| "On the use and abuse of Newton's second law for variable mass problems" | Celestial Mechanics and Dynamical Astronomy |
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| ] Consequently, the mass of the system can not change during the time of interest | Cambridge UK: Cambridge University Press |
Hannah, J, Hillier, M J, Applied Mechanics, p221, Pitman Paperbacks, 1971• Any single force is only one aspect of a mutual interaction between two bodies.
12| Quoting Newton in the Principia: It is not one action by which the Sun attracts Jupiter, and another by which Jupiter attracts the Sun; but it is one action by which the Sun and Jupiter mutually endeavour to come nearer together | When the mass varies due to accretion or ablation, [an alternate equation explicitly accounting for the changing mass] should be used |
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| I Bernard Cohen Peter M | Metaphysics Research Lab, Stanford University |
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