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Question

Friction depends on the following two factors:
(a) Materials of the body in ___.
(b) ___ of the two surfaces.

A
contact:roughness
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B
fluids:volume
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C
air:density
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D
vacuum:mass
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Solution

The correct option is A contact:roughness
Friction depends on the roughness of the bodies in contact with each other. More rough the surface, greater is the friction.

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