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Ch. 7 Momentum
by emily esser
# Ch. 7 Momentum

## Linear Momentum

### vector Quanity having same direction as the velocity

### The vector of p = mass times the vector of velocity

### The momentum and changes of two objects are always equal and opposite

## Momentum

### Vector quanity

### For momentum to be Conserved these things must be constant

### Mass and velocity involved

### Conservation

## Collisions

### Completely Inelastic

### Inelastic

### Elastic

## System of Particles

### Center of Mass

## Problem solving: Collisions

### Draw before and after diagrams

### Collect and organize data on masses and velocities

### Set the sum of momenta of the two before the collision = to the sum of the momenta after the collision

### Write one equation for each direction

### If perfectly inelastic set final velocities equal

### If perfectly elastic set final kinetic energy equal to initial kinetic energy

### Solve for unknown quantities

## Words of the Day

### Transpicuous

### Trust

### Woolgathering

### Applicability

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Magnitude

Direction

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

“Perfect Sticking”

Conservation of only momentum

m1v1i +m2v2i = (m1 +m2 )vf

“Sticky” but the bodies do not stick together

Conservation of momentum only

“Perfect bouncing”

Conservation of kinetic energy and momentum

m1v1i +m2v2i = m1v1f +m2v2f

Average location of the mass in a system of particles

3D in general

Motion of the Center of Mass

Isolated system moves at a constant velocity