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Friction is a force between two surfaces that oppose each others motion. The most common example is that of sliding friction, when you rub the surfaces of your hands together. The heat you feel being generated is a result of the friction (in this case, drag) being created by the ridges and divots in the skin molecules as they attempt to slide past each other. Essentially, the rougher the surface, the higher the coefficient of friction. Friction was first mentioned by Leonardo da Vinci (1452-1519) in his notebooks, but was left unpublished. The work was rediscovered by Guillame Amontons in 1699, and further developed by Charles Augustus de Coulomb in 1785. Sliding friction is the most common, but their is also fluid friction, between fluids like air and water, and rolling friction, between a wheel surface and the surface it is rolling on. In all cases, friction is a force generated as a result of molecules in the two substances contacting and opposing each others motion.
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