how does the friction depend on the nature of the surface
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Friction depends on the nature of the two surfaces. It depends on smoothness or roughness of the two surfaces which are in contact of each other. ... When two surface is rough then the friction is more because the interlocking is very strong in very rough surface.
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Friction depends partly on the smoothness of the contacting surfaces, a greater force being needed to move two surfaces past one another if they are rough than if they are smooth.
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