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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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may increase or decrease

increase

remain the same

decrease

answer is B.

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Detailed Solution

Question Image
From the vector diagram , N = Rcosθ and f = R sinθ

Where R = Contact force

f = frictional force

N = Normal Reaction.

If θ decreases , sin θ decreases and f decreases.

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