When two surfaces in contact are very rough, between the surfaces is the main cause of friction.

interlocking

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plowing effect

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adhesion

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Solution

The correct option is A interlocking
Interlocking is the primary cause of friction when two surfaces in contact are very rough.

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Similar questions

What causes friction between two surfaces in contact when they try to slide past each other?

Name the force which increases when the two surfaces in contact are made more rough.

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