SAT Subject Physics Practice Question 539: Answer and Explanation

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Question: 539


A 50 kg object slides to a stop over a period of time. Which of the graphs represents each of the described factors?

The frictional force on the object

A. A
B. B
C. C
D. D
E. E

Correct Answer: D


The correct answer is (D). As long as the object is moving, the frictional force is a constant force that opposes motion. This is shown in graph D.

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