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# Momentum

Linear momentum (or simply: momentum, $\vecphy{p}$) is the total quantity of motion of an object and involves both its mass and its velocity. It is a vector quantity.

A long cargo train experiences a greater "quantity of motion" (i.e. momentum) than a small passenger car moving at the same velocity.

Momentum is conserved. In other words, the total momentum of a group of objects before a collision (or some other interaction) is equal to the total momentum after a collision.

The momentum $\vecphy{p}$ of an object is given by the product of its mass $m$ and its velocity $\vecphy{v}$: $$\vecphy{p}=m\vecphy{v}$$

The unit of momentum is $\text{kg m/s}.$

Momentum is transferred when billiard balls strike each other. However, the total momentum is conserved.