2 min readβ’june 11, 2020

Kanya Shah

1) A ball rolls off the edge of the table. The horizontal component of the ballβs velocity remains constant during its entire trajectory because

A: the ball is not acted upon by a force in the horizontal direction.
B: the net force acting on the ball is zero.

C: the ball is not acted upon by any force.Β

D: the ball is not acted upon by any force in the vertical direction.Β

E: None of the other choices are correct.

2)

Image courtesy of AP Physics Walker Textbook.

The scale at the left is attached to the ceiling and a mass of 1.00 kg hangs from it. It reads 9.81 N. The identical scale at the right is connected by perfect springs passing over perfect pulleys to two 1.00 kg masses hanging vertically at the end of the strings. The scale at the right reads

A: exactly 19.62 N
B: more than 19.62 N

C: more than 9.81 N

D: less than 9.81 N but quite twice as much

E: exactly 9.81 N

3) A force produces power P by doing work W in a time T. What power will be produced by a force that does six times as much work in half as much time?

A: 12P
B: 6P

C: 1/12 P

D: 3/8 P

E: 1P

Approach these problems with the concepts in mind and consider whether the answer is plausible or just a ridiculous option meant to distract you. Once you narrow it down to the last two choices, go back to the problem and reread whatβs being asked. Sometimes you can make a guess based on the context if you havenβt gotten the answer. If you donβt know how to solve the problem, you should guess using any clues from the units and questions to figure the answer out.

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