Question

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How does the friction get affected by the nature of surface???

Answer 1

Friction increases with increase in roughness of surface and decreases with decrease in roughness. It is because rough surface creates much stronger interlocking than smooth surface.
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Answer 2

The force due to friction is generally independent of the contact area between the two surfaces. This means that even if you have two heavy objects of the same mass, where one is half as long and twice as high as the other one, they still experience the same frictional force when you drag them over the ground.

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