SAT Subject Physics Practice Question 12: Answer and Explanation

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Question: 12

3. A frictionless inclined plane of length 20 m has a maximum vertical height of 5 m. If an object of mass 2 kg is placed on the plane, which of the following best approximates the net force it feels?

A. 5 N
B. 10 N
C. 15 N
D. 20 N
E. 30 N

Correct Answer: A

Explanation:

The net force that the object feels on the inclined plane is mg sinθ, the component of the gravitational force that is parallel to the ramp. Since sin θ = (5 m)/(20 m) = 1/4, we have Fnet = (2 kg)(10 N/kg)() = 5 N.

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