Video Tutorials
![Picture](/uploads/2/6/2/1/26215381/crash-test_orig.gif)
Things You Need to Know
- Momentum (p) is basically a measure of "how hard to stop" something is.
- It's a measure of how much "oomf" something has.
- p = mv
- Units on momentum are kg ⋅ m/s.
- Impulse is the change in momentum.
- It is NOT the RATE of change of momentum. It's literally just "how much the momentum has changed.
- F(∆t) = m(∆v)
- "∆" means "change in".
- Units on impulse are N ⋅ s.
- Impulse's formula explains why cushioning an impact protects the object.
- Higher time means lower force, to keep your impulse balanced.
- In a collision or an explosion, the total initial momentum must equal the total final momentum. This is called the "Conservation of Momentum".
- In 2D collisions, you need to break this into x-components and y-components.
- Elastic collisions are where both momentum and kinetic energy (Ek) is the same before and after a collision.
- Inelastic collisions are where only momentum was conserved before and after a collision.
- Elasticity of a collision = (Final Ek/Initial Ek) x 100%.
Homework Assignment
![](http://www.weebly.com/weebly/images/file_icons/pdf.png)
Momentum and Impulse Homework | |
File Size: | 461 kb |
File Type: |