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_Friction_Forces_doc_ - For any given pair of surfaces ±...

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Friction Forces — Act || surface of contact between 2 bodies. Oppose relative sliding motion of the surfaces or the tendency for such motion to start. Dry Friction ( approximate force laws): Kinetic (Sliding) Friction force: f k = ± k N ± k = coefficient of kinetic friction N = normal contact force at the surfaces Static (Sticking) Friction force: f s ² ± s N ± s = coefficient of static friction
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Unformatted text preview: For any given pair of surfaces: ± k < ± s Rolling Resistance ("Friction") — Opposes rolling motion along a surface. — Due to slight deformation of the surface and/or the rolling object as it rolls. Rolling Resistance force: f r = ± r N ± r = coefficient of rolling resistance Usually: ± r << ± k...
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