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Using a horizontal force 200N, we inten...

Using a horizontal force ` 200N`, we intend to move a wooden cabinet across a floor at constant velocity. What is the frictional force that will be exerted on the cabinet?

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The cabinet will move with constant velocity, if net external force acting on it is zero. Since a horizontal force of 200N acts on the cabinet in the forward direction, therefore, net external force acting on it will be zero if frictional force of 200N acts on it. Thus frictional force =200N will be exerted on the cabinet.
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