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friction
A resisting force between two surfaces that are sliding against each other. Static friction is the frictional force that opposes any attempt to start a body moving that is a rest. Kinetic friction is the frictional force that tends to slow a body already in motion. The force due to kinetic friction is generally proportional to the applied force, so a coefficient of kinetic fiction is defined as the ratio of frictional force to the normal force on the body. In general, static friction is greater than kinetic friction. See also coefficient of friction.
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