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In a situation the contact force by a rough horizontal surface on a body placed on it has constant magnitude. If the angle between this force and the vertical is decreased, the frictional force between the surface and the body will

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increase

decrease

remain the same

may increase or decrease

answer is B.

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Detailed Solution

The horizontal component of the contact force will be equal to the frictional force acting on the body.

If the angle made by the contact force is decreased the component of the horizontal component will be decreased.

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