What is a fricion and what are the factor affecting friction
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The nature of the surface (smoothness or roughness) affects the friction. Smooth surfaces have lesser irregularities. The lesser the irregularities, the lesser the tendency to lock. The lesser the tendency to lock with another object, the lesser the friction (that is tendency to oppose motion).
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Friction is the opposing force acting on a moving body.
Friction is reduced by streamlining , greasing , etc
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