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Question

Friction between any two objects is due to

A
Attraction between them
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B
Repulsion between them
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C
Some adhesive forces between them
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D
Irregularities on the surfaces
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Solution

The correct option is D Irregularities on the surfaces
Friction between two surfaces is primarily due to the irregularities on the surface. The hills and valleys of one surface interlock with the same of the other surface, this creates restrictive force between two surfaces which restricts relative motion.
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