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Which among the following is NOT true?

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Friction can be entirely eliminated.

Friction is desirable in some situations.

No surface is perfectly smooth.

Lubricants reduce friction.

answer is C.

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Detailed Solution

Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other.

The statement "friction can be entirely eliminated" is not true.

Friction can never be entirely eliminated. No surface is perfectly smooth. Some irregularities are always there.

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