When two perfectly smooth surfaces slide over each other, the primary cause of friction is .

interlocking

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roughness

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adhesion

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Solution

The correct option is C adhesion
The sliding of the perfectly smooth surfaces is opposed by the molecular adhesion between the surfaces in contact.

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When two perfectly smooth surfaces slide over each other, the primary cause of friction is .

The correct option is C adhesionThe sliding of the perfectly smooth surfaces is opposed by the molecular adhesion between the surfaces in contact.

The correct option is C adhesion
The sliding of the perfectly smooth surfaces is opposed by the molecular adhesion between the surfaces in contact.