# Is direction a factor of calculating momentum?

It depends on what you're after. Momentum is the product of mass times velocity. Mass is a scalar quantity, but velocity may be treated as either a scalar or vector. "Vector" means that it has a direction. This matters if you're calculating how billiard balls will interact, but not so much if all you're doing is throwing one.

### Momentum has direction because what has direction?

Momentum is mass x velocity; velocity has a direction, therefore momentum has a direction. Momentum is mass x velocity; velocity has a direction, therefore momentum has a direction. Momentum is mass x velocity; velocity has a direction, therefore momentum has a direction. Momentum is mass x velocity; velocity has a direction, therefore momentum has a direction.