Cambridge UK: Cambridge University Press | I Bernard Cohen Peter M |
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Celestial Mechanics and Dynamical Astronomy | 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 |
Hannah, J, Hillier, M J, Applied Mechanics, p221, Pitman Paperbacks, 1971• I]t is essential to deal with the same set of particles throughout the time interval[.
1] Consequently, the mass of the system can not change during the time of interest | Metaphysics Research Lab, Stanford University |
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Any single force is only one aspect of a mutual interaction between two bodies | "On the use and abuse of Newton's second law for variable mass problems" |