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the force of friction is described by the force of friction is described by the law of friction. the theory of friction. a model of friction. the friction hypothesis.

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Answer: coefficient of friction, ratio of the frictional force resisting the motion of two surfaces in contact to the normal force pressing the two surfaces together. It is usually symbolized by the Greek letter mu (μ). Mathematically, μ = F/N, where F is the frictional force and N is the normal force.

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