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Newtonian mechanics discusses the movement of classical bodies under the influence of forces by applying Newton’s three laws. For more general concepts, use [classical-mechanics]. For Newton’s description of gravity, use [newtonian-gravity].
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Direction of friction of a rotating ring/disk
Each infinitesimal element of your friction area will contribute to friction, which is summed up to zero. However, the friction in each element will also contribute to torque whose direction is oppose …