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Question

Which of the following term is wrong about kinetic friction?

A
It is a contact force.
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B
It is an electro-magnetic force.
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C
It decreases speed of the object.
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D
It opposes relative velocity.
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Solution

The correct option is C It decreases speed of the object.

Here V1>V2 and upper block is slowly placed on the lower block.

For upper block, friction opposes velocity & for lower block, friction supports velocity, so that both the blocks will not move relative to each other. So, sometimes kinetic friction decreases speed of object in contact and sometimes increases its speed.

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