Finding the momentum of an object is easy if you know the mass of the object and its velocity. The momentum of an object is a vector quantity that depends on the mass and the velocity of the object. Since we already used the letter *m* for mass, we use the letter *p* to represent the momentum.

## Finding the Momentum of an Object

To find the momentum, simply multiply the mass times the velocity.

\(\color{black}{ \vec{p} = m \vec{v}}\)

Note that this is a vector equation. The mass is a scalar. When we multiply it by the velocity (a vector) the result is a vector quantity.

Since momentum is a vector quantity, it can be broken into components. As always, we usually choose our coordinate system in a way that simplifies the problem. If you have an object moving in a straight line, you usually choose that direction to be the x-direction.

## Units of momentum

We simply multiply the mass and velocity of an object to find the momentum. This means that the units for momentum contain a mass unit and a velocity unit. If you are measuring in standard SI units, the units for momentum would be kg m/s.

There is no special name or symbol for this unit. Make sure that you don’t accidentally square the seconds. That would turn the combination into a newton. Remember, Newtons measure force.