The property of the surface in contact that give rise to fricition
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Answer: Friction is due to irregularities on the surfaces of the objects in contact. Friction depends on the smoothness of the surfaces in contact. The force of friction depends on the nature of the surfaces in contact. The force of friction increases if the surfaces are pressed harder.
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Answer:At macroscopic level it is irregularities of contact surface which oppose the motion of particle. But at microscopic level ( sub-atomic level) it is electromagnetic force which is ultimate cause of friction .
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