Assertion :Friction is a force which acts in the direction of motion of a body. Reason: Polishing a surface reduces friction of the surface.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is D Both Assertion and Reason are incorrect
Friction is a resisting force that acts on a body to prevent or retard its motion. Friction force always acts tangent to the surface at points of contact. Friction force acts opposite to the direction of motion.

Friction on a surface is caused due to the irregularities on that surface. By polishing a surface, these irregularities get evened out and the friction of that surface decreases. But if we polish that surface beyond a certain limit then the friction of the surface increases.

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