Momentum is mass multiplied by its velocity or speed:
momentum = mv
Impulse is force multiplied by a time interval
impulse = (mv)
= change in
For example, if a car crashes into a bail of hay, the time of stopping is greater than if the car crashed into a wall. Therefore, the force is smaller because ther is a bigger time.
Implulse is greater when an object bounces, because time is smaller and force is greater.
Momentum cannot be created or destroyed, but it can be conserved (changed).
There are two types of collisions-elastic and inelastic. Object couple when an inelastic collision occurs. Objects bounce off of each other with no deformaties when an elastic collision occurs.
Momentum is a vector quanitity and can be combined following vector rules. The magnitude and direction of the final vector depend on the magnitude and direction of the original vectors.