**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**

- Momentum can be thought of a measure of how hard it is to _____________________ a moving object.
- Linear (straight-line) momentum is defined as:
- The greater the mass, the _____________________ the momentum.
- The greater the velocity, the _____________________ the momentum.

- An impulse is defined as a _____________________ applied to an object over time, resulting in a change in _____________________.This is shown as:
- Note that F
_{net}is probably not going to be _____________________ over time.

- Note that F
- Theory of _____________________ of Momentum:In a collision in an isolated system, momentum is always _____________________.
- An isolated system is a system in which there are no ___________________ ___________________.

- Proof:
- We look at what happens when a ball hits another ball
- According to Newtonâ€™s 3
^{rd}Law, when 2 objects interact they exert ________________ and ________________ reaction forces: - The impulse exerted on each object is calculated using ________________
- And therefore