In a frictional scenario, which method would increase the friction between two surfaces?

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Multiple Choice

In a frictional scenario, which method would increase the friction between two surfaces?

Explanation:
Friction in dry contact is proportional to the force pressing the surfaces together. The friction force equals μN, so increasing the normal force raises friction because more contact pressure means more microscopic resistance to sliding. Lubricants lower friction by reducing the coefficient of friction, so they don’t increase it. Speed typically has little effect on kinetic friction in the basic model, and reducing roughness often decreases friction by reducing interlocking of surface asperities. So, increasing the normal force is the way to increase the friction between the surfaces.

Friction in dry contact is proportional to the force pressing the surfaces together. The friction force equals μN, so increasing the normal force raises friction because more contact pressure means more microscopic resistance to sliding. Lubricants lower friction by reducing the coefficient of friction, so they don’t increase it. Speed typically has little effect on kinetic friction in the basic model, and reducing roughness often decreases friction by reducing interlocking of surface asperities. So, increasing the normal force is the way to increase the friction between the surfaces.

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