1. Conservation of Linear Momentum

2. Law of Conservation of Linear Momentum
𝑝 = 𝑝′
If the net force acting on a system of interacting objects is zero, then linear momentum of the system before equals linear momentum of the system after

3. Conservation of Momentum
Momentum in Space
Summary

4. Derive Cons of Linear Momentum from Newton’s 3rd
𝐹 2→1 = −𝐹 1→2

5. Momentum is not conserved when…
It is not an isolated system
We must consider everything that is moving or involved in the system
For example,
A ball is bounced on a desk!

6. Example
A 135kg man walks off a stationary 2.10kg skateboard. If the man moves forward with a velocity of 0.263m/s, how fast will the skateboard move?

7. Example
Tony (m=60kg) and Sifat (m=90kg) are playing football. Tony is running with a speed of 2.1m/s when he is hit by Sifat moving at 3.6m/s in the opposite direction. If Sifat maintains his tackle (they get stuck), how fast will they be going?

8. Homework
Pg 245 Q 2,3,7,9