1. Momentum & Angular Momentum

2. Momentum

4. Example on pg 178 in chapter 9 packet

5. Momentum Momentum is a quantity that is commonly conserved in an interaction. This means that the total momentum before and after an interaction (like a collision) does not change This is only true if there is no external force to impact the momentum of a system

6. Momentum With the conservation of momentum, we are going to solve multiple problems with collisions. There are two types: Elastic: the objects do not combine after hitting each other Inelastic: the objects combine after hitting each other

7. Momentum

8. A 2,000 kg train is moving at 20m/s down a track. It smacks into and combines with another train that weighs 1,500 kg and is at rest. What is their final velocity combined?

9. Momentum In your groups, try to solve the first problem on the worksheet

10. Angular Momentum

11. A supergiant star with a mass of 25M ʘ and a radius of 1,000 R ʘ has a linear rotational speed of 5,000 km/s. After the supernova explosion, it became a neutron star with a mass of 1.5M ʘ and a radius of 1.7x10^(-5) R ʘ. What is the linear rotational speed of the neutron star?

12. Homework Finish the last problem on the worksheet. Also try the extra credit. Then the homework is: Pg 178 # 1, 2 and pg 185 #5, 6, 7. #8 is extra credit (1pt)