SAT Subject Physics Practice Question 395: Answer and Explanation

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Question: 395

1. When a woman pushes on her grocery cart, the woman moves because of

A. the force the woman exerts on the grocery cart.
B. the force the grocery cart exerts on the woman.
C. the force the woman exerts on the ground.
D. the force the ground exerts on the woman.
E. the force the grocery cart exerts on the ground.

Correct Answer: D

Explanation:

The correct answer is (D). The woman pushing on the ground is one part of a force pair. The second part of the pair is the ground pushing on the woman. The force the woman exerts cannot move the ground, but the force the ground exerts does move the woman.

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