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This tag is for the classical concept of forces, i.e. the quantities causing an acceleration of a body. It expands to the strong/electroweak force only insofar as they act comparable to ‘classical’ forces. Use the [particle-physics] tag for decay channels due to forces and [newtonian-mechanics] or one of the other subtopics of [classical-mechanics] for the dynamics of classical systems.

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What is the derivative of potential energy with respect to $x$? [duplicate]

I was reading an article which was proving the conservation of energy with calculus, but they did not explain why the derivative of potential energy with respect to $x$ is the negative force. $${dU\ov …
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