minilab

    HW due Friday: Do #1 in Hoover Dam assignment in FILES. (you will have to read ahead for the simple transformer calculation.)  Study this physlet: (it will be quizzed) http://phet.colorado.edu/simulations/sims.php?sim=Faradays_Electromagnetic_Lab; Look at Pickup coil, Generator and Transformer tabs:

    HW due next Monday:   21 : Q-6, 7,8,13, 14;  P-13, 14, 15, 17, 19

    Schedule:  Exam 2 is 16 Feb. It will cover chapter 20 and sections 1-2 of chapter 21.  The only study guide is the practice problems due Tuesday.

    Demos: RFID chip for function, flashlight, toothbrush; in class project on induction

    1. Give each group a device
    2. .Give them 20 min to work out .....
      1. Identify mag fields with NS directions
      2. Explain how device works in terms of magnetic and currents, show equation
      3. .Produce a sketch to turn in with names attached
    3. Present: person who contributes least to discussion in group will present for 3 min

    Points:

    1.Calculate induction for simple systems using faraday’s law

  • Keep your eyes open for summer STEM camps at the universities.  They start coming out in February.

    We have an exam on 16 Feb.   Are any of you on the showchoir tour?  If so, talk to me and plan to take the exam early.

    HW due Monday: 20: Q-16, 17,18 P-38, 49, 54

    HW due Wednesday: presentations on Lab (force and a wire.)  see handout, with the following additions of 26 Jan: 1. Linnea group: why isn't internal agmt good? 2. all: if L is off by 1mm, what error will propagate to B?  Can this account for internal or external disagreements with B?  3. Darran and Alejandro groups: why is there external disagreement between you?  4.  all: discuss the VOM accuracy and its effect on your results.

    HW due Thursday:  

    HW due Friday:  20: Q-19, 20,21,P-53, 64,73  And report on your in-class exploration 

    HW due next Monday: 20: P-55,81,84,91 Search and Learn-1,5 ; 3 practice problems in FILES  "physics II practice questions for chapter 20".  

    Physlets:http://phet.colorado.edu/simulations/sims.php?sim=Faradays_Law

    Points:

    1. Show how to use Ampere’s law to find B in a torus
    2. Demonstrate how torque on a current loop is derived
    3. Be able to describe the motor and voltmeter applications of torque loops
    4. demonstrate all the calculations necessary for the lab
  • HW due Monday: 20: P-69, 71, 60 and any that you've fallen behind on in Chapter 20.

    HW due Tuesday: exam 1 in class.

    HW due Thursday: show me your analysis of the lab data; you should calculate B values for each run.  Create a table in Excel for all your calculations.  Each person should build their own table.

    HW due Friday:  20: Q-13, 15, P-15, 17, 31

    HW due next Monday: 20: Q-16,18 P-38, 49, 54

    Schedule:

    Fri: demos (wire and battery); 20-8, 20-9

    Physletshttp://phet.colorado.edu/simulations/sims.php?sim=Faradays_Law

    Points:

    1. show how magnetic forces affect a loop of current in a B field.

    2. master the topics of magnetism with the HW

  • HW due Tuesday:  http://phet.colorado.edu/en/simulation/magnet-and-compass  be able to describe planet earth’s magnetic field, including declination. Check all the boxes at right in physlet for best demo. bring printout of physlet.  Why is field stronger at the poles?

    HW due Wednesday: Write the equations and analysis needed to complete the lab on magnetic force and a wire, this should be 1/2 page of notes and equations; each person to present prelab. For prelab discussion: be prepared, bring notes and all lab materials. Your grade will be based on ability to answer questions about the lab. In 2 minutes, you will explain to me what you will do in the lab and for analysis.  If you haven’t prepared well, I will stop the discussion and you’ll have to find me later.   Also, if you haven’t prepared for this, then you will not be part of the lab on 21 January– you will have to do it some other time on your own.

    HW due Thursday:  Lab "Magnetic force on a wire" in class.  If you can't do your lab in this class, all members of the group must find time to do it together by Tuesday.  Groups will be assembled on Wednesday, depending on who is ready.

    HW due Friday:   20: P-9,11,13,27, 29, 33 

    HW due next Monday: 20: P-69, 71, 60 and any that you've fallen behind on in Chapter 20.

    next Tuesday:  exam 1, chapter 19 and up through section 20-5.

    Points / learning goals for this week.

    • 1. solve problems for a moving charge in a field or a current wire in a field
    • 2. describe and quantify a field around a current wire
    • 3. describe and quantify the forces between current carrying wires
    • 4. understand the lab for wire in a field, and be able to conduct all portions
  • HW due Monday:   Make sure you have read Chapter 20 sections 1-5; this will all be on the next exam.  Do Problems 20: P-1-5  Perform deflection of an electron beam parallel and perpendular to the Earth's B field.  Record method and data in class.  Minilab writeup is due Wednesday.

    HW due Tuesday: 20: Q-6-12; P-7, 8, 9,11,12, 13, 25

    HW due Wednesday:  Minilab on CRT in a solenoid is due in class.  Predict and compare the distance of deflection in the CRT (you have data, and assume path length of electron inside the CRT tube is 11.cm), and show in a sketch that the deflection was in the correct direction.  Refer to your notes that you should have taken.

    HW due Thursday:   I'll hand out the next lab on current carrying wire in a B field.  Does anyone want to demo the force on the wire antique.  Let's learn how to find the voltage of a USB charger

    HW due Friday: Solve this practice problem: I am standing with a compass held horizontally.  3.0 m West of me is a long horizontal wire pointing straight South.  What current in the wire will produce a field of 0.5G where I am?  If I do produce that field with that current, will it affect my compass?  Show the diagram!  

    HW due next Tuesday:  http://phet.colorado.edu/en/simulation/magnet-and-compass  be able to describe planet earth’s magnetic field, including declination. Check all the boxes at right in physlet for best demo. bring printout of physlet.  Why is field stronger at the poles?

    HW due next Wednesday:
    Write the equations and analysis needed to complete the lab on magnetic force and a wire, this should be 1/2 page of text and equations.

    Schedule

    Review in the lab the key themes so far in electricity and magnetics

    Thursday: introduce Lab: Magnetic force on a wire

    handout on Ampere’s Law and Magnetic Permeability

    study guide for exam 1: 90 pts.  know RC circuits (charge and discharge), graphs of them, how and why capacitors behave as they do, electrical safety (again!), simple magnetism concepts (field lines, earth, attraction), and magnetic field from a straight wire (magnitude and direction)

  • Welcome back, and welcome to 2016.   156 years since Maxwell published his major work on E&M.

    Due Tuesday: 20: Q-1,2,3; bring VOM to class.  We are starting chapter 20 so please read some during break;   

    HW due Wednesday: Plot V and I vs t for this circuit: a 1500V battery is powering a circuit of a 2500mF capacitor and a 5.00kΩ resistor.   

    HW due Thursday: 20: Q-4-8.  Battery resistance lab--you are going to design and conduct.  Given a battery, how will you determine its internal resistance experimentally, using only one or two VOMs and a resistor?  You will have 25 minutes to work on this  ; Find the internal resistance for each of 2 batteries.  Your results are due by the end of class.  Hand in your data, a circuit sketch, and a table showing battery type, V, I, R and r for each.

    HW due Friday: Study this PHET http://phet.colorado.edu/en/simulation/magnets-and-electromagnets ; how many revolutions does the compass make as it is moved completely around the magnet; and be prepared to answer other questions using this app.

    HW due next Monday   Read Chapter 20 sections 1-5.  Prob 20: P-1-5      

     we will Build a homopolar motor in class

    goals for this week:

    1. know what a magnet is, know how the earth is magnetic
    2. show how a current can cause a magnetic field (a moving charge causes a field)
    3. show how a charge moving in a field has a force on it. (a moving charge causes a field!)
    4. revitalize your learning of mechanics so you can explain the physics of car crashes
  • HW due Monday:  (for15 points) The RC Lab report is due. RC lab (see assignment sheet): analyze the data you collect on the black capacitor and your group's resistor; calculate R and C as we did in class, and then measure R using your VOM and read the C of the capacitor, and turn in one page report; which includes name, date, lab title, analysis section + circuit diagram.  Include your Loggerpro data with any line fits you use in the report.

    Due Tuesday:  Kirchhoff practicum in class, due Thursday.   I will build a simple circuit.  You will, as a group, measure V across each resistor, and all currents, using your VOM.  I will assign a person to measure one item, so you need to be ready to use your VOM in this task.  Then, for Thursday, you will show me a schematic of the circuit, each measured value, and using the measured R and V, calculate the I values.  Compare the calculated I to the measured I values.

             this actually works.  Can you explain how?      .

    Due Wednesday: 19: p-21, 22, 58,86, 89  I gave you a new RC circuit to solve; prepare plots of V and I; Count how many GFI outlets are in your home.  Test one by turning it off and verify what part of the house was affected. 

    Due Thursday:  19: P-87,   Kirchhoff circuit lab report.   I need a clean and large schematic diagram of the circuit, with labels on each element, and also show the table of R, V, Imeas, IKirch, %diff (of I) for each resistor.

    Due Friday:  Bring your phone or tablet to class and make sure it has a compass app loaded.   We do have class.  Let's do a fun demo or lab.  Have you heard of Magnetoman?

    Due next year, 3 January 2016, Monday: 20: Q-1,2,3; bring VOM to class.  We are starting chapter 20 so please read some during break

    Friday: view video of manufacturing flash memory cards: 

  • HW due Monday: show the calculations of the in-class lab where you determine ε, Io, R, τ, and C using only the data we produced in class.  That data is what I handed to you in class.  

         19: Q-15, 16; P-19, 70.  and in problem 81,  replace the 85 ohm resistor with a 25mF capacitor.  Write the complete V and I curves for the capacitor and both resistors.

    HW due Tuesday:   19: Q-18, 20; P-52, 55;  design and sketch a circuit with τ = 1.0 s ; today, Dec 6, is the 229th anniversary of which invention?
               Two groups will do the RC lab.  You will have 20 minutes on the apparatus, so I'm counting on you to know the procedure.

    HW due Wednesday:  COLLEGE VISIT DAY 2016 FOR 11TH GRADE        

    HW due Thursday: 19: P-51, 74, 93, 95.  

    HW due Friday:  show me the R and C calculations and results for your lab.   quiz on safety

    HW due next Monday:   (for15 points) The RC Lab report is due. RC lab (see assignment sheet), ,   Include your Loggerpro data with any line fits you use in the report.

    Schedule: 

    Mon: review your RC minilab data and continue RC circuits
    Tue:  safety/hazards
    Wed: safety
    Thurs: summary, problems, and practice for chapter 19
    Friday: problems, quiz on hazards and safety

    Points for this week:

    • Know and be able to list the risks associated with electricity.
    • Know and recite the safety rules for the lab
    • Master the V and I graphs for RC circuits; be able to draw for 3 types of RC circuits
  • Wecome to Term 2, where we get to learn magnetism!

    HW due Monday: none

    HW due Tuesday:  read section 19-6; do 19: Q-17, P-49, 50, MCQ 8, 9, 10, 11

    Wednesdayfor a simple RC circuit of 1.0 V and 1.0 Ω and 1.0F, plot Vcapacitor for up to 5s;

    HW Due Thursday:  19: P-72;  Look at Figure 19-48, replace the 990Ω resistor with a 2.0mF capacitor, and calculate the equivalent R of the remaining two resistors, and then plot V vs. t for the capacitor for up to 5τ;  do RC minilab in class.

    HW due Friday:  19: P-69, 73 
    And use your VOM to measure the current from the batteries in a battery-powered device, such as your calculator. Report the I, V, and power of the device. 

    [Open-note quiz on capacitors and RC circuits.]

    HW due next Monday:  Part 1 of the RC lab is due: what is R and C for those data and show how you obtained it.  19: Q-15, 16; P-19, 70, 93, in problem 81,  replace the 85ohm resistor with a 25mF capacitor.  Write the complete V and I curves for the capacitor and both resistors.

    Points for this week:

    • Know the risks associated with electricity.
    • Know the safety rules.
    • Master the V and I graphs for RC circuits.
  • HW due Monday:bring your two Term 1 exams to class. write classic problems for chapter 17. Our quiz will be on a simple circuit where you have to decide to use Kirchhoff or just Ohm's Law.  For practice, do 3 problems you find in the Powerpoint slides at the end of the chapters.

    On Monday, we'll review principles of our labs and look at capacitor circuits

    HW due Tuesday: Answer these questions.

    1. There is a copper cylinder with a net negative charge.   Draw an end view of the cylinder showing 8 E-field lines and 6 isopotential lines wherever they would exist.

    2. A transmission line carries electricity from the power plant to the factory.  Explain in words why power losses in the transmission line are decreased when the transmission voltage is increased.

    3. We have found there is a voltage drop and a power loss across a resistor in a circuit.  Where do those volts go?  Where does the power go?

    4.  Draw the circuit you used in the Ohm's Law lab.  If the red and black wires you used had significant resistance, would this give you an error in the measurement of R of the object being tested?  If so, would that make R higher or lower than it should be?

    5.  A capacitor with a dielectric has C=33.3 mF and is charged to 444V.  The dielectric is removed by slowly pulling it away.  How much work was required to pull the dielectric?

    6.  I have five 15W (nominal) light bulbs that normally operate at 12V.  I connect them in series.  How many total Watts do they produce?

  • http://answers.yahoo.com/question/index?qid=20081110232651AAiR2nS

    is a handy and quick solution for solver in the TI-89; it gives the example below.

    2x+3y+10z=28
    3x+2y+4z=16
    x+9y+2z=11

    1.) [2nd] custom, or until the f1 on the toolbar is "var"
    2.) f3
    3.) 4
    4.) solve( and , {x,y}) should appear
    5.) type in the following
    solve(2x+3y+10z=28 and 3x+2y+4x=16 and x+9y+2z=11, {x,y,z})
    6.) enter

    The answers are: x=2, y=0.5, z=2.25

  • HW due Monday: Exam 2 in class.  Study guide is posted in FILES.

    HW due Tuesday: bring all data from the lab, with all analysis done as required by the lab.

    HW due Wednesday: 19: P-78,81,82,83 

    HW due Thursday: bring your completed Table of the lab data as we discussed in class. 

    HW due Friday:  Bring a list of classic problems for chapters 16

    HW due next Monday: bring your two Term 1 exams to class. write classic problems for chapter 17. Our quiz will be on a simple circuit where you have to decide to use Kirchhoff or just Ohm's Law.  For practice, do 3 problems you find in the Powerpoint slides at the end of the chapters.

    Note: I've moved the lab report for Ohm's law to 14 Nov in class.

    Final exam:  Friday, 21 Nov .  It goes up through section 19.2.  

    A study will be handed out Wednesday 

  • http://what-if.xkcd.com/16/ is a little Q&A about lightning.  You are becoming experts on lightning, so here's some interesting info.

    HW due Monday: 19: Q-7,  P-1, 4,5, 7, 9, 13, ; Be prepared to explain the Ohm's Law lab that I handed out and that is found in FILES  

    Tuesday: bring your written hypothesis for the lab.  We will start the lab in class in order of who is prepared by my questions.

                                   Lab groups are:  np; ld; ia; tj; bo

    HW due Wednesday:  more groups will perform the Ohm's Law lab in class.  If you can't get done today, you'll need to schedule.

    HW due Thursday: 19:  Q-10,11   P-15, 31, 19, 29, 33  Bring VOM for a practicum in class.

    HW due Friday: we will review in class and practice for the exam

    HW due next Monday: Exam 2 in class.  Study guide is posted in FILES.

    HW due next Tuesday: bring all data from the lab, with all analysis done as required by the lab.

    goals for this week: 

    • show how to solve simple circuit problems with resistors and power source
    • apply kirchhoff rules to solving more complex circuits with multiple power sources
  • Remember to turn in HW when it is due.  

    HW due Monday: 18: Q-14,15,17,16; P-34,35,37,38,64,69

    Due Tuesday: calculate R (for two lengths), P at burnout, and ρ for nichrome wire from demo on Monday

    HW due Wednesday; 18: P-55, 77, 80

    Due Thursday: by 4:00 today, if you want to do corrections for your lab, first plan to see me by 4:00 today, and then your rewrite is due Monday.

    HW due Friday: We will have a quiz on Ohms Law and Power in a lightbulb.  And do these for homework: 19: Q-1, 2, 3, 4, 6  MCQ: 1

    HW due next Monday: 19: Q-7,  P-1, 4,5, 7, 9, 13, ; StudyOhm's Law lab found in FILES and handed out.

    goals for this week

    1. show how to solve power problems for simple devices in a circuit
    2. show how to solve power problems for transmission from generator/source to user over a wire
    3. derive a short list of classic problems for chapter 18
    4. show that you can measure resistance, current, and voltage with your VOM

  • http://www.jpl.nasa.gov/news/news.php?feature=4340 is about a moon of saturn that holds a static charge.  How does it get charged?

    HW due Monday: Capacitor Lab is due.   Bring your VOM to class.  This is now part of required materials. 

    Due Tuesday: 18: Q-7,8, 9,10,11; P-23, 27, 29, 31,33

    Due Wednesday:  PSAT in a.m., so enjoy your test.

    HW due next Monday: 18: Q-14,15,17,16; P-34,35,37,38,64,69;               

    Due next Tuesday: calculate R (for two lengths), P at burnout, and ρ for nichrome wire from demo
    by 3:45 today, if you want to do corrections for your lab, write them and then plan 5 min discussing them with me.

    Goals for this week

    •   Understand the parallel of electrical flow and water flow
    •   Be able to describe that V is the potential for work, and I represents real energy expenditure
    •    Show ability to use I = V/R, P=IR
    • Be able to set up a power-loss problem in transmission lines.
  • HW due Monday: 18: Q-1,2,3,4,5; MCQ-1,3,4,5; P-1,3,5  Look at this physlet: http://phet.colorado.edu/en/simulation/capacitor-lab

    HW due Tuesday: 17: P-85, 88, 93 (hint: find the travel time between plates first); also have your data for the lab plotted (each person should have the data and the plots).

    Wed:  none

    NOTE;  I have attached in files an example of the analysis section for the lab.  You cannot cut and paste this section, but you are free to borrow equations and ideas from it.  I expect you to rewrite your own sentences.

    HW due thursday: . How many will be gone for Spanish trip?    Do these problems below.

    x1: A capacitor of 25mF is charged to 444V.   It is connected to an identical capacitor.  What is the new voltage on each?  They are then disconnected.  What is the final voltage on each.

    x2: A Leyden Jar of capacitance C is connect to a battery with potential V.  It is disconnected from the battery, and then connected to another jar of capacitance 3C.  a. What charge is on each jar?  b. What potential is on each jar?

    x3: A variable capacitor is charged with a given potential.  a. What is this initial charge?  the capacitance is then quadrupled.  b. What is the new charge?  c. what is the new potential?

    Due Friday:   18: Q-6, P-7, 9, 11, 13; Look at physlet for Ohms Law: bring printout of lowest and highest current possible on it.http://phet.colorado.edu/en/simulation/ohms-law 

    HW due next Monday: Capacitor Lab is due.   Bring your VOM to class.  This is now part of required materials.  

    Goals for this week

    • Show that electrical current, I, is an outgrowth of charge and time.  
    • Understand the parallel of electrical flow and water flow
    •   Be able to describe that V is the potential for work, and I (current) represents real energy expenditure
    •    Show ability to use I = V/R
  • HW due Monday:exam 1 in class.

    due TUESDAY: 17:q-11, 12; P-68,69,71,73,74,77 (be sure to consider all positions on the line).    Capacitor lab and handling this equipment.  We will measure an aliquot and introduce the capacitor lab.

    Wednesday:  Design a capacitor to hold 1.0pC using only a AA battery and aluminum foil and a sheet of paper, report area and separation.     There will be a quiz on the capacitor lab; make sure you've read it.

    HW due Thursday: Two groups will perform lab in class .  Your prelab is due today.

    • This HW you will work on when not doing the lab these two days.
    • 17: P-45, Search&Learn (S&L) p 500: #3 on lightning; and read 18 sections 1-3,
    • show problem 77 a and b using the physlet below, sketch on printout the elevation of the potential as we did in class, bring printout to class;    then do the same for two equal negative charges, bring printout.
    • http://vnatsci.ltu.edu/s_schneider/physlets/main/equipotentials.shtml

    HW due Friday: Two more grousp will work on the lab, and others will review HW and lab analysis.  bring your computers if you want to work on your lab.

    HW due next Monday: 18: Q-1,2,3,4,5; MCQ-1,3,4,5; P-1,3,5  Look at this physlet: http://phet.colorado.edu/en/simulation/capacitor-lab

  • some thoughts about repulsive charges:   http://what-if.xkcd.com/140/

    HW due Monday: 17:P-15, 17, 19, 21, 23, 25 use this physlet to test if you can put the test charge into orbit around a single or multiple negative charges, or can you make the test charge hover in one place?.  (double click to create new equipotential lines) bring in a printout  http://vnatsci.ltu.edu/s_schneider/physlets/main/equipotentials.shtml    If you're really good, you can show that the particle bounces between the same value potential lines.

    HW due Tuesday:  17: Q-10,18; P-35, 37

    HW due Wed     17: P-39, 43, 49, 53, 57    (you will make a capacitor in class)

    HW Thurs: quiz on HW from chapter 17

    HW due Friday: Do chapter 16 MCQ 1-13 (all of them).  Is there a rewrite on the pith ball lab?

    HW due next Monday:exam 1 in class.

    NEXT TUESDAY: 17:q-11, 12; P-68,69,71,73,74,77 (be sure to consider all positions on the line)

    x1. Design a capacitor to hold 1.0nC using only a AA battery and aluminum foil, report area and separation.

    next Friday: demo day with you teaching.  you will each have a classic from chapter 17 to present.

    Next week: capacitor lab introduced.

    goals for this week:

    1. describe how a capacitor works
    2. design a capacitor of a given C by adjusting d and A
    3. be able to describe the role and effect of dielectric materials in a capacitor
    4. be able to describe 6 fundamentals of lightning
    5. describe the energy stored in an electric field and quantify it.
  • NOTE: for the exam in two weeks, you need to recall that F=GMm/r2 and how it is applied.  You don't need to memorize the value of G.

    HW due Monday: Gauss's Law: 16: 39, 41,43, 47.  Also, show that Coulomb's Law E=kQ/r2 can be derived from Gauss's Law. -- Recall that k = 1/(4πeo)  YES, we did this in class, so if your notes are neat and legible, show me that.  If not, then write it pretty.  

    HW due Wednesday: 16: Q-22 and P-67. chapter 17: MCQ-1,2,3,4,5,6; p-8, 13  and you didn't show me this, so be prepared.   use this physlet to prove that Work=0 if you move along an equipotential line for any of the Charge Configurations; bring printed page --  http://vnatsci.ltu.edu/s_schneider/physlets/main/equipotentials.shtml

    Thursday quiz: I will repeat the demo where we measured the static charge on an everyday object; you will report the electrons lost per second. Also, given the inital charge, you will calculate properties of field or potential as equations 16-4a or 17-5.

    HW due Friday:  17: Q:6,7,8,9; write each of chapter 16 classic problems on a page and make a diagram for each.   Slides for both 16 and 17 will be posted.

    HW due next Monday: 17:P-15, 17, 19, 21, 23, 25 use this physlet to test if you can put the test charge into orbit around a single or multiple negative charges, or can you make the test charge hover in one place?.  (double click to create new equipotential lines) bring in a printout  http://vnatsci.ltu.edu/s_schneider/physlets/main/equipotentials.shtml

    If you're really good, you can show that the particle bounces between the same value potential lines.

    points.

    • Be able to describe lightning with physics of charge, induction, and ionization
    • Name and sketch the 10 main problems for the exam.
    • Sketch what happens to an insulator in an E field
    • Show how to quantify V from a point charge in space
  • HW due Monday:  
    17: Q-1-5; P-1,3,5,7,11;   use this physlet to prove that Work=0 if you move along an equipotential line for any of the Charge Configurations; bring printed page --  http://vnatsci.ltu.edu/s_schneider/physlets/main/equipotentials.shtml 

    Also show your Excel table calculation results for the pith ball minilab.

    HW due Tuesday:  draw E-field lines and equipotential lines for each of these:  1).  2 equal positive point charges  2).  2 positive point charges of 1 and 3 q each  3)  a triangle with a negative point charge at each vertex.   4)  a very long line of charge

    HW due Wednesday: An equilateral triangle with sides of 2.0m has a point charge of +1mC at each apex.  a) carefully draw the E field lines and isopotential lines.  b) what is E at the center of the triangle?  c) what is V at the center?

    Quiz Thursday. on Coulomb's law problems in 1 or 2 dimensions.

    HW due Thursday:   Pith ball calculation due, will be handed in. Derive the equation symbolically for Q of the large chrome ball (describe the steps), and then show the calculation (fishbone style) with the answer.  Include a careful drawing (use a straight-edge).

    HW due Friday  17: P-2,4,6,10.

    HW due next Monday: Gauss's Law: 16: 39, 41,43,47.  Also, show that Coulomb's Law E=kQ/r2 can be derived from Gauss's Law.  (Recall that k = 1/(4πεo)

    Points:

    • Understand Gauss's law, and use it to derive Coulomb's Law for a point charge
    • Be able to describe lightning with physics of charge, induction, and ionization
    • Sketch field lines for 5 basic cases of charge
    • Relate electric potential to gravity potential
    • Relate V to E
    • Relate equipotential lines to contour (topo) map
  • Monday: Labor Day holiday; Labor is Work = Fd, so Happy Fd Day

    HW due Tuesday: read 16.7, 16.8; Q-13,14,15; P-23,25,27,29,33  

    quiz Tuesday : on Coulomb's Law and forces, memorize the value of k

    HW due Wed: 16: p-17a, 31, 57, 32, 41, 55; and Faraday cage lab memo report  

    HW Due Thursday: using http://vnatsci.ltu.edu/s_schneider/physlets/main/equipotentials.shtml this link, find all positions in all 7 Charge Configurations where the E field is zero.  Be prepared to show the class.

    Cancelled: We will conduct the pith ball minilab on thursday in class.

    HW due Friday:  16: p-11, 26, 62 (use kinematics and F) Show for pith mini-lab the relation between q, Q, and distance of separation. 

    HW due next Monday:  
    17: Q-1-5; P-1,3,5,7,11;   use this physlet to prove that Work=0 if you move along an equipotential line for any of the Charge Configurations; bring printed page --  http://vnatsci.ltu.edu/s_schneider/physlets/main/equipotentials.shtml  .

    HW due next Thursday:   Pith ball calculation due. Include a sketch, of course.   Also due is rewrite of the Faraday Cage lab.

    Points:

    1. Be able to describe lightning with physics of charge, induction, and ionization
    2. Sketch field lines for 5 basic cases of charge
    3. Relate electric potential to gravity potential
    4. Relate V to E
    5. Relate equipotential lines to contour (topo) map

  • For Monday: 16: Q-1, 2, 3, 4,6; summary of scotch tape static; getting to know the static charge physlets, see below.   (your HW for Monday is to open each site and make sure you can run the physlets and show me a printout (not hand-drawn) of each of them.)

            http://phet.colorado.edu/en/simulations/category/physics is the site where you can find most of the physlets we'll use in class. You can select "electricity, magnets, and circuits" to get a shorter list. We'll look at "electric field of Dreams" and "electric hockey" first. Play with these each for about 5 minutes.

            http://webphysics.davidson.edu/physlet_resources/bu_semester2/index.html. this is another useful page, look at the "electric field" list and open "field lines and field vectors".  This one will require you use IE or Firefox.

    Another good link for static charges.http://vnatsci.ltu.edu/s_schneider/physlets/main/efield.shtml.

    (IMPORTANT NOTE: MANY TIMES, IF AN APP OR PHYSLET DOESN'T RUN ON A COMPUTER, IT IS PROBABLY THE FAULT OF THE WEB BROWSER YOU ARE USING.  SO IF CHROME DOESN'T WORK, TRY INTERNET EXPLORER.  IT IS YOUR RESPONSIBILITY TO FIGURE OUT HOW TO WORK THESE PROGRAMS.)

    Tuesday: lab experiment on air flow over an object in the faraday cage.  look at negative charge (?) and positive charge (balloon)

    HW due Wed: 16: Q-7,8 P-1,2,3, 5, 7, 9

    NOTE DELAY: HW due Friday: (draft of) the memo report on static charge loss.  Please see example file at top for a rough outline of such a report.  You need to provide more details of course than I did, but it should all fit on one page (typed, single space, with figure and table)

    HW Friday: 16: Q-9, 10, 11; P-13, 15

    HW due next tuesday: read 16.7, 16.8; do 16: Q-13,14,15; P-23,25,27,29,33 

    quiz next Tuesday : on Coulomb's Law and forces

    Points:

    • Describe when induction will occur and its effects (on conductors and insulators)
    • Describe conduction and induction cases for electroscope practicum
    • Be able to do simple coulomb’s law calculations
    • Be able to apply vector math to do 2-D coulomb’s law problems
    • Know that Coulomb’s law is complete for electrostatics, not complete for electrodynamics
  • You are using a computer and the internet right now and so you are using over 100 phenomena from the physics of electricity and magnetism. We will learn about dozens of those phenomena this year. It is an amazing story.

    HW Tue: summarize the Demo of Charge you did on monday, including a sketch.  Show clearly where the electrons moved.

    HW Wed:  hand in lab notes from electron transfer activity in class on Tuesday.  Include a short description of the set up.  You should report how many electrons are lost per second.  It will be a big number.

    HW Thurs-Friday: none = retreat

    For next Monday: 16: Q-1, 2, 3, 4,6; summary of scotch tape static; getting to know the static charge physlets, see below.   (your HW for Monday is to open each site and make sure you can run the physlets and show me a printout (not hand-drawn) of each of them.)

            http://phet.colorado.edu/en/simulations/category/physics is the site where you can find most of the physlets we'll use in class. You can select "electricity, magnets, and circuits" to get a shorter list. We'll look at "electric field of Dreams" and "electric hockey" first. Play with these each for about 5 minutes.

            http://webphysics.davidson.edu/physlet_resources/bu_semester2/index.html. this is another useful page, look at the "electric field" list and open "field lines and field vectors".  This one will require you use IE or Firefox.

    Points:

    • know what is difference between doing science and studying science
    • Differentiate science and authority-based systems
    • Be able to define/organize the scope of Phys II vs Phys I
    • Be able to generate positive and negative static charge
    • Be able to draw the topics map and fit in electricity
    • Define and characterize charge

  • This is our official class website, just like last year. Please look at it weekly to see assignments, advice, reminders, clues, cartoons, and notices.
    You should always check here before you start your HW assignment, and you can subscribe so you'll get an email when I update it.
    Physics can explain so much, such as what would happen if I pitched a baseball at 90% the speed of light (see here for the answer