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Q.

A horizontal force of 200N is applied to a wooden block. The block moves with constant velocity. Then the frictional force is [[1]] N.


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Detailed Solution

A horizontal force 200N applied to a wooden block. The block moves with constant velocity. Then the frictional force is -200 N
Frictional force:Question ImageFriction is the force that resists motion when the surface of an object comes in connection with the surface of another.
The block will move with constant velocity only when the net force on it is zero. As the velocity of the block is constant, its acceleration should be zero. This implies that the magnitude of opposing frictional force is equal to the force exerted on the block, which is 200 N. Therefore, the overall friction force is -200 N.
Fnet=200N+FFriction
Fnet= 0 (since object is moving with constant velocity or with zero acceleration)
⇒ 0=200 N +FFriction
⇒FFriction = -200 N
 
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