SAT Subject Physics Practice Question 668: Answer and Explanation

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Question: 668

4. A force of 53N is applied to a 176.4N object that is at rest. A frictional force of 8N must be overcome to move the object. What is the acceleration of the object?

A. .3 m/s2
B. 2.5 m/s2
C. 2.9 m/s2
D. 4.24 m/s2
E. 6.625 m/s2

Correct Answer: B


The correct answer is (B). Use F=ma to solve the problem. Don't forget to subtract the frictional force from the applied force. Also don't forget to convert the weight of the object into mass. Set the problem up in this manner:

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