What types of friction do you know?

Three types of friction are distinguished: sliding friction, rest friction and rolling friction. The force of rest friction prevents solids from moving, it is always equal in magnitude to the external force acting on the body, and is directed in the opposite direction. The sliding friction force is the force that arises between the contacting bodies during their relative motion. The rolling friction force is the friction force that occurs when one body rolls on the surface of another body.

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