SAT Subject Physics Practice Question 573: Answer and Explanation

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Question: 573

14. Sir Isaac Newton's third law of motion is called the action-reaction law. Which of the following statements appropriately describes the action-reaction forces?

A. They act on different objects.
B. They act on the same object.
C. They are unequal in magnitude.
D. They act at right angles to one another.
E. They act in the same direction.

Correct Answer: A


The correct answer is (A). The force pairs discussed in the third law are equal in magnitude, oppositely directed, and operate on differing bodies.

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