November 14, 2017 Phys 1410 Exam 3-A Suppose a ping-pong ball and a bowling ball

Question

November 14, 2017 Phys 1410 Exam 3-A Suppose a ping-pong ball and a bowling ball are rolling toward you. Both have the same momentum and you exert the same force to stop each. 1. Which requires a longer time interval to stop? A. The bowling ball. B. The ping-pong ball. C. Both take the same amount of time. 2. Which requires a longer distance to stop? A. The bowling ball. B. The ping-pong ball. C. Both take the same distance. 3. Consider two cars, of masses m and 2m, each at rest on an air track. You push each for three seconds, exerting the same amount of force. In this situation, the final momentum of the light car is that of the heavier car. A. four times B. twice C. equal to D. one-half E. one-quarter 4. In the above situation, the work done to move the light car is that of the heavier car. A. four times B. twice C. equal to D. one-half 5. You throw two balls of equal size and mass at a bowling pin. One, made of rubber, bounces back, and one, made of putty, sticks to the pin. Which ball is most likely to topple the bowling pin? A. The rubber ball. B. The ball of putty. C. It makes no difference. 2 of 7

Explanation / Answer

1. change in angular momentum = torque x time

torqur and change in angular momentum is same so time will be same.

(C)

2. Work done = change in kE

F d = KE

F is same. but KE of ping pong is greater so distance will be greater.

Ans(B)

3. momentum = F x t

F and t are same for both.

Ans(C)

4. Work done = change in KE

KE = p^2 / 2 m

so lighter mass will have greater KE. (double)

so work done will be double.

Ans(B)

5.change in momentum is greater for rubber ball.

hence greater force .

Ans:(A)

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