# Momentum

We’ve talked in some depth now about motion, specifically trying to relate what we know about motion back to kinetic energy. Recall our definition of kinetic energy:

Kinetic Energy -- the ability or capacity of a moving object to move another object.

And the key characteristics of kinetic energy, mass and velocity, which can be observed from the equation: .

But, there’s more to the story. We’ve talked about moving objects causing other objects to move, but we really haven’t looked at those situations yet -- to do so we need to talk about collisions, and collisions are all about momentum.

### Objectives

1. Define and calculate the momentum of an object.
2. Determine the impulse given to an object.
3. Use impulse to solve a variety of problems.
4. Interpret and use force vs. time graphs.
5. Apply conservation of momentum to solve a variety of problems.
6. Distinguish between elastic and inelastic collisions.
7. Calculate the center of mass for a system of point particles.