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What is the SI unit of friction? Like all forces, the unit for friction is the Newton, which is equal to 1 kg·m·s-2. In Imperial, the force unit is the pound of force, lbf, 1 of which is roughly 4.45 N. The coefficient of friction is dimensionless, and therefore has no units.Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other. There are several types of friction: Dry friction is a force that opposes the relative lateral motion of two solid surfaces in contact.
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