Another macroscopic consequence of microscopic reversibility is the symmetry of kinetic coefficients, the so-called reciprocal relations.
2.
Both static and kinetic coefficients of friction depend on the pair of surfaces in contact; for a given pair of surfaces, the coefficient of static friction is " usually " larger than that of kinetic friction; in some sets the two coefficients are equal, such as teflon-on-teflon.
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