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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 can't the work done by a non-conservative force be zero?

As non conservative forces are those forces whose work done depend upon path followed by a particle. So around a closed path it's value will be positive because some path have been followed by partic …
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