Chapter 6: Momentum – Make sure to include units and show ...



Chapter 6: Momentum – Make sure to include units and show all work.

1. A baseball has a mass of [pic]kg. It is thrown by a major league pitcher at a speed of [pic] m/s (100 mph). What is the momentum of the baseball?

2. The ball from problem one lands in the catcher’s mitt and stops in [pic]seconds. What is the average force of the ball hitting the mitt?

3. A ball of clay with a mass of [pic]kg is thrown at a velocity of [pic]m/s and hits a second ball of clay and they stick together. The second ball of clay was at rest and has a mass of [pic]kg. What is the new velocity of the clay?

4. An [pic]kg car is traveling east at a rate of [pic]m/s (45 mph) and hits the back of a second [pic]kg car also traveling east but at [pic]m/s. After the collision, the first car is moving east at [pic]m/s. How fast is the second car now moving?

5. An [pic]kg Mercedes is traveling east at a rate of [pic]m/s and has a head on collision with a parked [pic]kg Mini Cooper. After the collision, the Mini is traveling [pic]m/s. How fast is the Mercedes moving after the collision?

6. Another [pic]kg Mercedes is traveling east at [pic]m/s and hits another [pic]kg Mini Cooper that is traveling west at [pic]m/s. After the collision, the Mercedes is moving east at [pic]m/s. How fast and in what direction is the Mini Cooper moving after the collision?

7. A .45 caliber bullet moves at a speed of [pic]m/s and has a mass of [pic]kg. When the bullet is fired into a [pic]kg block of wood, how fast is the block moving just after it has been shot?

8. Suppose the same .45 caliber bullet is fired at a [pic]kg man wearing a bullet-proof vest. The vest stops the bullet over a distance of [pic]meters (about 3 inches). How much time does it take for the bullet to stop?

What is the average force from the bullet hitting the vest?

9. The shot from a shotgun shell has the mass of [pic]kg and travels at a speed of [pic]m/s. If this shell is fired into a [pic]kg block of wood, how fast is the block moving just after it has been shot?

10. In the movie “Lethal Weapon,” Mel Gibson is shot with a shotgun by Gary Busey. Assume Mel has a mass of [pic]kg and the vest he is wearing stops the shot within [pic]meters. How much time does it take for the shotgun blast to stop?

What is the average force Mel feels from the blast to his vest?

11. In the movie, Mel is standing out in front of a store when he is shot. What will be Mel’s velocity immediately after being shot?

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