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Q.

A horizontal force of $200 N$ 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

200 N

applied to a wooden block. The block moves with constant velocity. Then the frictional force is

- 200 N

Frictional force: Question Image

Question Image

Friction 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

.

F_{net} = 200 N + F_{Friction}

F_{net} = 0

(since object is moving with constant velocity or with zero acceleration)

\Rightarrow 0 = 200 N + F_{Friction}

\Rightarrow F_{Friction} = - 200 N

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