FRICTION For Newtonian Mechanics, static friction is a real non-conservative contact force between two rough surfaces that are at rest with respect to each other. Static friction reacts equally and opposite to the net external tangential force which is attempting to cause relative motion between the two surfaces. Three conditions are required to produce a static friction force: there must be contact between the two stationary surfaces, Σ f n > 0; the surface contact must be rough, s μ > 0; and there must be a net tangential force attempting to produce motion between the surfaces, Σ f g tan > 0. The magnitude of the static friction force will range from zero up to f s (max). F s (max) = s f n where f n is the net normal force between the surfaces and s is the coefficient of static friction. The direction of f s will be opposite the direction of the net tangential force and its magnitude will equal the magnitude of the net tangential force. For Newtonian Mechanics, kinetic friction is a real non-conservative contact force
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This note was uploaded on 04/29/2010 for the course PHYSICS 195 taught by Professor Goldstein during the Spring '10 term at Mesa CC.