1AcQuiz4

# 1AcQuiz4 - Physics 1A (c) Fall 2006: Quiz 4 Version D 1...

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Physics 1A (c) Fall 2006: Quiz 4 Version D 1 10.29.06 Closed book. No work needs to be shown for multiple-choice questions. 1 . Alex throws a 0.15-kg rubber ball down onto the floor. The ball’s speed just before impact is 6.5 m/s, and just after is 3.5 m/s. If the ball is in contact with the floor for 0.025 s, what is the magnitude of the average force applied by the floor on the ball? a. 3.0 N b. 3.5 N c. 133 N d. 60 N 2 . A 7.0-kg bowling ball strikes a 2.0-kg pin. The pin flies forward with a velocity of 6.0 m/s; the ball continues forward at 4.0 m/s. What was the original velocity of the ball? a. 5.7 m/s b. 6.6 m/s c. 3.3 m/s d. 4.0 m/s 3 . A valid unit for momentum is which of the following? a. kg m 2 b. kg m/s c. kg m/s 2 d. N m 4 . A billiard ball collides in an elastic head-on collision with a second identical ball. What is the kinetic energy of the system after the collision compared to that before collision? a. the same as b. one fourth c. half d. twice 5 . Mitch throws a 100-g lump of clay at a 500-g target, which is at rest on a horizontal surface.

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## 1AcQuiz4 - Physics 1A (c) Fall 2006: Quiz 4 Version D 1...

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