SAT Subject Physics Practice Question 392: Answer and Explanation

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Question: 392

13. A wooden crate is pushed across a concrete floor at 5 m/s and released. It slides to a stop after moving a short distance. The same crate is filled until it weighs twice as much as it did previously and again slid across the floor at 5 m/s and released. The stopping distance for the crate will be

A. 1/4 as far.
B. 1/2 as far.
C. the same distance.
D. twice as far.
E. four times as far.

Correct Answer: C


The correct answer is (C). The coefficient of friction remains the same so the frictional force doubles, but the net force also doubles. Thus the crate is brought to a stop in the same distance.

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