| "On the use and abuse of Newton's second law for variable mass problems" | 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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| Cambridge UK: Cambridge University Press | Any single force is only one aspect of a mutual interaction between two bodies |
| Cambridge UK: Cambridge University Press | 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 |
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| I]t is essential to deal with the same set of particles throughout the time interval[ | Celestial Mechanics and Dynamical Astronomy |