



Unit 4, Quiz #1
1. A freight train rolls along a track with considerable momentum. If it rolls at the same speed but has twice as much mass, its momentum is ________________.
2. Impulses are smaller when bounces take place.
3. A karate expert executes a swift blow and severs a cement block with her or his bare hand. The
4. A rocket cannot accelerate in outer space because ...
5. In order to catch a ball, a baseball player moves his or her hand backward in the direction of the ball's motion. Doing this reduces the force of impact on the players hand principally because ...
6. Paul D. Trigger fires a bullet. The speed of the bullet will be the same as the speed of the recoiling gun ______________.
8. You're driving down the highway and a bug spatters into your windshield. Which undergoes the greater change is momentum?
9. What impulse will give a 2.0 kg mass a momentum change of +50 kg m/sec?
10. A body of mass 5.0 kg is moving on a smooth surface with a velocity of 6.0 m/s to the right. A constant force is applied for 3.0 s, giving the body a final velocity of 12 m/s to the left. The applied force was
11. A 2 kg ball hits a surface perpendicularly with a speed of 5 m/sec and bounces back with a speed of 2.5 m/sec. Determine the momentum change of the ball. PSYW
12. A 2 N force acts on a 10kg mass. If the momentum of the mass changes by 120 kg m/sec. Determine the time over which this force acts. PSYW
13. A 1000kg car have traveling with a velocity of 35 m/s collides with a 4000kg truck traveling with a velocity of +10 m/s collides. Both the truck and the car are traveling in the same direction. The truck and car entangle and move together with the same velocity after the collision. Use the law of conservation of momentum to determine the velocity of the truck and car immediately after the collision. PSYW
14. Jocko the clown, who
has a mass of 60.0 kg and stands at rest on the
ice, catches a 15.0kg ball that is thrown to him
at 20.0 km/hr. Jocko catches the ball and slides
across the ice after the "collision". How fast does
Jocko (and the ball) move across the ice after the
collision? Organize your work (a momentum table is
a great idea) and show a clear solution to the
problem Accompany your answer by appropriate units.

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Last updated on 12/14/98.