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Always a disadvantage

Always an advantage

Sometimes a disadvantage and sometimes an advantage.

None of the above

answer is C.

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Detailed Solution

Friction is sometimes a disadvantage and sometimes an advantage.
Friction force:It is a contact force because it is produced due to the rubbing of two different surfaces. Types of friction are –rolling friction, sliding friction, and static friction.
Friction is sometimes an advantage and sometimes a disadvantage.
Advantages of friction
●       Friction helps us to walk on earth
●       Friction helps us to write on paper.
Disadvantages of friction
●       Friction causes heat production, leading to wastage of energy and wearing and tearing of the object.
●       Friction causes noise production in machines, is irritating and leads to energy loss.
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