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Chapter 7 and 8 by
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# Chapter 7 and 8

## Words of the Day

### Applicability

able to apply, what areas does energy apply

use for, non constant acceleration, final velocity, changes in position/direction

### Trust

firm reliance on the integrity, ability, or character of a person or thing

## Momentum

p = mv

### Conservation of Momentum

p = 0

If no external force acts on system, the initial momentum of the system is equal to the final momentum of the system.

## Three types of Collisions

### Completely Inelastic

Perfect Sticking

Conservation of only momentum

m1v1i +m2v2i = (m1 +m2 )vf

### Inelastic

“Sticky” but the bodies do not stick together

Conservation of momentum only

### Elastic

Perfect bouncing

Conservation of kinetic energy and momentum

m1v1i +m2v2i = m1v1f +m2v2f

## System of Particles

### Center of Mass

Average location of the mass in a system of particles

3D in general

### Motion of the Center of Mass

Definition of Momentum

Newton’s 2nd Law for Systems

## Angular Energy

k= 1/2*l*w^2

### Moment of inertia

Depends on mass and shape

## Rotational Dynamics

### Torque

Angular Force

Vector Quantity, T

Magnitude, T= -/+ F*D, T= F r sin X

F=0, Linear

T=0, Angular

### Rolling Bodies

Add translational and rotational kinetic energies

### Refer to page 258, Table 8.1

shapes

axis of rotation

rotational inertia