Forces of friction

Force of friction

A force of friction is the force by which a surface resists any motion or impending motion across it.

(By impending motion we mean that there is no actual motion, but the object is under the effect of a force which would cause it to move if it were not resisted by the surface.)

The friction force on an object acts in a direction opposite to that of its motion or impending motion relative to the surface.

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