The force of friction always acts against the motion
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Friction always acts to oppose any relative motion between surfaces. For the simple example of a book resting on a flat table, the frictional force is zero. There is no force trying to move the book across the table, so there is no need for a frictional force because there is nothing for the frictional force to oppose
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. The force of friction always acts against the motion. ... When the object is at rest, this means that, not in motion; the friction working on it is called static friction. When the object starts moving, the friction opposing its motion is called kinetic friction.
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