The Force Awakens!

Unit Three - Forces

Major Topics

• Newton's Laws
• Weight vs. Mass vs. Inertia
• N3L forces vs. Balanced Forces
• Solving problems in 1 and 2 dimensions (inclined planes...)
• Tension and Atwood Machines
• Friction
• Circular Motion and Centripetal Force
• Springs in series and parallel (Hook's Law)
• Velocity dependent forces (air resistance...)

Experiments and Labs:

• The Big Push: Human Car Acceleration ( see previous post for data)
• Atwood Machines 
• Springs in series and parallel (Hook's Law)
• Flying Pigs and Centripetal Acceleration

The BIG Push !: Pushing Me Around!

Okay mostly in a straight line.

Exp 4:   Newton's Second Law of Cars

Today we accelerated my car ( and me) by pushing with the different combinations of people.
We measured that the ratio of Actual Push versus Push measure in lab was 0.40.
We accelerated the car with constant (?) acceleration for 10 meters and measure the time of the push.
To do:
Download the data to your computer by clicking here.

Open the Excel file or import into graphical analysis and add the following columns:  
Est. Force in Newtons.      Acceleration     

Use this data to graphically find the mass of my car.   
Show examples of each calculation.
Consider how many significant figures are really justified by our estimates.  
Consider the range of uncertainty  of each measurement. 
Comment on:  the accuracy of our approximations.  Was the acceleration constant.  Research the actual value.

Athletic Projectiles! ( new HW from the book)

Chapter 4 Problems  14,41,49,51,55*, 79,80, 82

For each of these problems: draw a picture, show the set up, show the relevant equations, then Show all work needed. If you get stuck, try a different approach. Still Stuck- move on and we can problem solve on Monday.  

Projectile Motion (2-D) has arrived

Projectile Motion Lab:

You self designed PML should be underway with data analysis and problem solving.
Remember, your goal is to conduct as complete analysis as possible for motion in 2D.
 Include:
 •Detailed tables containing all relevant data.  
•Graphs of  X vs. time,  Y vs. time and  trajectory graphs Y vs X. 
•Presentation of how you found and calculated the initial velocity and launch angle. 
•*If you can or if you are doing the "standard" approach you will need to present a graph of:
 Range (x) vs. sin2θ checking your datas approximation to the range equation.
Analysis:
•Using your data try to use it to answer some interesting questions (i.e. that are interesting to you)

We will discuss how your lab report will be Concluded in class Thursda, 10-10.

NEW QUEST ASSIGNMENT POSTED:  9-29   DUE10-6 
       "2d motion: more vectors and projectiles"
Work with me and with each other on solving these problems.  
Remember to work them in your notebooks with work clearly shown and organized.
You play as you practice. 

Fridays: Rocket Problem

Here is the rocket problem from class. I will post answers on Tuesday pm. 

In the meantime keep trying to solve it and try the extensions below.

extensions:

c.  What will the maximum height of the rocket be when it begins to descend?

d. How long until it stops climbing after the motor stops?

What is next?  

Practice Quiz on Monday

Real one on 1-d motion on Wednesday.

Lab: Acceleration down a ramp

Today we measured the velocity and position of a cart on a ramp.
We measured the height and length so that we could find the angle of incline.

The Goals was to gather data to prove:
• that the acceleration of the cart was constant acceleration
•  to compare the acceleration we calculated with the theoretical component of the acceleration due to gravity.

For each of 2 trials your data table should include:
a.Height=
b.length=
c. acceleration from line of best fit for the portion of data with straight line for V.
d. Position, X and velocity, V data for the relevant section of the plot.

For each trial you should perform the following "processing the data":
Calculations:
 1. theoretical acceleration from ramp angle and components of g.
 2. Plot a graph of velocity squared,v² versus displacment,x and calculate the acceleration from the slope.    

Compare your calculations of acceleration, account for difference and determine if acceleration down the ramp is constant.

Try to have this done by friday. good luck.

Your QUEST for Wednesday 9-16

The second quest assignment : Kinematics 2 is  long one.
Do your best to get what you can done.  Come with QUESTions.

We will spend a little time going over some of your questions.

For Thursday September 10

Terminal Velocity Lab-

•Please have your report ready for Thursday class.
You should have perfect graphs illustrating (proving?) what you think to be the basic relationship  between mass and terminal velocity.    Try to propose a simple mathematical relationship between them.  i.e. an equation.

HW

•Also finish those 2 HW problems from chapter one of your text : Q42,43

Downloading Loggerpro3 and Graphical Analysis from Vernier

Logger Pro 3

Use these links to install data collection and graphical analysis software from vernier on your  home computer or lab top.  Wilson has a site license so students can download this for FREE. You will need to give the password that I give you in order to download this software.

Logger Pro 3.9 with sample movies (Windows)
Link: http://www.vernier.com/d/2ywde


Logger Pro 3.9 with sample movies (Mac OS X)
Link: http://www.vernier.com/d/reipj

Graphical Analysis 3

Instructions

1. Download the Graphical Analysis installer on your computer
2. Run the Graphical Analysis installer
3. When prompted for a password, type ______________

• Windows (9.37 MB)
• Mac OS X (13.1 MB)
• 
  

Hitting the Ground Running!

Welcome to AP Physics!

Have you heard of the saying "Hit the ground running"? Do you know where it comes from or why it is a good idea?   Turns out there is a lot of physics there.
You are going to have a great time this year being challenged to think and problem solve. I can't wait to explain to you all that we are going to do.

First Things First!

Making a Homework Account

We will be using an online AP Physics homework data base.  It will allow you to check your answers and at times be able to see worked out solutions to your homework problems. It will also keep track of how many times it took you get the correct answer.

 Go to this link and start an online homework account. Click on "log in to Quest" and then choose the small print "I need a UT EID" under the login button. In the next window choose "get a UT EID". Answer no to all the questions. After you submit your information it will send your ID code to your email account. With this code you will sign in to my class and start the first assignment. You may proceed to sign in now or bring your EID code and password on Thursday. On Thursday we will log in as a class, I will start accepting your enrollment and we will start the first assignment.

This is how to sign in:
Return to the link above and log in.
You will then need to select a class based on a unique number. For Wilson AP Physics the unique number is 33133.  Enter the number 33133 and then select look up course info. Scroll down by clicking the arrow on the window that appears through the any other classes designated with that unique number until you find :

Ap-physics

33133

Wilson AP Physics C: Mechanics 2015

Duchow-pressley

MWF period 5

1

It will probably be one of the last ones. Select it and then select “request enrollment.”

I will have to admit you into the class. The next time you log in, after I admit you, you will be able to use the "select course" and "select assignment" windows to start the Kinematics homework. 

End of year PHUN!

AP Physics BBQ/End of Year Party

Let's celebrate the end of a full and fun year.

DP/s House

9414 SW 8th Dr.

off Orchid and Terwilliger.

Behold THE Exam Man Cometh

AP PHYSICS REVIEW PLAN 2015

Wednesday 4-29

-REVIEW:       FRQ -GravityEnergy and Momentum 1994M3

                        Questions on Quest Assignment

Assign:            FRQ: Gravitation and Satellite Motion

                        Equation Roundup

                        Free Response Exam 2014 for practice/HW

Friday 5-1

Test:                    MC (only) Gravitation and  HM

Review:              Score and go over test answers in class.

Monday 5-4

Review:             2014  Exam FRQs

Assign:             2012 Exam Frq

Wednesday 5-6

Practice Test:              Full  MC Exam

            Score and review in class

Friday 5-8

Actual Final Exam Part I: Multiple choice part only

Monday 5-11

AP Physics Exam  2015  @Marshall HS campus site

           

Homework Housekeeping

Due dates for recent assignments -- Look at them closely

 Labs
•Puck Lab: Cons of P and E    Due Monday 3-16-15

•ªPARK LAB:  Rotational motion/Merry go rounds and Seesaws   Due 3-20
Park Lab Data for Seesaw and Merry go round
Park Lab report guidelines

Homework

•Chapter 12 problems:  Q 63,65,66,74,79   Due Friday 3-13-15

•Chapter 12 challenge problem  Q83   Due Friday 3-13

•Quest Assignment: Rotations 3   Due Friday 3-13 (accepted until Saturday)

•New Quest Assignment:  Rolling & Angular Momentum  Due Wednesday 3-18-15

Unit Test

TBA - You know it is coming


 PLEASE COME TO CLASS WITH QUESTIONS ON WHAT YOU ARE STRUGGLING WITH.

Playground Experiment .. Documentation

Very Happy Physics Students at Custer Park  March 6, 2015

                     Right BACK at ya!

Hang on! 
Lets take this thing for a spin.

Hey, where is Britta?   
Oh there she is!

Phew!  THAT was close!
Everybody still happy!

Playground Physics Lab

Meet at Custer Park       Don't forget permission slips and medical forms

SW 21st and Capital Highway 

815 am Friday period 5   March 6

•Dress warm, grass will be dewy,  gloves? for cold metal

•bring supplies, phone timer, calculator, lab notebook etc.

Wilson AP Physics :    PLAYGROUND PHYSICS

OBJECTIVES:

To make accurate measurements of rotational motion in a neighborhood park

Specifically :

SEESAW

1.     Determine the mass of a seesaw.

2.     ?

Merry-go round

1.     Determine the Rotational Inertia, I and the Mass of the spinning disk

Measure the change in angular velocity ( angular acceleration) caused by several tangential forces applied to the edge of the spinning disk

2.     Determine Frictional torque and force on the axle of the spinning disk

Measure the angular acceleration caused by that friction

Swinging Tire?

New Logger Pro links

I had to remove the links but I can send them to you if you email me.

Review for the 1st Sem Final

Here is a link to the AP Physics C Course Description.  On pages 16-25 they list the learning objectives in careful detail - a giant list of what we should learn in this class, and the only real list of what concepts and problems might be on the test.  We have covered sections A- D at this point.

http://media.collegeboard.com/digitalServices/pdf/ap/ap-physics-c-course-description.pdf

Here is a link to a site with numerous practice tests, each 2-20 MC questions about topics of a particular type.  After you do the questions they will show you solutions.  It will ask you many times to sign up for their tutoring services, but it never seems to require you to do it.

http://www.varsitytutors.com/ap_physics_c_mechanics-practice-tests

As always the link to the practice AP FR questions remains a good source for practice with answers, and there is the new set of homework questions.


You can also use UT quest to make a customized review set of questions, focusing on all of the homework questions that you missed the first time around.  Follow these steps  (copied from their help menu)

• Customized Review 
• To help you review for an upcoming test, use the Custom Review option to create customized reviews that focus on your weakest areas. Choose Grade Summary from the left menu, then the Grades by Subject Area link to see the Custom Review option. 

Behold the End Middle is Near!***Attention: Edited Posted"***

Your New End of Term Quest... should you choose to accept it.
****
Please log into Quest to see 2 new shorter assignments:
•Center of Mass/Simple Momentum   Due Friday 1-23
•1st Semester Review  Due Friday 1-30    NewNewNew!

Lower Priority•Power and Potential Curves    Due Tuesday 1-24

Both of these are due soon. Be prepared to discuss these on those due dates.

Momentum going into the New Year

Let's pause for a Momentum:   
New Unit integrates with the Old

We are starting our unit on Momentum because it adds another tool to our toolbox for solving motion problems.  We are not leaving behind Conservation of Energy but will integrate them into our problem solving regimen. 

Look for a New Quest Assignment on Momentum!

XC Lab or replacement lab option.
•From our Arrow/Block Ballistics Demonstration: Use video analysi on Logger Pro to determine the Initial Velocity of the Arrow before it hit the block.
•Conservation of Energy and Conservation of Momentum must be used together.

 Arrow/Block Ballistics Video


Recent Homework:   Check scoring

2FrQ :  2003/1990?(loop the loop)   Due: 1-12

2 more FRQ:  2014/1995     Due 1-21

Recent Labs:    Conservation of Energy lab: Rolling Stones: Ramp to Rug