Conservation of Momentum - Definition

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Presentation transcript:

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)

Conservation of Momentum - Why is it conserved? B

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)

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

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

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

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

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

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

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 .0250 s, what force did the bullet exert on the block? 1630 N

A 2450. kg airplane (including ammunition) going 52. 40 m/s fires a 5 A 2450. kg airplane (including ammunition) going 52.40 m/s fires a 5.120 kg shell forward at 890.0 m/s. What is the velocity of the plane afterward? 50.65 m/s