Momentum. Momentum. Measure of Mass in Motion All Objects Have Mass If an Object is Moving, then it is a Mass in Motion 2 Variables How Much Stuff (Mass) is Moving How Fast (Velocity) the Stuff is Moving.
Think of a ball bouncing off a wall. It leaves the wall at the same speed as before. Let’s call going from right to left negative, and going from left to rightpositive.
The diagram shows two cars at a fairground, before and after bumping into each other. One car and driver has a total mass of 500 kg, while the other car and driver has a total mass of 400 kg.