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

contact:roughness

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fluids:volume

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air:density

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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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(a) Given examples to show that firction depends on the nature of two surfaces in contact.
(b) Give an example to show that friction depends on the force with which the two surfaces are pressed together.

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

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

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

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.