Momentum, kinetic energy and impulse can be used to analyse collisions between objects such as vehicles or balls. Forces and the final velocity of objects can be determined.

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Momentum is the product of a moving object's mass and velocity.

\[\text{Momentum} = \text{mass}\times \text{velocity}\]

The symbol for momentum is \(p\) so this can also be written as:

\[p=mv\]

Momentum is measured in kg ms^{-1}.

Momentum is a vector quantity that depends on the direction of the object. Momentum is of interest during collisions between objects.

When two objects collide the total momentum before the collision is equal to the total momentum after the collision (in the absence of external forces).

This is the law of conservation of momentum. It is true for all collisions.