Capacitors Practice Problems

HW Due 6/9 Capacitors! practice

Capacitors DECODED

Ohm's Law Lab

Ohm's Law

FINAL EXAM ?s and answers

SENIORS FINAL ? list  MAY 30th!
3x5 card ok.
there will also be several 'lab practical' questions.

intro to Ohm's, 5/15

slide show NOTES from 5/15... it's rough... 
ohm's law in circuits wired in series.
other sources online OK... my notes, pretty standard explanation...
we'll come back to parallel circuits on Wednesday and Friday.

Lesson plan 5/17

Lab/ activity	Turn in...	Should be done by...
What do bulbs do to the moving charge? (Packet #2)	One ‘packet’ per team, attach computer-generated graph & data table.	DUE Monday, 5/15… If this is not done, you are now officially running behind!  Come into lunch or flex
HW READING BLOG		Beginning of period Wednesday
2.   What makes a charge move? (‘Section 3’)	everyone should do their own last page…   And turn it in SEPARATELY.  The rest of the packet is to be shared & kept in notes.	End of period Wednesday
3. HW: Series Practice questions	ONE PER PERSON!	Beginning of period Friday
4. Electricity Exploration #3: parallel circuits	One per team	DUE beginning of class Tuesday 5/23

Cleveland is....

PADLET #1:  

PADLET #2 

Electricity Exploration follow up AND Electrostatic Forces

Lesson Plan for 5/5

PLEASE FOLLOW THESE ACTIVITIES IN THIS ORDER.   DUE Tuesday, 5/9

I. Finish Electricity Exploration #1.  Do NOT start #2.  

If you were gone Wednesday, please spend today doing Electricity Exploration #1- do NOT copy a friend's lab. 

II. Watch how a light bulb works videos.  (focus on incandescent, filament bulbs for now)

     best I could find:      1. "I didn't know that" on Light bulbs             2. Naked Science Scrapbook

                             Bonus: Good comparison between different types of bulbs.  (just for fun)

III. Turn in Electricity Exploration #1 into the turn in Box.  One per person. 

IV. Pick up a Coulomb's law and electrical field HW packet.

Use your text book &/or online research to find background information on Coulomb's law, page 1. Practice using this law on page #2.

      DO NOT DO HW assignment on pages 628-655.  These pages will replace it. 

      THIS PACKET IS DUE TUESDAY!!!

V.  Watch CRASH COURSE VIDEO: Electric Fields... to answer pages 3&4  I'd put on the captions and stop it A LOT.   

VI.   Open up Phet Simulation on Electric Fields to answer questions on pages 4 &5.

VII. Bonus friday Physics Fun! 

         PhET electric hockey

         Kemper's favorite graph 

         (extra credit if you can explain why most ocean  beaches are     

         sandy not muddy.  must refer to this graph and electrostatic 

         forces). 

         Ben Franklin & Electricity... a bit of History 

Static Charge SIMULATORS

LINK TO JOHN TRAVOLTAGE (pHet)

LINK TO ONLINE SIMULATIONS OF STATIC CHARGE (pHet)

HW: Due Thursday 5/4
1) fiddle around with online static electricity simulators-
think about what is moving where and why.
What objects allow for the build up of charge? Which don't?

2)  See this blog entry.  Please do NOT do questions below.
 due Monday, 5/8
from the text book: READ pages:   628-633
PRACTICE PROBLEMS  pages 654-655, #1, 2, 3, 17 AND 18.
(You might have to review the meaning of atomic #s to be able to do one of these problems.  It is expected that you review this information independently to do this problem).

Triboelectric Series

Answers to Review questions for 5/1 test

Waves... review 2

Textbook photocopy
Chapter 13:
page 493, #3
page 499: #2
page 503 #2
reading: pages 504-505
page 507; #13, 14 & 15

Chapter 14:
page 523: #2
page 548: #4

Chapter 15:
page 567: Practice 5A 1-3, and review 1-3
page 585: #1
page 587: #16

DUE Monday, 5/1
QUIZ CLOSED NOTES OVER THE SAME QUESTIONS
QUIZ WILL FOCUS (ha!) ON OPTICS more than SOUND.... b/c we've already had a quiz on sound.... so... big big big hint.... quiz will put emphasis on Chapters 14 & 15...

POLARIZATION reading

READING: Polarization

Snell's Law Lab

Snell's Law Lab
Big hints:
1) easiest to calculate sine of angles in a calculator, then create your data tables in excel
2) n = sin theta i/ sin theta r... x-axis is to be the denominator & y-axis the numerator in that equation.... see in class notes for more detail.

Wave Application Presentations

WAVE application presentations: explanation

Wave interference pHet

PHET demos
this requires java.
and won't work on some Macs or Chromebooks
it is safe to download.

https://phet.colorado.edu/en/simulation/wave-interference

a few examples of instruments... just in case

Speed of Sound LAB

U.S. Navy F/A-18 approaching the sound barrier. The white halo is formed by condensed water droplets which result from the shockwave shedding from the aircraft (see Prandtl-Glauert Singularity).^[1][2]

Using sound tubes to measure the speed of sound in air

Use a sound tube-water-tuning fork system to measure the speed of sound in air.  For best results you should do trials for at least 4 different tuning fork frequencies, and use a graph of these data to generate a value for the speed of sound in air. In your write up you should include a schematic of how a standing wave resonates in a sound tube for the fundamental frequency.  In addition, please include your data table of measurements, and extensively show your calculations for the speed of sound in air.  You should be able to include this on one page.  

IB Assessment: Data Collection and Processing, Conclusion and Evaluation

HW for Friday, 4/7

HW problems: from the text book, due 4/7 Friday!
page 508 #31, 40, 41, 42, 43, 44

you should also be familiar with
previous HW handout [adapted from pages 470 # 27, 37, 39, 40, 42, and 48 in the Text].
There will be a quiz Friday.

Sound waves and resonance

These will be part of Tuesday, 4/4 lecture.

Resonance: more explanation

Several links we'll look at in class:

Garth Brook's 'Shout' January 2009
Originally live on HBO,
edited and reposted by John Huntington

Film Still from the Tacoma Narrows Bridge twisting Nov. 7, 1940
Created by Farquharson

Resonance & the Tacoma Narrows Bridge

Physics WAVES and more Videos- Fun Friday

Fold  a sheet of note paper in half, make one column for "connections to physics I've learned"  and another for 'totally new to me physics'.

Then watch the following videos.... if you want... you can play them twice.
This assignment is due at the end of class on 3/24/2017 (unless you have an excused absence, and then, please complete it before you return).  Aim for 10 connections to previous physics and 5 new to me ideas TOTAL for all Videos combined.

VIDEO #1: Your Microwave to find the speed of light

VIDEO 2: CrAzY PoOL VoRtEx

VIDEO 3: Stacked Ball Drop (and supernova explosions)

Waves practice HW answer key

Waves Practice #1

HW Waves Practice #1
due Friday, 3/24/2017

LAB: Making some noise

LAB: Making Some Noise

Dizzy Gillespie 
one of the founders of Bebop
composer, trumpeter, bandleader

Waves! intro

1839 woodblock print

 The Great Wave of Kanagawa, Katsushika Hokusai

WAVES! introduction

Longitudinal & Transverse Waves animation

water waves are a combination of longitudinal and transverse waves: animation

tsunami wave animation- note that frequency stays the same but wavelength and velocity changes.

Equations Thus Far...

This exact list  of equations

will be available to you for the Simple Harmonic Motion test.  If you see anything you'd like to have, but think I've missed, let me know.

This is a Webcomic created by and available under Creative Commons from Abstruse Goose,
http://abstrusegoose.com/275

TEST REVIEW QUESTIONS, SHM test

The Simple Harmonic Motion Test will be on Thursday, 3/16.  Here are the review questions.


All equations on the review sheet & in the SHM spring lab will be given to you for the test.

answers to SHM

ANSWERS TO THE REVIEW QUESTIONS

Simple Harmonic Motion- intro

PHYSCLIPS Video Intro

Simple Harmonic Motion (modeling springs in Excel) response questions

Excel Spreadsheet Blank for Modeling the Position of an oscillating mass on a spring

DIRECTIONS for Creating your OWN model of simple harmonic motion.

Here are the follow up questions to the SHM lab.
These are to be answered solo- your computer generated models and graphs should be checked off by me and may be done with partners.

Uniform Circular Motion LAB

For our class, we have generated class data.  
Please use the PRINTED OUT graphs passed out during class time for your write up.
You should analyze BOTH graphs even though your group contributed data for only one of the two. 

ORBITAL MOTION LAB: Class data set version

An equation that describes uniform circular motion does so in terms of centripetal force,

a_c=v²/r

where v is orbital speed and r is the radius of orbit.  This equation can also be expressed in terms of the circumference (2pr) of the orbital period (T).

a_c=(4pi²r)/T²

Using the class set of data below, can you verify these two important mathematical relationships that characterize centripetal acceleration?

QUESTION #1: Can you show that a_c is directly proportional to r?  

Is that proportion similar to this equation? a_c=(4pi²r)/T²

QUESTION #2: Can you show that a_c is inversely proportional to T²?

Write a caption under each graph. 

Write a conclusion answering the two questions above.

Include a BRIEF description of your methods AND an analysis of sources of error in your conclusion.

Centripetal Motion & the Death Spiral

Meagan Duhamel, Eric Radford
2nd in pairs figure skating team event
photo snagged from CBC Canada

A pairs figure skating move- the Death Spiral.

We'll use this as our warm up question on centripetal motion on 2/21.

http://www.youtube.com/watch?v=H3T5A4WsWCQ

MANY OTHER CENTRIPETAL MOTION PROBLEMS & an explanation of their  solutions can be found HERE.

Circular Motion Lab: DATA collection

Please enter your group's data 
onto this spreadsheet.
Then enter your data into Desmos & find the best fit for your data.

HW and definitions Circular Motion

Earth and Moon together as seen from space.
Circular motions: Earth & Moon around the sun.
Moon around the Earth. Earth around the sun.

Going around in circles! From HyperPhysics.com,
here's a few diagrams with the equations we discussed in class.

Wikipedia animation of a radian
Here's a link to the Coriolis Demo

HW: page 247, #1, #3, #4; page 248, #1, #3, #4 AND page 250 #1 and #3.

Final Exam Review Answer Key

Key, final exam review

1. look these up   

2. see lab work and HW for help  

3. -9.8m/s^2  

4. a) -2.5m/s  b) it is constant, -9.8m/s^2    c) 0.25sec   d) 0.32m     e, f, g) see lab from first semester

5. 131N

6a) 0.55sec   b)0.22m

7.a) see chapter 4, Free body and force diagrams   b) >98N

8. a) 225 Ns    b) 4.5m/s    c) 506 Joules

9.  1125N

10. a) 4.5m/s^2  b)0.63 s

11. 0.15 Joules

12. a)441Joules  b) 0.78 sec   c) 7.7 m/s   d) 441 Joules

13. a) 29.4N    b) 0N

14. a) 12N    b) kinetic    c) 0.4

15. a) 25.5N b) 14.7N  c) static
NOTE: if this is on the final, I'd include a diagram of the ramp and ramp equations.
16. a) m1v1’=-m2v2’   b) 0 Joules     c) -13 kg*s   d)50s
17. 77.6m  
(this problem will NOT be on the final IN THIS FORMAT- it combines about all of the physics of semester 1 to solve this- if you can solve it, you're going to ace the final.  If it is on the final, it'd be broken down into about 10 smaller questions... PE at top gives you total ME through out, then calculate force of friction and work done by Friction- note slope here, and work done by increasing PE by going UP small ramp, use that to find jump velocity, then this is a 2d kinematics question w/ horizontal and vertical velocity from ramp jump velocity at an angle... to determine that the skier lands 77.6m from the ramp.... phew.)

!!!More Work (and Energy)!!!

perfect topic for the end of term, isn't it?
MORE work and ENERGY.
HW assignment due 1/27, Friday

Puck Lab

Here's the video we'll analyze in class on 2/7

Semester 1 FINAL Practice Problems

Parkour photography by Johnathan Lucas

SEMESTER 1 PRACTICE PROBLEMS

Equations we've used this semester.  
This list will also be given to you on the day of the final.
Please let me know if you see any equations missing from this list.

STUDY WELL.

ANSWER key for Newton's Law (chapter 4) HW

See question 9b.
Birthday cake.
Forces.
Life in Balance. 

Here's the key for Chapter 4 questions. 
THERE WILL BE A QUIZ MONDAY, 1/23.

Impulse & Momentum

Overview: Impulse & Momentum (Physicsclassroom.com)- very similar to lecture given in class on 1/19/2017.

First assignment: Momentum Master Equations

Second Assignment: Impulse & Momentum Practice Problems

WHAT IS A "MASTER EQUATION"? 
these assignments are asking you to manipulate the conservation of momentum equation (m1v1+m2v2 = m1v'1 + m2v'2) so that any variables that can be crossed off or simplified based on the initial and final conditions. 

For example,  
Write a master equation for this scenario:
2 carts have equal mass.  One is pushed and collides with the second cart, which had been at rest.  
You don't know the actual mass or velocities, but you are to simplify the expression to create a 'master equation'.

m1v1 + m2v2 = m1v'1 + m2v'2
we can eliminate several parts of this expression because of the conditions outlined above.

before the collision:
the second cart is not moving before the first cart hits it, so, v2 is 0, so m2v2 is also 0.
the initial conditions can be simplified to:   m1v1

after the collision,
the carts stick together, so they have the same velocity.  v'1=v'2
they also have the same mass.  m1=m2 
so the after the collision side of this expression can be simplified from m1v'1 + m2v'2 
to 2mv'  (2x mass of cart 1 X final velocity).

The entire master equation for this collision is:
m1v1= 2m1v'

HW: Chapter 4

You might not recognize this,
but, we do in fact have a text book.

questions due 1/12
pages 151-157
#6, 8, 9, 10, 23, 24, 27, 55, 56, 59, 67

HERE IS A LINK TO PAGES 151-157
(none of the questions is on page 156, so I didn't scan that one).

Quiz the last half hour of the period on 1/12.
These questions with only numbers and names changed to protect the innocent.

ASE Summer Internships through Saturday Academy.

You should apply.
Really.
Great.
Opportunity.
Also go to a winter info session before the March deadline.

Coefficients of Friction and some other random frictional accounts

This posting is just for the curiosity factor.

First, here's a list of some coefficients of friction. (mu).

Each year, scientific studies are nominated for Ig Nobel Awards- which "honors achievements that cannot or should not be reproduced".  In 2003, the winning study was titled "An Analysis of the Forces Required to Drag Sheep over Various Surfaces."  

sheep found 2000m above sea level in a New Zealand snow storm,

being dragged to safety.

Friction Lab

Friction Lab Directions & Write up Explanation

measuring the coefficient of friction along a conveyor belt.
http://www.drylube.co.uk/customers/measuring-coefficient-of-friction/

And... because it looks like F=uN, doesn't it?