7
QuizMultiple Choice

Structuring an Effective Argument

Question 7 • Mad 2017 Phy Sci B -33 SS

An object is moving across a surface, but it does not gain or lose speed. Which best describes the object’s force?

Answer
A
The net force is positive.
B
The net force is zero.
C
The positive force is greater than the negative force.
D
The negative force is greater than the positive force.

Explanation

The object’s speed is not changing, so it has no acceleration. By Newton’s second law, zero acceleration means the net force is zero. Therefore, “The net force is zero” is the best description.

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