### Archive

Archive for January, 2012

## ReAssessment Notes

Just a few quick reminders:

• If you want to submit a reassessment, you must submit something within 2 weeks of the original assessment.  After that, if you still don’t understand the material, you can re-reassess.
• Peer review.  I said you need to have your screen cast reviewed by at least two other students.  I am not going to check this, but it is still a requirement.  I don’t want you sending me something that you haven’t had someone else go over also.  Trust me, this is good for you.
• If you have technical difficulties with screen casts, ask me for help.  If you ask me for help one hour before the screen cast is due, I will talk really slowly.
• VPython.  I still haven’t decided how to assess the vpython things.  They will be optional – in that your scores on vpython items will replace your other lowest scored standards.  For now, just pick some program to show a screen cast of – hopefully you will show a vpython program that can demonstrate your understanding.
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## Collision Example

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## Approximation for constant gravitational field

Here is a post you might like. It is an analysis of some gravitational wells.

Yes, I know. We haven’t looked at potential energy yet. However, this does show how near the surface of the Earth the gravitational force is essentially constant. Sorry, I thought I had a post that did the same thing with forces, but I was wrong.

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## An example of the momentum principle

This is very similar to the problems in the chapter 2 homework.

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## Quick Intro to the Momentum Principle

Maybe this is useful, maybe not.

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## Equations for Chapter 2

For Chapter 2, I would expect that you would know:

• The definition of average velocity
• The definition of momentum
• The momentum principle

I will give you the following equations (along with any constants you might need):

$\vec{p} = \frac{m\vec{v}}{\sqrt{1-\frac{v^2}{c^2}}}$
$\vec{F}_\text{spring} = -ks\hat{L}$
$\vec{F}_\text{grav} = m\vec{g}$
$\vec{g} = \text{} \text{ N/kg}$

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