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If a block moves due to some force on a rough surface with velocity "u" and after lubrication, on applying the same force, it moves with velocity "v", then _______________________.
Choose the correct option to complete the sentence.

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$v = u$

$v < u$

$v > u$

$v \geq u$

answer is C.

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Detailed Solution

Friction is caused due to the interlocking of the irregularities of the surfaces of the objects.

When a lubricant is applied on the surface, a thin layer of lubricant gets deposited in the irregularities that avoid direct contact with the surfaces.

Therefore, lubrication causes overall friction to decrease. Hence velocity increases.

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