Question

Friction is the force that

Answer 1

Friction is a force that opposes the relative lateral motion of two solid surfaces in contact. Dry friction is subdivided into static friction ("stiction") between non-moving surfaces, and kinetic friction between moving surfaces.

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It may also be a force that opposes motion?

Answer 2

"Dry friction is a force that opposes the relative lateral motion of two solid surfaces in contact."

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