**Impulse and Momentum**

**Momentum**

The momentum of an object is the product of its mass and its velocity. Momentum is a vector quantity and is measured in or

The equation for momentum is:

= momentum in

= mass in

= velocity in

**Impulse**

A change of momentum is known as an impulse. When a force acts on an object to change its velocity, the momentum of the object will change because the velocity changes. The equations for impulse are:

Another equation for impulse is:

**Example 1:**

What is the momentum of a 50kg girl walking north at ?

north

**Example 2:**

A 900kg car is travelling west at before coming to a complete stop at a red light. What is the impulse of the car as it stops at the red light?

. Note: we will denote west as positive:

Therefore, east