Question

what is friction?write the S.I unit of speed
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Answer 1

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Friction:

It is force that resists the sliding or rolling of one solid object over another.

S.I unit of speed --- m/s

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Answer 2

Explanation:

Friction is the resistance to motion of one object moving relative to another. It is not a fundamental force, like gravity or electromagnetism. Instead, scientists believe it is the result of the electromagnetic attraction between charged particles in two touching surfaces.

Speed has the dimensions of distance divided by time. The SI unit of speed is the metre per second, but the most common unit of speed in everyday usage is the kilometre per hour

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