What happens to interlocking between two surfaces in contact when a lubricant is applied between them?

Interlocking remains unchanged.

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Interlocking increases.

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Interlocking decreases.

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Interlocking no longer exists.

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Solution

The correct option is C Interlocking decreases.
Friction is caused due to interlocking of irregularities present on the surfaces in contact. When a lubricant is applied, it forms a layer between the two surfaces. This helps in reducing interlocking and hence friction. However, friction can not be totally eliminated.

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