Engineering Mechanics Practice Exam

Assume that an object has no unbalanced force acting on it. Which statement about the object is true?

the object may be in motion the object must be slowing down the object must be at rest the object may be speeding up

Correct Answer:

the object may be in motion

Explanation:

The key idea is inertia: when no unbalanced force acts, the net force is zero and acceleration is zero. With zero acceleration, the velocity stays constant. So the object can remain at rest or continue moving in a straight line at constant speed. That’s why it may be in motion. It cannot be slowing down or speeding up, since that would require a nonzero acceleration, and it is not required to be at rest because uniform motion is also possible.

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