1. Conservation of Momentum - Definition
For a given interaction between objects, the net change in momentum is Zero. Or
Momentum is conserved.
(It don’t change)

2. Conservation of Momentum - Why is it conserved?B

3. Example: 60. kg Sally going 4
Example: 60. kg Sally going 4.5 m/s to the East collides head on with 80. kg Bob who is going 2.3 m/s West. What is the velocity of their embracing bodies? (0.61 m/s East)

5. + 3.2 m/s 1.2 m/s v = ? 5.0 kg 4.0 kg (Stuck together) Before After

6. + 0 m/s 0 m/s v = ? 3.6 m/s 13 kg 17 kg 13 kg 17 kg Before After

7. + 16.0 m/s 10.0 m/s v = ? 231 g 281 g (Stuck together) Before After

8. + 6.20m/s 1.20 m/s v = ? 13.0 kg 17.0 kg 13.0 kg 17.0 kg Before After

9. A 3452 kg truck going 23. 0 m/s collides with a 1253 kg car at rest
A 3452 kg truck going 23.0 m/s collides with a 1253 kg car at rest. What is the velocity of the wreckage just after the collision?
16.9 m/s

10. A 215 gram bullet going 542 m/s goes through a stationary 3
A 215 gram bullet going 542 m/s goes through a stationary 3.40 kg block of wood. After this, the block is traveling at 12.0 m/s in the same direction, (a) what is the bullet’s velocity?
352 m/s

11. A 215 gram bullet going 542 m/s goes through a stationary 3
A 215 gram bullet going 542 m/s goes through a stationary 3.40 kg block of wood. After this, the block is traveling at 12 m/s in the same direction, (b) if ripping through the block took s, what force did the bullet exert on the block?
1630 N

12. A 2450. kg airplane (including ammunition) going 52. 40 m/s fires a 5
A kg airplane (including ammunition) going m/s fires a kg shell forward at m/s. What is the velocity of the plane afterward?
50.65 m/s