Introduction to Momentum

Learning Intention

• Learn what momentum means (in the world of physics).
• Learn how an external force can cause a change in momentum.

Definitions and Formulas

1. Momentum can be thought of a measure of how hard it is to _____________________ a moving object.
2. Linear (straight-line) momentum is defined as:
   1. The greater the mass, the _____________________ the momentum.
   2. The greater the velocity, the _____________________ the momentum.
3. An impulse is defined as a _____________________ applied to an object over time, resulting in a change in _____________________.This is shown as:
   1. Note that F_net is probably not going to be _____________________ over time.
4. Theory of _____________________ of Momentum:In a collision in an isolated system, momentum is always _____________________.
   1. An isolated system is a system in which there are no ___________________ ___________________.
5. Proof:
   1. We look at what happens when a ball hits another ball
   2. According to Newton’s 3^rd Law, when 2 objects interact they exert ________________ and ________________ reaction forces:
   3. The impulse exerted on each object is calculated using ________________
   4. And therefore