"Solicitation takes place when a heavy body tries to begin its motion and has not yet received within itself any impetuosity. This happens precisely when bodies are in equilibrium and , [both] trying to fall, are mutually hindered. But when a heavy body has made some progress in its free fall, and has received some impetuosity or living force, then the heights to which this body may attain are not proportional to the speeds but to the squares of the speeds."G. W. Leibniz, Essay on Dynamics concerning the laws of motion (Mathematische Schriften, Vol. 6, pp. 215-231). Circa 1691. Translation from the French, Chester Burke, 1992. |
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