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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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Why doesn't Newton's Third Law prevent work from being done?

I apply a force on an object. The object applies an equal and opposite force on me. I realize the forces are on two distinct bodies and do not cancel each other out. Accordingly, the work done by me a …
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Is tension an internal force in Atwoods machines

Well, if you want to find the acceleration of the center of mass of the whole system, then you need to consider the whole system as one body. Hence, the tension forces between the masses and the pulle …
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