SAT Subject Physics Practice Question 650: Answer and Explanation

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Question: 650

1. Two objects have the same mass and are located near each other at a distance (r). If the mass of one of the objects is doubled and the mass of the other object is tripled, what would be the change in gravitational attraction between them?

A. Decrease by 1/6
B. Decrease by 2/3
C. Increase by 3/2
D. Increase by 5
E. Increase by 6

Correct Answer: E


The correct answer is (E). The radius between the two masses does not change. That means in the gravitational equation the only thing that changes is the mass of the two bodies. Multiply them together to find the magnitude of the change in force they exert on each other.

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