How does friction depend on the nature of the surface?
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Friction depends on the nature of surfaces in contact. For a given pair of surfaces, friction depends upon the state of smoothness of those surfaces. The force of friction is greater if a rough surface is involved. Friction is caused by the irregularities on the two surfaces in contact.
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Friction force depends on the nature of the surface in contact. If the surface area is rough then the frictional co-efficient of the surface will also be larger thus will need more force to slide increasing friction.
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