Friction can be increased by increasing:

Smoothness of the surface

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Grease on the surface

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Roughness of the surface

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Lubricating the surface

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Solution

The correct option is C Roughness of the surface
Rough surface is uneven so it provides more resisitance to motion of a body hence the frictional force increases.

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Similar questions

A cube is pushed in such a way that it is sliding on a horizontal surface. Frictional force acting on the cube can be increased by:

Increased smoothness increases friction

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