Using ahorizontal force of 200 N, we intend to move a wooden cabinet acrossa floor at a constant velocity. What is the friction force that willbe exerted on the cabinet?

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Solution

Aforce of 200 N is applied in the forward direction. Thus, fromNewton’s third law of motion, an equal amount of force will actin the opposite direction. This opposite force is the fictional forceexerted on the cabinet. Hence, a frictionalforce of 200 N is exerted on the cabinet.

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