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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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Which force do I use for work done by an engine
$F_{loc}$. You were inattentive reading that paragraph from Wikipedia. It correctly states that work is done on the body by the resultant force on that body. In your case, if the locomotive is not acc …