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If the net force on a particle at some point in space is zero, must its potential energy also be zero at that point? Explain.

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Answer: NO

Explanation: We know from Newton's First Law of motion -- the Law of Inertia -- that if the net force on an object is zero, the acceleration of that object will also be zero. An object at rest has zero acceleration. An object that continues to move in a straight line with constant velocity has zero acceleration.

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