Momentum

Unit: Momentum

Today, the lab was done on the air table, mapping out collisions with dots and using that information to calculate momentum problems!
 * Friday, May 6th: Physics Air Table Lab**
 * Danielle Hemet**

Here are some examples of elastic and inelastic collisions, just for fun! [] []

Momentum Lab Marking Scheme (we got it in class) in case you lost it...

1.) Straight line paths connesting dots drawn 2.) Calculation of average speed of each puck before and after collision 3.) Calculate P ﻿a P b P a ' P b ' 4.) Scale indicated for vector drawings 5.) Momentum vector for each puck is drawn on the sheet 6.) Addition of momentum vectors before and after the collision (include labels and magnitudes) 7.) % difference calculation for Ptotal and P'total 8) Kinetic Energy Calculations 9.)Characterizing the collision 10.) Other forms of energy 11.) Work is done neatly and laid out in a logical manner Just make sure you have all these things and you're good!
 * vector diagram
 * calculation of Ptotal, P'total
 * of each puck
 * netE and netE'
 * % Energy retained

HMWK: Momentum Lab is due end of class Monday, we'll have at least 45 minutes to work on it. Also, Conservation of Energy-Review Problems also due end of class Monday. Good Luck! :)

 Monday May 9, 2011  Becca Bleskie

Today we had about 45 minutes to work on our air table experiments and the problem sheet. We also started talking about simple harmonic motion, and then we finished with a video on string theory.

__Simple Harmonic Motion (SHM)__

Here is a video to help you visualize the positions of the spring!

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> > >
 * **Without a mass on it, the spring will be resting at the unstretched position. **
 * **With a mass on it, the spring will rest at the new neutral, or unoscillated, position **
 * **If you were to pull on the mass, it would bounce around the neutral position, and the only forces acting on it would be FG and FT. The force of tension is known as the restoring force Frestoring. **
 * **SHM: any motion where the restoring force trying to bring the object back to the neutral position
 * this allows the object to bounce back and forth once it is displaced

>
 * **How it oscillates is determined by mass, constant, and the pull on the object **
 * **How it oscillates is determined by mass, constant, and the pull on the object **


 * Wednesday May 11, 2011**
 * Becca Bleskie**

__Simple Harmonic Motion (continued)__

constant value for the slope is F R ﻿/Δ x=K

Generally, **F R ﻿=KΔ x**

The area under the graph is energy: 1/2bh=1/2F R ·Δx

__**F R ﻿=K<span style="font-family: 'Times New Roman',serif;">Δ x:**__

Energy stored in spring: Ee=1/2F R <span style="font-family: 'Times New Roman',serif;">·Δx <span style="font-family: 'Times New Roman',serif;"> =1/2KΔx·x <span style="font-family: 'Times New Roman',serif;"> =1/2KΔx 2

__Static Experiment:__

Since Fs=Fg in this case, Kx=mg. Using this, you can isolate to find K!

The period equation for an oscillating spring is: **<span style="font-family: Times New Roman,serif;">T=2Π <span style="font-family: Times New Roman,serif;">√m/k ** --> rearrange this for K=_____________


 * __For Friday:__**
 * __Each__ person needs 2 neatly drawn, completed tables
 * these will be marked on Friday
 * the 2 tables should be the only thing appearing on your page!