2004
Set 9: Impulse and Momentum
MC pg 118-120 #1, 4, 8-12, 15-17, 19, 20
4. Figure MC4 shows a ball rolling down a curved incline. Which diagram depicts the resulting motion correctly? (a), (b), (c), (d), or (e) none of these.
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8. A 1.0-kg body at rest experiences a force of 5.0 N exerted in the positive x-direction for 2.0 s, followed by a force of 10 N exerted in the negative x-direction for 1.0 s. Its resulting speed will be (a) + 10 m/s (b) -10 m/s (c) +20 m/s (d) - 20 m/s (e) none of these.
9. Refer to the force-time curve for an object of constant mass m in Fig. MC9. When was the object at rest? (a) 0 s to 1s (b) 4s to 5s (c) 2s to 3s (d) 3s to 4s (e) not enough information given.
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10. When did the object in Fig. MC9 have a constant velocity? (a) 3s to 4s (b) 2s to 3s (c) 4s to 5s (d) 5s to 6s (e) not enough information given.
11. Which interval in Fig. MC9 corresponds to the greatest change in the speed of the body? (a) 0s to 1s (b) 1s to 2s (c) 2s to 3s (d) 3s t o4s (e) 5s to 6s.
12. During which time interval in Fig. MC9 did the body decelerate? (a) 0s to 1s (b) 2s to 3 s (c) 3s to 4s (d) 5s to 6s (e) none of these.
15. A garbage truck crashes head-on into a Volkswagen and the two come to rest in a cloud of flies. Which experiences the greater impact force? (a) the truck (b) the Volkswagen (c) both experience the same force (d) not enough information given (e) none of these.
16. Two equal-mass bullets traveling with the same speed strike a target. One of the bullets is rubber and bounces off: the other is metal and penetrates, coming to rest in the target. Which exerts the greater impulse on the target? (a) the rubber bullet (b) the metal bullet (c) both exert the same (d) not enough information (e) none of these.
17. An open railroad car filled with coal is coasting frictionlessly. A girl on board starts throwing the coal horizontally backward straight off the car, one chunk at a time. The car (a) speeds up (b) slows down (c) first speeds up and then slows down (d) travels at constant speed (e) none of the above.
19. A bomb hanging from a string explodes into pieces of different sizes and shapes. After the explosion (a) the vector momentum of each piece is identical (b) the total momentum is increased (c) the momentum of all the pieces, exhaust, and smoke adds up to zero (d) not enough information to comment (e) none of the above.
20. A can of whipped cream floating in space develops a hole in the bottom from which it squirts backward a mess of gas and cream at a constant speed with respect to the can. The can thereupon (a) accelerates forward throughout the squirting (b) moves forward at a constant speed (c) remains at rest (d) first speeds up, and then slows down when the gas runs out (e) none of the above.
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