Question

friction is applied when two surfaces in contact move relatively to each other.​

Answer 1

Answer:

Explanation:

friction is simply nothing but the interlocking of the molecules of the surfaces with each other.If two bodies move in contact relative to eachother then there will be no friction since there is no disturbance in the interlocking of the molecules.And most of the factories which needs smooth surfaces polish the surfaces to reduce the interlocking and make the surface smooth.

But in the world there no frictionless surface yet invented.

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