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Introductory Physics Homework Help
Is friction really always related to the normal force?
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[QUOTE="etotheipi, post: 6408680"] Careful now! In the static case, the magnitude of the friction force is related to the magnitude of the normal force by the [I]inequality [/I]##F_s \leq \mu_s N##. Up to this threshold, the static friction force will just be whatever it needs to be to provide static equilibrium (zero net force). Only if the friction is limiting, i.e. the body is on the point of moving, will ##F_s = \mu_s N##. On the other hand, dynamic friction is defined by ##F = \mu_d N##. The origins of these equations are probably empirical, however theoretical justification (or at least models) can probably be found within a tribology textbook. [/QUOTE]
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Is friction really always related to the normal force?
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