Question

Factors which increase and decrease friction

Answer 1

A Rough and Uneven Surface  causes more friction.

Friction is decreased when  the surface is either smooth, lubricated , or both.

A smooth surface offers less friction without lubrication.
but, a rough surface, when lubricated, also allows less friction

Answer 2

Answer:

Friction depends partly on the smoothness of the contacting surfaces, a greater force being needed to move two surfaces past one another if they are rough than if they are smooth.

Explanation:

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