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Question

Suppose you exert 200 N on your refrigerator and push it across the kitchen floor at constant velocity. What friction force acts between the refrigerator and the floor? Is the friction force equal and opposite to your 200-N push? Does the friction force make up the reaction force to your push?

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The acceleration of a refrigerator traveling at constant velocity is zero. If the refrigerator's acceleration is zero, the net force on it is also zero, which ensures that all of the forces pushing and pulling on it must balance out exactly. As a result, if you force on the refrigerator with a force of 200 N, there must be a 200 N friction force acting on the refrigerator, canceling your force.

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