Two surfaces are rubbed together, first with a small force and then with a greater force. In which case will the friction between the surfaces be higher? Give reasons.

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Solution

Friction force opposes the relative motion between two surfaces in contact. If two surfaces are rubbed with a small force then simply the opposing force would also be small, but if they are rubbed with a stronger force then friction force will try to oppose the force involved. Hence, it would be higher.

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