Use the following schedule for the problem sheet Mon 1-4.; Tue 5 - 9; Wed 10 -14; Thur 15-19
Waveandsoundprob.doc
Also do this for 15 extra credit points ( make sure you mark it extra credit when you turn it in
StandingWavesworksheet22-08.doc
Friday, February 29, 2008
Thursday, February 28, 2008
Sunday, February 24, 2008
Honors New Unit Schedule
Here is the schedule for our continuing study of waves, including sound.
HonUnit9aResonsound08.doc
DopplerEffectTotal.doc
HonUnit9aResonsound08.doc
DopplerEffectTotal.doc
Revised AP Schedules
[First revision: Schedule 12 has been revised to reflect HSPAs, sort of.]
The Unit 10 quiz will be on Tuesday. Here are new schedules and worksheets. Note this Monday's lesson and homework on Unit 11 Schedule. I hope posting the schedules etc. this early will allow Nicole to proof read them before any mistakes or omissions hurt your work output.
The Unit 10 quiz will be on Tuesday. Here are new schedules and worksheets. Note this Monday's lesson and homework on Unit 11 Schedule. I hope posting the schedules etc. this early will allow Nicole to proof read them before any mistakes or omissions hurt your work output.
Honors Quiz and tomorrow's schedule
The quiz scheduled for Friday will be given on Tuesday. Monday, we will discuss standing waves which show the relationship between wave speed and wavelength very well. You will need to review wave speed to get the most out of this. We will also allow presentations of one group in each class. E mail me if you want to present tomorrow and have already been approved to do so.
Saturday, February 23, 2008
Simple Harmonic Lab Honors 2
I have received the Simple Harmonic Lab from: Amanda, Trisha, Brian, Zach, and Julia. The rest of you, except those who were absent are late. If it isn't in on Monday you will receive a zero, permanently.
Friday, February 22, 2008
Simple Harmonic Lab
I am still amazed by the lab reports I receive for this lab so I am posting a sample for you to peruse, not copy. Note, the springs were stronger when I developed this data.
SampleSimHarmMotLab08.doc
SampleSimHarmMotLab08.doc
Wednesday, February 20, 2008
AP Schedule
Lets pick up the pace a bit. Look over all the remaining assignments on this unit and see if there is anything you cannot do. Tomorrow, come in with any questions you have on the homework, and I will move along to the next topic. If you folks are confident, we can move the quiz up. In either case, I will start on new material before Tuesday.
Saturday Science Program
Columbia University runs a great program on sciences on Saturdays during the school year. If you are interested, see me.
Mathematical Quiz
There really will be a quiz on oscillators and pendulums tomorrow. Know about omega and energy in spring oscillators and pendulums ( really pendula)
All Students: Slopes and other lab problems
1) A slope of a linear graph is a single number! It is found by:
drawing the best fit line through the data
then using this line find the numerator by the subtracting the vertical coordinate of initial point on the line from the vertical coordinate of the final point.
Then find the denominator by subtracting the horizontal coordinate of the intial point from the horizontal coordinate of the final point.
When you divide the numerator by the denominator you have the slope one single value.
It is this single value you should use in the equations described in my lab instructions to you and in the post of 2/18 on labs
2) Focus on the purpose. We are usually trying to prove somethingwe derived or developed from observations is correct. Examples: Does a = F/m?; does a centripetal = omega squared r?; do relative velocities add? ; does omega really equal square root ( k/m)
For the Ferryman lab: purpose was to show that relative velocities of A to B and B to C are added to find velocity of A relative to C. In this lab, A to B was boat relative to ( as seen from the pooint of view of the) river, B to C was water relative to shore. Most of you focused on the details and missed the purpose.
drawing the best fit line through the data
then using this line find the numerator by the subtracting the vertical coordinate of initial point on the line from the vertical coordinate of the final point.
Then find the denominator by subtracting the horizontal coordinate of the intial point from the horizontal coordinate of the final point.
When you divide the numerator by the denominator you have the slope one single value.
It is this single value you should use in the equations described in my lab instructions to you and in the post of 2/18 on labs
2) Focus on the purpose. We are usually trying to prove somethingwe derived or developed from observations is correct. Examples: Does a = F/m?; does a centripetal = omega squared r?; do relative velocities add? ; does omega really equal square root ( k/m)
For the Ferryman lab: purpose was to show that relative velocities of A to B and B to C are added to find velocity of A relative to C. In this lab, A to B was boat relative to ( as seen from the pooint of view of the) river, B to C was water relative to shore. Most of you focused on the details and missed the purpose.
Tuesday, February 19, 2008
Quizzes
Honors quiz tomorrow ( brief one) on wave speed and Friday (pretty thorough) on waves and oscillations. We will finish the wave lab tomorrow so read through it tonight so we can move fast.
Mathematical quiz tomorrow on oscillations and pendulum, so we can start on waves. Longer quiz including waves on Tuesday.
AP thorough quiz on forces, fields, charges, conductors and insulators Tuesday.
Come in for help whenever you do not understand something, its so much better than going over a poor test result.
Mathematical quiz tomorrow on oscillations and pendulum, so we can start on waves. Longer quiz including waves on Tuesday.
AP thorough quiz on forces, fields, charges, conductors and insulators Tuesday.
Come in for help whenever you do not understand something, its so much better than going over a poor test result.
Honors Homework
The AP worksheet 1 called for on your schedule for Unit 9 is labeled "unit9worksheet1r1RNC1" in the February 9 posting.
Monday, February 18, 2008
Honors Labs
1) Many of you are in danger of getting a zero for the ferryman ( relative motion) lab. Where are they?
2) Most of the harmonic labs have be redone for many reasons.
a) How can you say that the k values were similar or not without showing me the calculations and results for the ks for each of the three parts? You must do these calculations and show them and the results.
b) Many of you plotted deltaL vs Mg for part 1 which is fine. Then k=1/slope. Then you said units of slope were N/m but they are really m/N which makes sense since the slope is 1/k.
c) Many of you found the velocity in part 3 by dividing the xmax by the time from the gate, when the gate recorded how long it took the card to pass through, not how long it took the card to get from xmax to the equilibrium point. You must use vmax = cardheight (or width)/time.
d) You were supposed to use the slope to find k not individual points on the graphs. Use equations we developed as noted below
To find the k values use : part 1 k= 1/ slope ; part 2 k = (2pi)squared/slope part 3: k =m times square of slope .
e) Many of you concocted strange explanations for how a larger mass increased the amplitude and thus led to shorter or longer periods. The mass has nothing to do with the amplitude. The mass determines where the new equilibrium is, but once you let the mass rest there, you are the one who pulls the spring as far as you want to establish the amplitude. You did this several times in parts 3 and 4.
Also, our theory and your data show amplitude does not affect period (see part 4 for instance.) In any case, the mass effects the period in a horizontal oscillator also, so the mass effect on period has nothing to do with the force of gravity. It has to do with inertia, resistance to acceleration. Omega goes as the square root of the restoring acceleration per meter of displacement. The acceleration is inversely proportional to the mass, therefore omega is proportional to the square root of 1/mass. Since T is inversely proportional to omega, T is proportional to the square root of mass.
f) some of you decided that despite part 4 data to the contrary, T depends on amplitude. Don't let your preconceived notions over rule data so easily.
g) For the post lab some of you lost track of units. Remember 1 g = .0001kg and 1 cm = .01m
h) Also in the post lab, many of you went through entire calculations to come up with the new mass ( question 4)= .4015 kg. It doesn't. Since m1 = .1 and T2 = 2 x T1 and T is proportional to square root of mass then m2 must be exactly = 4 x m1. You don't need a calculator, or even a calculation for this.
2) Most of the harmonic labs have be redone for many reasons.
a) How can you say that the k values were similar or not without showing me the calculations and results for the ks for each of the three parts? You must do these calculations and show them and the results.
b) Many of you plotted deltaL vs Mg for part 1 which is fine. Then k=1/slope. Then you said units of slope were N/m but they are really m/N which makes sense since the slope is 1/k.
c) Many of you found the velocity in part 3 by dividing the xmax by the time from the gate, when the gate recorded how long it took the card to pass through, not how long it took the card to get from xmax to the equilibrium point. You must use vmax = cardheight (or width)/time.
d) You were supposed to use the slope to find k not individual points on the graphs. Use equations we developed as noted below
To find the k values use : part 1 k= 1/ slope ; part 2 k = (2pi)squared/slope part 3: k =m times square of slope .
e) Many of you concocted strange explanations for how a larger mass increased the amplitude and thus led to shorter or longer periods. The mass has nothing to do with the amplitude. The mass determines where the new equilibrium is, but once you let the mass rest there, you are the one who pulls the spring as far as you want to establish the amplitude. You did this several times in parts 3 and 4.
Also, our theory and your data show amplitude does not affect period (see part 4 for instance.) In any case, the mass effects the period in a horizontal oscillator also, so the mass effect on period has nothing to do with the force of gravity. It has to do with inertia, resistance to acceleration. Omega goes as the square root of the restoring acceleration per meter of displacement. The acceleration is inversely proportional to the mass, therefore omega is proportional to the square root of 1/mass. Since T is inversely proportional to omega, T is proportional to the square root of mass.
f) some of you decided that despite part 4 data to the contrary, T depends on amplitude. Don't let your preconceived notions over rule data so easily.
g) For the post lab some of you lost track of units. Remember 1 g = .0001kg and 1 cm = .01m
h) Also in the post lab, many of you went through entire calculations to come up with the new mass ( question 4)= .4015 kg. It doesn't. Since m1 = .1 and T2 = 2 x T1 and T is proportional to square root of mass then m2 must be exactly = 4 x m1. You don't need a calculator, or even a calculation for this.
All students: Pendulum Energy
Here is a derivation of the energy in a pendulum you can use to understand how to do some homework and other problems:
pendulumenergy3.doc
pendulumenergy3.doc
Sunday, February 17, 2008
All Students Reminder on Labs
All labs are due on the second school day after the experiments are concluded. For example: completed on Monday lab is due Wednesday. Completed on Friday labs may be due on Monday or Tuesday: Tuesday if no special notice is given, Monday if a an announcement or your schedule say so.
Mathematical Revised Schedule
Here is a link to a revised schedule,; note quiz (a quiz not a mini test) on Tuesday.
CPMUnit9harmsched08r1.doc
CPMUnit9harmsched08r1.doc
Saturday, February 16, 2008
AP Electrostatics Schedule, Notes and Sheets
We are about to begin our study of charged particles and how they interact with each other. We start with the forces between charges and how they can be described and analyzed using fields much as we use the gravitational field of planets to determine the force on masses.
Sorry about giving you an assignment over the weekend in addition to the lab. However, the work load for this brief unit is not too severe, since these worksheets are shorter than usual, and there are few book problems. In any case, we are now about 3 days behind last year, and last year we had did not have enough review time for everyone, so we will have to push a bit. The material is not hard, just do not let some new terminology and a new type of force intimidate you. Everything we have learned so far about how to add forces and work and energy will be the same for electric forces.
APUnit10ElectStSched08.doc
NotesElectrostatic2-08.doc
Unit10Worksheet1.doc
Unit10Worksheet2.doc
Unit10Worksheet3.doc
UnitAP10ESproblemsheet.doc
APUnit10ElectStSched08.doc
NotesElectrostatic2-08.doc
Unit10Worksheet1.doc
Unit10Worksheet2.doc
Unit10Worksheet3.doc
UnitAP10ESproblemsheet.doc
Thursday, February 14, 2008
AP and Honors QUIZZES
Yes there will be quizzes tomorrow.
AP about 25 minutes.
Honors a reading type quiz,, but know something about oscillators, pendulums, frequency, energy.
AP, see a previous post about your quiz, although I could not find my ancient parchments so the grammar part is out.
AP about 25 minutes.
Honors a reading type quiz,, but know something about oscillators, pendulums, frequency, energy.
AP, see a previous post about your quiz, although I could not find my ancient parchments so the grammar part is out.
Wednesday, February 13, 2008
Honors Lab Groups
Starting tomorrow we will have new, slightly changed , lab, and study groups:
Honors Section 1:
Group1:James, Erika, Bobby, Allison
Group2 : Jn, Elliott, Amy, Claire
Group3: Steve, Laura, Ryan, Andrew,Meaghan
Group 4: Jamie, Kyle, Dennis, Brett, ( same old gang)
Group 5: Chris, Caitlyn, Lara, Colleen, Mike
Group 6 Anne Marie, Chrissy, Shannon, Tom
Honors Section 2:
Group1: Amanda, Tucker, Emily, Frankie S., Dylan
Group 2: George, Paige, Julia, Eric,
Group 3: Lexie, Trisha, Dan, Paul
Group 4: Olivia, Zach, Nick, Brian
Group 5: Frankie C., James, Travis, Nelson
If these present any insurmountable difficulties, email me.
Honors Section 1:
Group1:James, Erika, Bobby, Allison
Group2 : Jn, Elliott, Amy, Claire
Group3: Steve, Laura, Ryan, Andrew,Meaghan
Group 4: Jamie, Kyle, Dennis, Brett, ( same old gang)
Group 5: Chris, Caitlyn, Lara, Colleen, Mike
Group 6 Anne Marie, Chrissy, Shannon, Tom
Honors Section 2:
Group1: Amanda, Tucker, Emily, Frankie S., Dylan
Group 2: George, Paige, Julia, Eric,
Group 3: Lexie, Trisha, Dan, Paul
Group 4: Olivia, Zach, Nick, Brian
Group 5: Frankie C., James, Travis, Nelson
If these present any insurmountable difficulties, email me.
AP
Your lab on standing waves must be in tomorrow Thursday 2/14. ( Some Valentine's day present huh?). We will complete the sound resonance lab tomorrow and do a homework review so make sure you have all your unresolved questions from the homework ready.
The quiz on Friday 2/15, ( there's the Valentine's Day present - no test tomorrow) will cover waves and sound, including Doppler, interference, sound levels : intensity & decibels, resonance (standing waves), reflection, and grammar of early Phoenecian dialects and the economic and social consequences final phase of the Peninsular Wars on the Spanish peasantry.
Study hard!
The quiz on Friday 2/15, ( there's the Valentine's Day present - no test tomorrow) will cover waves and sound, including Doppler, interference, sound levels : intensity & decibels, resonance (standing waves), reflection, and grammar of early Phoenecian dialects and the economic and social consequences final phase of the Peninsular Wars on the Spanish peasantry.
Study hard!
Honors Lab
Here is the next lab we will be doing tomorrow ( Thursday 2/14) and Monday.
Please download it and read it and bring it in, in that order. This way we will have a pretty good chance of getting the lab done. We still have to get to the pendulum before we move on to the fun of waves ( the giant Slinky lab and vibrating strings), so lets be ready to move quickly on this lab.
SimpleHarmonicMotionLab-08.doc
Please download it and read it and bring it in, in that order. This way we will have a pretty good chance of getting the lab done. We still have to get to the pendulum before we move on to the fun of waves ( the giant Slinky lab and vibrating strings), so lets be ready to move quickly on this lab.
SimpleHarmonicMotionLab-08.doc
Monday, February 11, 2008
All Students Sort of Urgent
The notes on adding waves I posted a couple of days ago (February 9) are pretty advanced for high school so just look at them and if they intrigue you, by all means review them in detail. Otherwise don't worry about them at all.
Honors and Mathematical New Table for Wheel and Oscillator
Here is the link to a new and improved version which you should find easier to use.
Wheelandosc2-08.xls
Wheelandosc2-08.xls
Sunday, February 10, 2008
Great Physics Lecture
Saturday March 1 at 2PM at the Physics Lecture Hall, Busch Campus, Rutgers University
The 2008 Irons Lecture in Physics and Astronomy
These lectures are intended for the general public and high school students are encouraged to attend. Ridge has had good turnouts for the past two years and the students found them both interesting and rewarding.
This year, Professor Arkani-Hamed from the Institute for Advanced Studies at Princeton will discuss how the new huge particle accelerator starting to operate in Switzerland will help us explore the nature of the universe and the particles we are made of at yet higher energy levels and over unimaginably small distances.
The 2008 Irons Lecture in Physics and Astronomy
These lectures are intended for the general public and high school students are encouraged to attend. Ridge has had good turnouts for the past two years and the students found them both interesting and rewarding.
This year, Professor Arkani-Hamed from the Institute for Advanced Studies at Princeton will discuss how the new huge particle accelerator starting to operate in Switzerland will help us explore the nature of the universe and the particles we are made of at yet higher energy levels and over unimaginably small distances.
Here is a link and/or contact me for details. Irons Lecture -08
Extra credit will be available to my students if they submit a brief report of what they learned at the lecture.
AP Handy review sheet on waves and sound
I am not requiring you to do this, at least not yet, but it will help you learn the subject and prepare for tests and exams.
ReviewforWaveSpeedetc.doc
ReviewforWaveSpeedetc.doc
REVISEDHonors and AP Notes on Circular Motion and Oscillations
I have updated these notes slightly and I hope made them a bit easier to use. Also, look over the homework on Oscillations and Waves sheet. You should be able to get through all the problems by the time we finish with waves. Ooops, since I posted some of the solution in , extra credit will no longer be available. The original problems and older solutions are now posted here. I did these a while ago and I am not sure they match the latest problems, but if they don't it should be obvious.
NotesonCircHarmonic2-08.doc
HmwrkonOscillsWaves2-08.doc
HmwrkonOscillsWavessolns.doc
NotesonCircHarmonic2-08.doc
HmwrkonOscillsWaves2-08.doc
HmwrkonOscillsWavessolns.doc
Mathematical Physics Schedule, Worksheets,etc.
Here are links for our new unit on oscillations and waves
CPMUnit9harmsched08.doc
NotesonCircHarmonic2-08.doc
GroupOscandwheel.xls
HmwrkonOscillsWaves2-08.doc
RevProbRotandHarmR2.doc
Worksheet1onWavesR1.doc
CPMUnit9harmsched08.doc
NotesonCircHarmonic2-08.doc
GroupOscandwheel.xls
HmwrkonOscillsWaves2-08.doc
RevProbRotandHarmR2.doc
Worksheet1onWavesR1.doc
Saturday, February 9, 2008
Relative Motion ( ferry boat) Lab Take 2
The lab report is informal since there was no physical procedure . However do describe the situation with words ( like the boat was pointed straight across the river and the velocity indicated was .... and the y distance ( across the river) was... and the x distance ( along the river) was.... Discuss what you are calculating and why you are using the equations you are using. You would want somebody coming along and using the simulation the way we did to be able to understand what you did and why you did it the way you did.
Be concise but not lazy and unintelligible.
All students Waves and Sound
Here are links to notes you should all read over. AP and Honors will be expected to have some, if not total, understanding of this material. Don't memorize it.
MaterialPropertiesandLongr1.doc
DopplerEffectTotal
MaterialPropertiesandLongr1.doc
DopplerEffectTotal
The Doppler Effect is used to monitor weather, tell us the distance of galaxies ( when combined with special relativity), and get you speeding tickets. You should know something about it.
AddingWavesBeats.doc
AddingWavesBeats.doc
Wednesday, February 6, 2008
All students: Lab due dates
It is imperative that you work on lab reports while the experience is fresh in your mind. To make sure this happens, all labs are due on the second school day after the lab is completed. We will do more work on labs in class. Labs done on Monday are due Wednesday, labs done on Thursday are due Monday, Friday Labs are due Tuesday. One day late you lose a letter; 2 days late you get a zero for keeps. Bad printers, nonfunctioning email, hungry dogs, etc. will no longer be considered.
AP Labs
For those of you who have not returned your Harmonic Motion labs, do so: no lab by Friday morning and you'll get a permanent zero.
For the few of you who have not turned it the first time, I 'll have it by the time I leave tomorrow, or you will get a permanent zero for it. For those who have not yet turned in the wave lab, I'll have it by tomorrow when I leave or again, a permanent zero.
Monday, February 4, 2008
Mathematical
Please download and print these sheets. Bring them in tomorrow, Tuesday 2/5/08. Try doing #1 on the review sheet tonight.
PlanetWSCPM.xls
gravandrotvariablereviewsheet.doc
PlanetWSCPM.xls
gravandrotvariablereviewsheet.doc
Honors Quiz
Be prepared for a quiz tomorrow or Wednesday on 1) the 3 kinematic equations for delta y; 2)the definitions of v and a; and 3) how to use those definitions to find delta t.
Remember to bring you relative motion work sheet in tomorrow and Wednesday.
Remember to bring you relative motion work sheet in tomorrow and Wednesday.
Friday, February 1, 2008
Honors Physics
The general solution we developed was Dx = vx Dt and Dt = (vyf - vyi)/ay
and vyf = sqrt ( 2ayDy+ vyi squared)
so we have the ugly but useful:
Dx = vx [sqrt ( 2ayDy+ vyi squared)-vyi]/ay
Now rememeber that
ay =-g;
vx vicosthetaH; and
vyi = vi cos thetaV
and you are all set to solve some tough problems like those on worksheet 2.
and vyf = sqrt ( 2ayDy+ vyi squared)
so we have the ugly but useful:
Dx = vx [sqrt ( 2ayDy+ vyi squared)-vyi]/ay
Now rememeber that
ay =-g;
vx vicosthetaH; and
vyi = vi cos thetaV
and you are all set to solve some tough problems like those on worksheet 2.
AP Notes on Wave Speed and Your Wave lab
1) Here is a link to notes on wave speed. It shows how mechanical properties of medium affect wave speed.
NotesonTransverseWaveSpeedR1.doc
Make sure you read the notes on rotational and harmonic motion posted about 12/30.
2) Wave Lab. Think carefully about this: if you send F pulses per second into the heavy spring, and assuming the pulses don't get lost along the way through friction with the floor, how many pulses per second reach the light spring? Is it the same in the other direction as well?
Also does wave length time frequency determine speed, or does speed /frequency determine wavelength?
NotesonTransverseWaveSpeedR1.doc
Make sure you read the notes on rotational and harmonic motion posted about 12/30.
2) Wave Lab. Think carefully about this: if you send F pulses per second into the heavy spring, and assuming the pulses don't get lost along the way through friction with the floor, how many pulses per second reach the light spring? Is it the same in the other direction as well?
Also does wave length time frequency determine speed, or does speed /frequency determine wavelength?
Mathematical New Schedule and worksheets
Here are links to an updated schedule and worksheets updated for your use. I am also including the link to the old R-1 which you really should have been using for a while. Also included is the link to notes on torque and moment of inertia. These may be a bit tough, but read them.
Also: complete that centripetal force lab by Monday or else. Its formal but you can be brief. Purpose was to find out is ac = omega squared r by seeing if Mwashers g = Mstopper x omega squared r.
ProblemSheetCPMR-2.doc
CPMUnit8RotPrt2sch07-8.doc
ProblemSheetCPMR-3.doc
ProblemSheetR-1rev1.doc
NotesonTorquerev12-30.doc
Also: complete that centripetal force lab by Monday or else. Its formal but you can be brief. Purpose was to find out is ac = omega squared r by seeing if Mwashers g = Mstopper x omega squared r.
ProblemSheetCPMR-2.doc
CPMUnit8RotPrt2sch07-8.doc
ProblemSheetCPMR-3.doc
ProblemSheetR-1rev1.doc
NotesonTorquerev12-30.doc
Honors 2 Dimensional Motion
Here is a link to your next worksheet, Do the first 2 problems for Monday and the rest for Tuesday.
WorksheetforHonors2D-2-80Physics.doc
WorksheetforHonors2D-2-80Physics.doc
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