coefficient of friction
n. pl. coefficients of friction
The ratio of the force that maintains contact between an object and a surface and the frictional force that resists the motion of the object.
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coefficientof viscosity — coefficient of viscosity n. pl. coefficients of viscosity The degree to which a fluid resists flow under an applied force, measured by the tangential friction force per unit area divided by the velocity gradient under conditions of streamline… … Universalium