﻿ Mr. Stapleton Physics 100, Semester 1, 2013-2014

Class 78 June 5th
Warm-Up:

How many ways can you think of to light a fire without using a small fire (e.g. matches, lighter, magnesium sparks...) to get the big fire started?

Today:

• Tie up loose ends
• Turn in textbooks
• Toast Marshmallows -- Physics of primitive fire making
Class 77 June 3rd
Warm-Up:

1. Forward I'm heavy.  Backward I'm not.  What am I?

2.  Figure out the pattern.  Then tell what comes after 15 in the last series.

7, 5, 4

2, 3, 5, 4

12,6,3,5,4

1,3,5,4

15...

Today:

• Return Quizzes
• Turn in textbooks
• Wrap things up
• Exam review / study time

Handouts:  See final exam prep page

Homework:

Find your textbook and bring it to next class.

Study for the final.

Class 76  May 29th
Warm-Up:

How does the ring shooter work?

Today:

• Electricity Quiz
• Work on solar cookers
• Make-up time

Homework:

• Turn in missing assignments
• Bring books to class
Class 75 May 22th
Warm-Up:

Something strange happens when I drop a magnet down a copper pipe.  What happens, and why?

Today:

Homework:

Class 74  May 19th
Warm-Up:

What will happen if I run 115V of household current through a pickle?

Why?

Today:

• Finish motors
• Complete quiz review
• Wiring activity?

Homework:

Class 73  May 15, 2014
Warm-Up:

1.  Which of the circuits on the right are series circuits?

2.  Which circuits are parallel?

3.  In which direction do the electrons flow, in the diagrams?

4.  In some of these circuits, one light bulb burning out can cause all of the light bulbs to burn out.  In which circuits could this happen?

5.  How do light bulbs work?

Today:

• A1/2, A5/6:  finish discussing phet simulation; make solenoid buzzers.
• A3/4:  finish buzzers.  Wiring circuits or motor.
Class 72  May 13, 2014
Warm-Up:

What are these pictures supposed to convey?

Today:

• Finish Electricity notes Part I?  Electrostatics.
• Electricity notes Part II.  Circuits.
• If there's time -- Make a Solenoid Buzzer.
Class 71  May 6, 2014
Warm-Up:
1. When you plug an appliance into a typical wall receptacle, how many volts of electric potential is the appliance receiving.
2. The Van de Graaff generator produces an electrical potential of thousands of volts.
3. Which will give you a stronger shock, the electricity in a wall receptacle or a Van de Graaff generator?
4. Why?

Today:

• Projects are graded -- many are missing.  Turn in your instrument project recordings.
• Contest Results
• Electricity notes Part I.  Electrostatics.
• Electricity notes Part II.  Circuits.

Current Contest Rankings:  Overall rank = Doppler rank + 2*(Name That Tune Rank).  Yellow teams are missing either doppler or name that tune data.

 Scaled Rank (2xNTT + D) Current Overall Rank 5 Natalie, Karyn, Mackenzie 1 16 Jackie, Morgan, Dominique 2 17 Eniz, Zach, Peter 3 21 Alex, Sam, Sarah 4.5 21 Allie, Anna, Emily 4.5 21 Tran, Ellie 6 28 Alyssa, Sophie, Deanna 7 29 Sarah, Sonja, Ashlyn 8.5 29 Kara, Christina 8.5 33 Emily, Danielle 10 36 Charlotte, Maria, Faris 11 37 Justin, Jake 12 40 Alex, Ben 14 40 Hannah, Gabrielle 14 40 Ryan, Chris, Dom 14 42 Pat and John 16 44 Liam, Carolyn 17 45 Adam, Belan 18 49 Mary, Sarah F., Shelby 19 51 Adam, Trevor 20 54 Dylan, Chris G, Zach 21 55 Andrew, Tyler 22 Groups in yellow are missing some contest component.

Homework: ?

Class 70  May 6, 2014
Warm-Up:
The "triboelectric series" (on the right) ranks materials based on some property.  Can you guess the property?

Today:

• I haven't finished grading all of the project .wav files.  I'll have that done by next class.
• A1/2 -- contest, Electrostatics
• A3/4 -- finish name that tune.  Electrostatics
• A5/6 -- finish contest.  Test.  Electrostatics

Current Contest Rankings:  Overall rank = Doppler rank + 2*(Name That Tune Rank)

 Doppler Velocity Determination Contest Rank Group #1 error #2 error #3 error Average Error 1 Adam, Belan 0.25% 0.00% 0.00% 0.08% 2 Charlotte, Maria, Faris 34.54% 0.11% 0.91% 11.85% 3 Liam, Carolyn 0.51% 21.29% 18.78% 13.53% 4 Sarah, Sonja, Ashlyn 0.01% 43.60% 0.04% 14.55% 5 Pat and John 33.08% 66.00% 10.10% 36.39% 6 Alex, Sam, Sarah 0.00% 54.76% 79.87% 44.88% 7 Alex, Ben 33.01% 45.14% 59.63% 45.93% 8 Eniz, Zach, Peter 138.67% 15.20% 10.84% 54.91% 9 Hannah, Gabrielle 82.26% 43.59% 39.73% 55.20% 10 Allie, Anna, Emily 163.23% 31.10% 19.59% 71.30% 11 Emily, Danielle 799.75% 22.63% 442.24% 421.54%

 Name That Tune Contest Rank Group Name That Tune Score 1 Eniz, Zach, Peter 21 2 Allie, Anna, Emily 20 3 Alex, Sam, Sarah 19 4 Kara, Christina 19 5 Tran, Ellie 18 6 Sarah, Sonja, Ashlyn 14 7 Pat and John 11 8 Faris, Charlotte, Maria 10 9 Liam, Carolyn 8

Homework: None

Class 69  May 4, 2014
Warm-Up:

Explain this video --  "Amazing Water and Sound Experiment"  -- One class has already seen this.

Today:

• Practice time (except A56)
• Contest
• Finish project recordings and email to Mr. Stapleton.  Try to send them all in one message.

Homework:

Class 68  April 30, 2014
Warm-Up:

Today:

Homework:

• Contest next class.  Decide who will play and who will guess.
Class 67  April 28, 2014
Warm-Up:

Get out your instrument.  Listen to these changes in pitch.  Try to match the interval with your instrument.  See if you can determine the change in pitch, measured in half-steps.

1.  Interval 1
2.  Interval 2
3.  Interval 3

Today:

Homework:

• A1/2 and A 3/4:  Test next class.  A 5/6:  Test on Tuesday.
• Contest on Friday.  Songs and Doppler ID. (Final song list)  There will be no volume contest this year.
• Turn in all project recordings and Doppler ID sheet. by Friday.
Class 66  Thursday, 4/17/14
Warm-Up: Practice test questions

20.  Explain how electricity causes a speaker cone to move in and out.

21. Explain how a magnetic guitar pickup sends signals to an amplifier.

22.  What does an amplifier do?

23.   Why is the pickup wire coated with enamel?

24.   Why does the pickup wire need to be wound so many times?

25.   Why does the pickup wire need to be so thin?

26.    Why won’t the pickup work if the wire gets broken?

Today:

Homework:

• Practice test due on the Monday after break.  Look at the solutions if you need to.
• Name that tune contest on Friday after break.  Also doppler identification contest.
• Test on Wednesday after break.
Class 65  Tuesday, 4/15/14
Warm-Up:

1.  What is the real shape of the standing wave in a plucked string?
2.  When music experts talk about the pitch of a vibrating string, they talk about "fundamental" frequency and "harmonics."  What do these terms mean?
How can you hear them on a string instrument?
3.  Why are some pickups called "humbuckers?"
4.  Why should Hz be capitalized?
(my apologies for getting it wrong for my entire life up until now)

Today:

• How to play at home...
• speakers
• playing through a PC -- control panel (sometimes delayed)
• Begin recordings
• You may need to plug in your mic to the microphone jack before you open Audacity.  If you want to listen as you record, get into the control panel and make that happen.  You will need headphones.  Recording directions are in your project guidelines.
• Get practice test and answers

Homework:

• Practice test due on the Monday after break.
• If you want your own plugs, scrounge for old headphone plugs or other audio plugs.
• Bring in headphones so that you can listen to your recordings.
Class 64  Friday, 4/10/14
Warm-Up:

1. What was the loudest noise ever?
2.  What's the difference between melody and harmony?
3.  What's the difference between vibrato and tremolo?

Today:

• Melody vs Harmony
• Finish Music Notes
• Create a spreadsheet for marking frets (even if you didn't use a spreadsheet)
• Mark your fret marks.  Mark minor and major keys if you want.
• Start making recordings.

Handouts:

Homework:

• If you want your own plugs, scrounge for old headphone plugs or other audio plugs.
• Bring in headphones so that you can listen to your recordings.
Class 63  Wednesday, 4/9/14
Warm-Up:

Suppose you calculate the correct position of your first fret mark, based on the correct frequency for that musical note.  When you hold the string down at that first fret mark (one half step above the "open string") and pluck, you may find that the pitch is not exactly what you expected.

1.  What might cause the pitch to be different from the frequency you used in your calculations?  [hint: you're pushing the string downward]
2.  Will the actual frequency tend to be too high or too low?

Today:

• Brainstorm songs for "name that tune" competition.
• Finish pickups.  Try instruments.  Make recordings.
• How to listen as you record.

Handouts:

Homework:

• If you want your own plugs, scrounge for old headphone plugs or other audio plugs.
• Bring in headphones so that you can listen to your recordings.
Class 62  Monday, 4/7/14
Warm-Up:

Suppose the frequency of a musical note is 500hz...
1.  What is the frequency of a note one octave higher?
2.  What is the frequency of a note two octaves higher?
3.  What is the frequency of a note 1 half step higher?
4.  What is the frequency of a note 2 half steps higher?

Blocks 1 (8:30) and 2 (9:30) - Check out Dale Earnhardt's show car at CTE

Today:

• Some classes see Dale Earnhardt's show car
• Get instruments working
• Brainstorm songs for "name that tune" competition.

Handouts:

Homework:

Class 61  Thursday, 4/3/14
Warm-Up:

True:
If you create an electric current in a coil of wire, that wire will push or pull a nearby magnet.

True: If you move a magnet near a coil of wire, you will create an electrical current in the coil of wire.

*The diagram on the right shows some of the parts of a speaker.  The yellow wires are part of a circuit that is powered by a stereo.  The stereo provides current that alternates in direction and magnitude.  How does this create sound?

Today:

• Finish notes -- physics and music
• Create fret placement calculators
• Work on instruments  -- begin making your pickup when your instrument works acoustically.

Handouts:

Homework:

• Think about how to amplify your instrument without an electric amp.
Class 60  Tuesday, 4/1/14
Warm-Up:
None -- website wasn't working

Today:

• Return Tests
• Finish notes on music
• Create fret placement calculator

Handouts:

Homework:

• Think about how you might want to design your instrument.  Hopefully you can build it next class.
Class 21  Friday, 3/28/14
Warm-Up:
How do you think we might make lever sledding even safer than before?

Today:

Handouts:

Homework:

• Think about how you might want to design your instrument.  Hopefully you can build it next class.
Class 59  Wednesday, 3/26/14
Warm-Up:
Some instruments are played with bows.
1.  How does a bow cause the a string to make sound?
2.  What needs to be added to the bow so that it can perform at its best

Today:

• Sledding... hopefully.
• If the sled doesn't work:  waves concepts applied to music and instrument design

Handouts:

Homework:

• Study for test.  Test on Friday.
Class 58  Monday, 3/24/14
Warm-Up:

1.  How many nodes and antinodes are in shown in the standing wave above?  How many wavelengths?

2. What is the wavelength of the standing wave?

3.  If the frequency of the standing wave is 220hz, what is its velocity?

4.  At that same velocity, how long should the wavelength be in order to produce a frequency of 440hz (an "A"?

5.  What characteristics determine the frequency of a plucked string?  Why?

Today:

• Discuss the test -- finish practice test discussion if necessary.
• Introduction to electric diddley bow project, major and minor keys, etc.
• Design/plan your instrument.  Will you need to bring materials?
• Fret placement calculations.

Handouts:

Homework:

• Study for test.  Test on Friday.
• Snow lever on Monday.
Class 57  Thursday, 3/20/14
Warm-Up:

1.  Sound volume is measured in decibels.  The table below relates sound pressures (amplitudes) to decibels.  Do you notice anything interesting?  Do you have any questions?

2.  How loud is the unit ventilator?

3.  Why is there a limit regarding how loud a sound can be?

 Source of sound (in air) Sound Pressure -- amplitude (psi) Volume in Decibels, calculated by 20*LogP/Po Po (threshold of hearing, in psi) Loudest Pressure divided by Quietest Audible Pressure Shockwave (distorted sound waves > 1 atm; waveform valleys are clipped at zero pressure) 14.69543147 194.0956869 2.9E-09 5,067,390,163 Theoretical limit for undistorted sound at 1 atmosphere environmental pressure 14.69543147 194.0956869 Stun grenades 2.900652647 180.0019545 Simple open-ended thermoacoustic device[6] 1.830166788 176.0018534 .30-06 rifle being fired 1 m to shooter's side 1.053662074 171.206067 M1 Garand rifle being fired at 1 m 0.728498912 168.0006182 Rocket launch equipment acoustic tests 0.580130529 166.0225545 Jet engine at 30 m 0.091660624 149.9956962 Threshold of pain 0.009166062 129.9956962 Vuvuzela horn at 1 m 0.002900653 120.0019545 Hearing damage (possible) 0.002900653 120.0019545 Jet engine at 100 m 0.029006526 140.0019545 Non-electric chainsaw at 1 m 0.000913706 109.9681656 Jack hammer at 1 m 0.000290065 100.0019545 Traffic on a busy roadway at 10 m 9.15156E-05 89.98194182 Hearing damage (over long-term exposure, need not be continuous) 5.16316E-05 85.01035459 Passenger car at 10 m 2.90065E-05 80.00195455 EPA-identified maximum to protect against hearing loss and other disruptive effects from noise, such as sleep disturbance, stress, learning detriment, etc. #NUM! Handheld electric mixer 5.51124E-06 65.57702656 Classroom Unit Ventilator TV (set at home level) at 1 m 2.90065E-06 60.00195455 Normal conversation at 1 m 2.90065E-06 60.00195455 Very calm room 9.19507E-08 30.02313979 Light leaf rustling, calm breathing 9.16606E-09 9.995696197 Auditory threshold at 1 kHz 2.90065E-09 0.001954545

Today:

• Go over homework.
• Final mechanical waves info --   finish notes and practice test
• Air Pressure

Handouts:

Homework:

• Study for test.  Test next Friday.
• Barring unforseen troubles, snow lever next Wednesday.

Class 56  Tuesday, 3/18/14
Warm-Up:

Some fireplaces and wood stoves have blowers.  When the blower operates at the resonant frequency of some part of the fireplace, the stove rattles or buzzes.

As a stove heats up, it often buzzes for a while and then stops.  The buzzing may start and stop several times over the course of a day.  If the blower always operates at the same rpm, why does the buzzing start and stop?

Today:

• Try to fling stuff or people with the snow lever -- if it hasn't broken in a previous class
• Continue Mechanical Waves.  Work on Practice Test

Handouts:  Practice Test

Homework:

A1/2 -- Practice test, 1-23
A3/4 -- Practice Test, 1-31
A5/6 -- Practice Test 1-31
Class 55  Friday, 3/14/14
Warm-Up:

Bats have two very sensitive ears and the ability to produce prolonged series of sound waves.  By making a sound and then listening to the echo, how can a bat hear a difference between...

1.  ...an object to its left versus its right?

2.  ...distant objects versus nearby objects?

3.  ...large objects versus smaller objects?

4.  ...objects moving toward versus away from the bat?

5. You see a flash of lightning.  10 seconds later, you hear the thunder.  How far away was the lightning strike?

Today:

• Blocks A1/2 and A3/4:  Check homework
• Wrap up introductory mechanical waves stuff (resonance, more problems for homework)

Handouts:

Homework:  A56 -- complete Waves practice #1

Class 54  Wednesday, 3/12/14
Warm-Up:
1. The speed of sound in air is about 768 miles per hour.  What happens when a noisy object travels faster than the sounds it is producing?
2. Suppose you're standing next to a highway, listening to the passing cars.  What happens to the cars' pitch as they pass by?  Do you know why?

Today:

Videos from last year:

Homework:  Blocks A1/2 and A3/4 -- complete #1-23 on waves practice sheet.  Block A5/6  -- no homework.

Class 53  Monday, 3/10/14
Test today, in Library Computer Lab

Class 52  Thursday, 3/6/14
Warm-Up: Prepare to estimate the initial mechanical advantage of this snow lever.

Part I: Snow Lever Parts

Part II:  Snow lever flings Emmerson

Today:

Homework:

• Test next class.
• Bring snow clothes next Wednesday.  We will try the snow lever (weather permitting, and assuming it doesn't break during an earlier block).
Class 51  Friday, 2/21/14
Warm-Up:

Is curling ice (for the sport of curling) rougher or smoother than regular ice?

Today:

Homework:

• Test on the 2nd class day after break.
Class 50  Wednesday, 2/19/14
Warm-Up:

1.  An arch can't support itself if the top pieces are missing, but a dome can.  Why?

Today:

Homework:

• Finish practice test
Class 49  Monday, 2/17/14
Warm-Up:

1.  How does an arch (like the one on the right) support itself?

2.  The arrows in the second diagram represent forces of different magnitudes and directions, acting on an object.  In which direction will the object move?

3.  In the third diagram on the right, which of the two arches  is most stable?

4.  In a stable arch, what type of force plays the biggest role -- compression, tension, or bending?

5.  If you hold an egg in your palm and squeeze it, why is it so hard to crack?

6. How did Mr. Stapleton design this stable arch? Link

Today:

Homework:

• ?
Class 48  Thursday, 2/13/14
Warm-Up:

What is the mechanical advantage of a Rube Goldberg machine?
10 rube goldberg machines

Today:

• Check homework problem.
• Activity:  creating and testing simple machines.

Homework:

• Bring snow clothes on Monday!
Class 47  Tuesday, 2/11/14
Warm-Up:

When a wooden dart was fired into the class pendulum, the pendulum's mass was 0.722kg.  The dart's mass was 0.023kg.  After the collision, the pendulum swung to a height of 0.76m.  What was the dart's mass before the collision?

Today:

• Calculate the mechanical advantages of ten machines.

Homework:

• Ballistic pendulum problem #2.
Class 46  Friday, 2/7/14
Warm-Up:

1. Have you ever tied a trucker's hitch?
2. A trucker's hitch includes a simple machine that has* a mechanical advantage of two.  Explain.
video

Today:

• Discuss homework
• Return Quizzes
• Ballistic Pendulum Calculations

Homework:  None

Class 45  Wednesday (advisory day), 2/5/14
Warm-Up:

What is a machine?

Today:

• Quiz:  Momentum and Impulse
• Ballistic Pendulum Calculations
• Mechanical advantage activity (simple block and tackle)

Homework:

• Read textbook section 8.7.  Answer review questions 5,14, and 16, on page 117.
Class 44  Monday, 2/3/14
Warm-Up:

1.  How does a safety helmet protect one's head?
2.  How do aerial skiers turn in the air?
3.  Why did a guy in a "squirrel suit" crash land in a bunch of cardboard boxes?

Squirrel suit dive into cardboard boxes

Today:

Homework:

• Quiz next class over impulse and momentum notes, textbook questions, nerf dart calculations, and ballistic pendulum calculations.
Class 43  Thursday, 1/30/14
Warm-Up:

If the mass of the ball is equal to the mass of the pendulum, how will the velocity "just after collision" compare to the velocity of the ball "before collision?"

Today:

Homework:

• Finish all of the problems in the "momentum notes" handout.
• Calculate the average force that propelled your Nerf dart during it's fastest launch.

Other:  Mythbusters season 1 episode 12 chicken gun

Class 42  Tuesday, 1/28/14
Warm-Up:

Two cars crash into one another.

1.  What happens to their net momentum during the crash?
2.  What happens to their net energy during the crash?

Today:

• Finish the notes on impulse and momentum
• Nerf dart activity.  Make a Nerf dart fly as fast as possible, powered only by compressed air.

Homework:  None

Class 41  Friday, 1/24/14
Warm-Up:

1.  What will happen if I hold a tennis ball on top of a basketball and drop them to the floor together?

2.  What if I reverse their positions?

3.  Have you ever been whipped by a towel?

4.  Do you know how to maximize the effectiveness of a towel whip?

Today:

• Check/review homework.  [Read sections 7.1-7.3, in the textbook.  Answer questions 1, 3, 5, 7, 9, and 10 on page 99.]
• Notes:  Momentum and Impulse
• Investigate the relationship between barrel length and Nerf dart velocity.  Try to decelerate a Nerf dart without damage to the dart.

Homework:

• Read textbook sections 7.4-7.5.    Answer questions 12, 13, 15, and 17.
Class 40  Wednesday (advisory day), 1/22/14
Warm-Up:

Suppose I stand a board on end and shoot it with a Nerf dart.  Am I more likely to knock the board over if I use a dart that sticks to the board or if I use a dart that bounces off of the board?

Today:

Homework:

• Read sections 7.1-7.3, in the textbook.  Answer questions 1, 3, 5, 7, 9, and 10 on page 99.

Class 39  Friday, 1/9
Warm-Up:

1) How does a trebuchet turn human energy to potential energy to kinetic energy?
2) When a trebuchet is firing, is it best for the counterweight to move fast or slowly?

floating arm

Today:

Homework:

• Complete the rest of the midterm review.
• Brief Essay -- Due today, on exam day, or by the end of the quarter.  Here's the school writing rubric.

Class 38  Wednesday, 1/8
Warm-Up:

2.  How did energy change form during the sequence shown on the right?

Today:

• Finish Lab Tasks (last page of midterm review)
• Work time.

Homework:

blob jump record:   http://youtu.be/n8BX6v9k9CU

Class 37  Monday, 1/6
Warm-Up:

How does a "Newton's cradle" work?

Today:

• Grades have been updated.  Some of you need to take the car quiz.
• Complete Lab Tasks (last page of midterm review)
• Review work time.

Homework:

• Complete Midterm Review through #20 of part III.
• Brief Essay -- Due Friday, 1/10/14 or on exam day.  Here's the school writing rubric.
Class 37  Thursday, 1/2
Warm-Up:

Someone winds up a rubber band car and then releases it.  The car accelerates, decelerates, and eventually stops.

1. Describe the energy transformations (changes in type of energy) that take place during this process.
2. At what point(s) is work done, and what is the effect of that work?

Today:

• Return tests
• Begin Midterm Review
• **Self-generated, HANDWRITTEN notes will be allowed for use on the midterm exam.  You may create one page (one side of an 8.5"x11" sheet of paper) of notes for use on the exam.  "Self-generated" means that you must create this sheet yourself.  It may not be simply copied from another source (e.g. another student).  This is in addition to the formulas that will already be provided.

Homework:

Class 36  Thursday, 12/19
Warm-Up:

1.  What's the terminal velocity of a snowflake?  http://e-collection.library.ethz.ch/eserv/eth:23207/eth-23207-02.pdf

2.  How wide was the largest recorded snowflake?

3.  What is the difference between a "snowflake" and a "snow crystal?"

4.  How do you fold paper to cut a perfect snowflake?http://ms-t-inc.com/pdf-file/snowflak.pdf

Final car standings:

[Note: a few numbers seemed way off, so I adjusted them to more reasonable values.  If you have evidence that I sold you short, please show me the evidence.]
 Rank Group Member Names Maximum Velocity (m/s) 1 Ashlyn, Sonja, Sarah 6.1 2 Morgan, Jackie, Dominique 5.23 3 Anna, Emily, Allie 4.18 4 Hannah, Gabrielle 4 5 Faris, Char, Maria 3.86 6 B n A 3.7 7 Alex, Ben, Butthead 3.66 8 Carolyn, Liam 3.57 9 Kara, Christina 3.33 10 Eniz, Peter 3.3 11 Danielle and Emily 3.19 12 Sarah F Mary D Shelby K 3.05 13 Karyn, Natalie, Mackenzie 2.93 14 Dylan, Chris, Zach 2.82 15 Alex, Sarah and Sam 2.82 16 Chris, Dom, Ryan 2.81 17 Jake and Justin 2.44 18 Zach, Pat, John 2.44 19 Trevor and Adam 2.4 20 Deanna, Claudia 2.22 21 Tran, Ellie 1.87 22 Andrew, Ryan, Tyler 1.87 23 Alyssa and Sophie 1.7

Today:

1. Congratulations to Ashlyn Nuckols, Sonja Unica, and Sarah Root!  Their car reached 6.1m/s (13.6 mph)!
2. Quiz
3. Collect the necessary data to complete your car's row in this spreadsheet:  Cardboard Car Data -- Version 2.0  Including measuring your car's force of rolling friction, using the ramp.  You can complete this data table next class.

Homework:

• None.
Class 35  Tuesday, 12/17
Warm-Up:
Guess how this thing is supposed to be used to fix a car's steering? (Hint:  a bolt and wing nut go in the hole.

Today:

1. Check/review practice quiz.  Solutions to practice quiz.
2. The group with the confirmed fastest run by the end of the day today will be declared the winners.  If any group beats their record next class, an additional prize will be provided.
3. Get a still photograph of your car.
4. Collect the necessary data to complete your car's row in this spreadsheet:  Cardboard Car Data -- Version 2.0  Including measuring your car's force of rolling friction, using the ramp.  You can complete this data table next class.

Homework:

Class 34  Friday, 12/13
Warm-Up:

The camera frame rate is 240 frames per second.  If a car crosses a floor tile in 20 frames, what is its velocity?

Today:

1. Hand out practice quizzes.
2. Fine-tune cars.  If you want more parts, e-mail me a file and give me cardboard.
3. Collect the necessary data to complete your car's row in this spreadsheet:  Cardboard Car Data -- Version 2.0  Including measuring your car's force of rolling friction, using the ramp.

Homework:

Class 33  Wednesday, 12/11
Warm-Up:

Today:

1. Check/review problem set 3, 10-13 and problem set 4.
2. Assemble and test cars.  Hole reinforcers and wooden rubber band cleats are available.
3. Test cars. Assess the effect of lubrication on rolling friction -- try ramp and velocity measurement without lubrication before trying it with lubrication.
4. Collect data and enter into this spreadsheet.  Cardboard Car Data -- Version 2.0

Homework:

• Think of ways to make your car go even faster.
Class 32  Monday, 12/9
Warm-Up:

1.  What do each of the variables stand for in this formula? PE = mgh
2.  If a 0.5kg car is raised to the top of a 2m tall ramp, how much potential energy has been stored in the car?
3.  If you ignore the effects of friction, how much KE should the car have when it reaches the bottom of the ramp?

Today:

1. Check/review problem set 3, 1-9.
2. Work on car analysis problems.  Finish problem sets 1 and 2, all questions.  Check your progress by entering answers into this spreadsheet:  Car Analysis Spreadsheet
3. Assemble cars.  Hole reinforcers and wooden rubber band cleats are available.
4. Test cars  Assess the effect of lubrication on rolling friction -- try ramp and velocity measurement without lubrication before trying it with lubrication.
5. If your car is not ready today, or if you are missing some parts, turn in the correct file and/or cardboard

Homework:

• Finish problem set 3 and complete problem set 4.You can check your answers with the spreadsheet above.  If you start getting wrong answers, and you can't figure out why, just keep going.  Since you use previous answers to calculate later answers, you won't get the later problems right if you got the earlier problems wrong.  That's okay.  There will be a way to find out if you did the later ones right without doing them all over again.
Class 31  Thursday, 12/5
Warm-Up:
1. What can we do with a bowling ball hanging on a long, thin cable?

2. How can we measure and compare the forces of "rolling friction" that act against various rubber band cars?

3. How can we decrease the force of rolling friction?

Today:

• Send Mr. Stapleton your car files, and give him cardboard.
• Work on car analysis problems.  Complete problem sets 1 and 2 by the end of next class.  Check your progress by entering answers into this spreadsheet:  Car Analysis Spreadsheet

Homework:

• Complete Car Analysis Problem set 3 (#1-9).  You can check your answers with the spreadsheet above.  If you start getting wrong answers, and you can't figure out why, just keep going.  Since you use previous answers to calculate later answers, you won't get the later problems right if you got the earlier problems wrong.  That's okay.  There will be a way to find out if you did the later ones right without doing them all over again.
Class 30  Tuesday, 12/3
Warm-Up:

Download this file, and then open it in Rhino.  Use the parts to build the box shown on the right.  The first person to build a box gets some fruit snacks!
(Hint:  use the "move" command in the "transform" menu.  Make sure "Osnap" is turned on and "end" is chosen.  You will also need to rotate one side 90 degrees.)

Today:

• Rule changes:   Maximum allowed force = 100N.  Maximum allowed bounding box volume = 800in3.
• Design Car version 2.0.  Confirm that your car does not exceed 800in3
• Create laser cutting layout for car 2.0.  Upload to the "iteration 2.0" folder in your class' cardboard car google drive folder by the end of class.
• Find/provide cardboard for car version 2.0.  Give this to Mr. Stapleton.

Homework:

• None
Class 29  Friday, 11/22
Warm-Up:

Energy input = Work = force x distance

One way to measure your car's energy in put is to multiply average rubber band force by the rubber band's stretch distance.  Another way would be to multiply the average force of the car's wheels pushing backward against the road by ________.

In comparison to the rubber band force, the wheel force would be _______ (higher or lower) and its work distance would be _________ (shorter or longer).  In theory, the amount of work (and energy) should be _________.

Today:

• Each group member must e-mail Mr. Stapleton a jpeg rendering of your new car (version 2.0) with the parts that he or she created shown in color.  The rest of the car should be grey.  Each group member must contribute changes to the car, even if they are cosmetic.  This individual e-mail is not due until December 5th.
• The group must upload a version car "version 2.0" laser cutter file to the appropriate Google Drive folder by the end of next class (December 3rd).
• The group must turn in cardboard sufficient for cutting parts with the file uploaded to the Google Drive folder.  This is due by the end of class on December 3rd.

Homework:

• Find and prepare cardboard.
Class 28  Wednesday, 11/20
Warm-Up:

What can you do to your car to make it go straighter?

Today:

Homework

Class 27  Monday, 11/18
Warm-Up:

Rubber band cars need an input of energy in order to travel.  The most energy efficient cars turn more of that energy into motion.  The energy input turns into an output of motion.

1. What determines a rubber band car's energy input?  In other words, how can you increase or decrease a car's energy input?
2. By watching cars, how can you tell which cars have the greatest energy output?
3. Suppose a car has an energy efficiency of 50%.  What does that mean?
4. What kinds of things affect a car's efficiency?

Today:

• Check/review homework questions.
• Test your car (Version 1.0) and determine its maximum velocity.  Enter that velocity in to the class Google spreadsheet.
• If there's time, determine your car's energy input.  Calculate its energy output and efficiency.  Enter those values into the Google spreadsheet.

Next Class:  Finish determining your car's force, energy, efficiency, etc.

Any time:  Create a new laser cutting layout file and put it in the appropriate folder in your Google drive.  Give Mr. Stapleton the correct size cardboard, and he will cut the parts for you before the next class.

Homework:

Class 26  Thursday, 11/14
Warm-Up:

How can we measure the traction of a rubber band car?

Today:

Next Class:  Re-design cars; design Version 2.0.

Any time:  Create a new laser cutting layout file and put it in the appropriate folder in your Google drive.  Give Mr. Stapleton the correct size cardboard, and he will cut the parts for you before the next class.

Homework: finish the back side of the Torque notes/problems/questions sheet

Class 25  Tuesday, 11/12
Warm-Up:

1. What kind of rear tires do dragsters use?http://iml.jou.ufl.edu/projects/spring06/gregorzek/tires.html

2. Why do drivers do a "burnout" before each race?

3.  How else do dragsters increase traction?  http://en.wikipedia.org/wiki/Top_Fuel

4.  What do dragster tires look like in slow motion? http://www.youtube.com/watch?v=3Ug6w4ZjwVo&feature=related

5.  Why and how do vehicles "pop wheelies?"

Today:

Ideas:

• Virtual Spare parts "bins" (wheels, frames, cross-members...).  If you don't see what you're looking for, ask.

Homework:

Class 24  Friday, 11/8
Warm-Up:
1. By the end of next class, each group must submit wheel cutting layout drawing file(s).  Drawing files should look like the top diagram on the right.  The wheel design should include extra wheel locks and any other necessary components.  Maximum cardboard dimensions are 23.5" (horizontal) x 11.5" (vertical).
2. By the end of class today, you must each submit, individually, a rendering of the rubber band car with your wheels attached.  You must show your car in a translucent bounding box (as shown on bottom right) and communicate the volume of that bounding box.

Today:

• Finish wheel design.
• Create 3-D rendering of your car and email the rendering to Mr. Stapleton
• Specific directions for turning in today's assignments:
1. Email wheel renderings of your assignment to Mr. Stapleton.  Include…
1. In the subject line, include “[your name] wheel rendering”
3. Include the volume of your bounding box in the email message or subject line
2. Email your group's wheel cutting layout file.  Name the file “[group names] v1 wheels [h x v]”.  The “h” and “v” in the file name should be the horizontal and vertical dimensions of your cardboard, in inches.

Next Class

• Find and cut cardboard.  Turn-in cardboard to Mr. Stapleton for creation of your wheels.
• Submit your wheel cutting layout file.
• Notes and problems relating to cars.  Topics may include torque, friction, energy, work...

Videos:

Homework:

• If you want special cardboard, find some and bring it to next class.
• Make sure that you have turned in your car rendering and that your group is prepared to quickly submit your wheel cutting layout file.
Class 23  Wednesday, 11/6
Warm-Up:
1. What is torque?
2. Suppose a nut is "frozen" onto a bolt.  To loosen it, you're going to need to exert 80 foot·pounds of torque.  You are unable to do this with the wrench that you are currently using.  What kind of wrench should you look for?
3.  If you put much larger diameter wheels on your car, what will that do to your acceleration?

Today:

• Design new wheels, using Rhino

Handouts

Videos:

Homework:  None

Class 22  Monday, 11/4
Warm-Up:
What is the easiest way to use a video to determine a rubber band car's maximum velocity?

Today:

Handouts

Videos:

Class 21  Thursday, 10/31
Warm-Up:
No warm up today

Today:

• Return tests
• Assemble cardboard cars.  Use Rhino to figure out assembly.

Handouts

Videos:

Homework:  Keep an eye out for more good cardboard

Class 20  Tuesday, 10/29
Warm-Up:

1.  What is the difference between a 2-stroke engine and a 4-stroke engine?

2.  At a similar horsepower, why are 4-stroke engines typically heavier?

Today:

• Test
• Cardboard car demo
• Get cardboard.  Laser cut and construct car bodies.

Handouts None

Videos:

Homework

Class 19  Friday, 10/25
Warm-Up:

Suppose we create a video of a coffee filter falling to the ground.  By analyzing the video, how can we tell if/when it has reached its terminal velocity?

Today:

• Check and review Practice Test (A5/6 gets another 10 minutes to finish)
• Preview of car project -- check laptops for Rhino installation.  Which ones are missing Rhino?  Will it open and operate?  Watch laser cutting in Fab Lab (D104)?

Handouts None

Videos:

Homework

• Bring in a piece of single-ply cardboard (about 3/16") from which a 7" x 17" rectangle can be cut.  Ideally, the grain of the cardboar should run in the long direction.
• Study for test.
Class 18  Wednesday, 10/23
Warm-Up:

1.  What will we see when the string labeled with a bold font is burned?
2.  What information do you need in order to give a better answer to question #1?

Today:

• View some videos from last class
• Rubber-Band Car Problems
• Newton's Laws Practice Test

Handouts

Videos:

Homework:  Complete Practice Test?

Class 17  Monday, 10/21
Warm-Up:
Suppose you find yourself stranded in the middle of a room because the floor is completely frictionless.
1. In this case, why wouldn't you be able to walk to the edge of the room?

2. Describe what you could do in order to escape.

Today:

Videos:

Homework

Class 16  Monday, 10/14
Warm-Up:

The diagram on the right shows a rubber band slingshot on a piece of wood.  When the steel ball is shot from the slingshot, what happens to the piece of wood?

Today:

Video and Handout:   Video:  answers to newton's laws textbook questionsquestions

Homework:  A5/6 -- finish 3rd page (#10-15) of Newton's 2nd Law Practice

Class 15  Thursday, 10/10
Warm-Up:

The Earth's orbit represents a "balance."  It does not fly away from the Sun, and it does not get pulled into the sun.

1.  What prevents the Earth from flying away from the Sun?

2.  What prevents the Earth from flying into the Sun?

3.  According to Newton's 1st Law, are the forces that are acting on the Earth balanced?

4.  When the pipe on the right is swung in a circle, what happens to the objects and string?

5.  This year, the autumnal equinox fell on September 22.  What does that mean?

Today:

• Review homework.
• Final rocket launch
• Use your rocket's video to determine your rocket's time aloft and terminal velocity.

Homework:  Complete Newton's Laws Textbook Questions

Class 14  Tuesday, 10/8
Warm-Up:

What made some rockets successful?  What made others unsucessful?  How might you make your rocket go higher and come down slower?

Today:

Homework:

1. Complete Practice Problem #2.  Click the link to see it.  It is on its own page.
2. Finish anything you didn't finish in class
Class 13  Friday, 10/4
Warm-Up:

An inch is 2.54cm.  If someone is 5 feet 10 inches tall (with shoes on), how many meters is that?

Today:

Homework: none

Class 12  Wednesday, 10/2
Warm-Up:  Read this rocket launch procedure.  Following this procedure will allow us to determine the rocket's acceleration, terminal velocity, and force.

In the classroom...

1. Record the empty (dry) mass of your rocket.
2. Record the water level to which you have filled your rocket (so that you can later determine water mass).

Outside...

1. Form a line
2. Remove the bottle cap before you approach the launcher.
3. Immediately before launching, have one group member stand beside (not in front of) the launcher (to allow scaling of the video).
4. Count down loudly and pull the launch cord gently.
5. The group member who stood next to the launcher before the launch must stand next to the fallen rocket after it has reached the ground (again, to allow scaling of the video).
6. Clean up the launch area.

Today:

• Review homework
• Launch rockets
• Clean up

Videos:

Homework: none

Class 11  Monday, 9/30
Warm-Up:

1. Can you balance a meter stick on your finger with the meter stick standing on end?

2.  If you tape a heavy weight to one end of the meter stick, will it be easier to balance with the heavy end touching your finger or with the light end touching your finger?

3.  Why?

Today:

Videos:  Newton's 1st Law Notes from last year Newton's 2nd Law Notes (also from last year)

Handouts:

Homework: Complete 1st and 2nd Law Practice

Class 11  Thursday, 9/18
Warm-Up:

I am going to put a big rock on my head.  Then I am going to put a piece of wood on the rock, and someone is going to hammer a nail into the wood.  Will this hurt me?  Why or why not?

Today:

• Return tests.
• Work on rockets

Homework:

Class 10  Tuesday, 9/24

Today:

• Mr. Stapleton still in Idaho.
• Construct rockets.
• Clean up and put things back
• Store your rockets in the appropriate bag.  Put usable spare parts in the spare parts bag.

Homework:

• Gather rocket materials (if there's something else that you need)
Class 9  Friday, 9/20

Today:

• Mr. Stapleton is gone to Idaho.  Ms. Serabian is here.
• Test
• Research and design rockets
• Turn in rocket design sketch sheet.

Homework:

• Gather rocket materials (if they are not provided) and bring them to next class.
Class 8  Wednesday, 9/18
Warm-Up:

It is possible to pull the paper out from under the pen without tipping the pen.  How can it be done?  Why does that work?

Today:

• Check and review practice test.  Test next class
• Remind me who brought in bottles.
• Introduction to rocket design -- make paper rockets.

Videos:

Homework:

• Study for test.  Review the practice test and all notes except for Newton's laws.

Class 7       Tuesday, 9/16/13
Warm-Up:

There is a heavy object tied to the ceiling with a string.  There is an identical string hanging from the object.  I am going to pull on the bottom string until one of the two strings breaks.  Which string is going to break first?  Why?

Today:

Videos:

Plan for the Week:

• Wednesday -- check/discuss practice test.  Make paper rockets.
• Friday -- Mr. Stapleton gone.  Test.  Research and design bottle rockets.
• Tuesday -- Mr. Stapleton gone.  Build bottle rockets

Videos:

Handouts:

Homework:

• Finish the practice test
• Test on Friday

Class 6 Thursday, 9/12/13

Warm Up:

What would happen if you made a hole through the center of the Earth, and you jumped in?  If you came out the other side, where would you be? (antipodes map)

Excel spreadsheet -- falling through the earth

Today:

• Return Quizzes
• Motion problems and calculating acceleration
• Work time.  1) Complete video analysis.  Staple your video analysis graph sheet to your logger pro graph sheet.  2) Complete the motion problems -- due next class.

Handouts "Working With Motion Formulas"

Video:  This is a great video explaining the entire motion formulas handout -- except for the fact that I accidentally had the camera in low resolution mode (long story).  At least you can hear clearly.

Homework:

Class 5 Tuesday, 9/10/13

Warm Up:

The sets of dots on the right represent frames of video taken of two different balls that are falling from the sky.  The video camera takes pictures at a constant rate of 30 fps (frames per second).  One of the balls is in free-fall.  The other ball is falling at a constant velocity.

1. Which ball is accelerating?

2. How can you tell?

3. What do you think "free fall" means, from a physics standpoint?

Today:

• Quiz -- velocity and acceleration
• Finish spool tractors; turn-in graphs of position vs time.  On your graph, show calculations for the velocity of your fastest run.
• Use slow motion video (and this spreadsheet) to create higher-quality graphs of position vs time and velocity vs time.  Use your velocity vs time graph to determine your spool tractor's maximum acceleration.

Homework: Look for 2-liter bottles!  Bring them to class.  Please!

Class 4 Friday, 9/5/13

Warm Up:

1.  A car circles a track at a constant speed of 70mph.  Is its velocity constant?

2.  Records of 132 cats that jumped from windows of buildings showed a 90% survival rate.  The average drop was 5.5 floors.

Injuries increased with increasing heights up to 7 floors. When cats fell from over 7 floors, they actually suffered from “less injuries.”

Why do injuries increase from floors 1-6? Why would injuries decrease at over 7 floors?

Today:

• Check/review homework
• Acceleration Notes  I put a video of these notes on youtube.
• Work on spool tractors; create graphs of position vs time.  Calculate velocities.  Print a graph for your fastest run.

Homework:

• Quiz next class over velocity notes and acceleration notes.  Know the answers to all of the questions, and be able to solve similar problems.
Class 3  Wednesday, 9/4/13
Warm-Up:  The graph on the right shows the positions at different times for seven different people.  On a sheet of paper, list all of the people who are...
1. moving at a constant speed
2. moving backward (toward the sensor)
3. not moving at all
4. accelerating
5. decelerating
6. accelerating the fastest
7. moving at the fastest constant speed

Today:

• Turn in course expectations signature if you haven't already.
• Does anyone have 2-liter bottles to turn in?
• Return papers
• Finish velocity notes
• Work on "spool tractors."  Try to achieve the highest measurable (with a motion detector) velocity.
• Next class -- calculate spool tractor accelerations

Homework:  Complete the last page of the velocity notes handout.

Class 2 Friday, 8/30/13

Warm Up Question:

When you throw a "frisbee," it is often advisable to tilt the fast side of the disc downward.

1. Which side is the fast side?   2. Why tilt it downward?

3.  Why is "frisbee" in quotation marks?

4.  What's the connection to the PVC pipes you saw last class?

Today:

• Warm-up
• Turn in course expectations if you have had them signed
• Motion matching activity
• Velocity notes
• Clean up.

Handouts:

Video:

Homework:

• **Get course expectations sheets signed and returned by next class.  (A56 can have an extra day.)
• We will be needing bottles in the near future.  Bring in 2-Liter bottles (or any other large bottles with caps that are compatible with 2-liter bottles -- must be for carbonated drinks).  They are not due next class.
Class 1

A-Day: Wednesday, 8/28.

Physics 100: Mr. Stapleton

Warm Up Question:

Spin one of the "sprotating cylinders" by pressing one end until it squirts out from under your finger.  Try pressing the other end.

When the cylinder is spinning, why do you only see the symbol that you press?

Slow motion

Today:

• Learn names/pronunciations
• Fill out info sheets
• Enter attendance
• Slideshow(s)
• Go over course expectations, class overview
• Mr. Stapleton background, philosophy, etc.
• Itroduction to lab next class: Motion Detecting, part 1 (matching graphs)

Handouts:

Homework:

• Sign and return course expectations by next Wednesday, 9/4.  Turn in the whole sheet.  If you need another copy, print one from this website. [I forgot to tell A5/6 to do this.  They can have more time.]
Unique Visitors:
carinsurance.info Page Views:
carinsurance.info