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coefficient of friction
A number characterizing the force necessary to slide or roll one material along the surface of another. If Fs = the frictional resistance when a body is on the point of sliding along a specified surface, Fk = the frictional resistance when steady sliding has been attained, and R = the perpendicular force between the surfaces in contact, the static coefficient of friction = Fs/R; the kinetic friction = Fk/R.
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