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Factors Affecting Friction

Frictional fo...

Question

Frictional forces between two surfaces come into play only when the two surfaces:

A

are not in contact with each other.

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B

are close to each other

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C

are in contact with each other.

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D

are far away form each other

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Solution

The correct option is C are in contact with each other.
Frictional force acts only when two surfaces are in contact with each other. It is a contact force which opposes the relative motion of an object.

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Q. Question 1
Whenever the surfaces in contact tend to move or move with respect to each other, the force of friction comes into play

(a) only if the objects are solid.
(b) only if one of the two objects is liquid.
(c) only if one of the two objects is gaseous.
(d) irrespective of whether the objects are solid, liquid or gaseous.

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