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

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The cabinet will move across the floor with constant velocity, if there is no net external force of 200N should be applied on the cabinet in opposite direction.
Thus, the frictional force = 200N
(Frictional force always acts in the direction opposite to direction of motion)

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