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Title: Force, Motion
Original Title: Force motrice
Volume and Page: Vol. 7 (1757), p. 120
Author: Jean Le Rond d'Alembert
Translator: John S.D. Glaus [The Euler Society, restinn@roadrunner.com]
Original Version (ARTFL): Link
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URL: http://hdl.handle.net/2027/spo.did2222.0000.759
Citation (MLA): d'Alembert, Jean Le Rond. "Force, Motion." The Encyclopedia of Diderot & d'Alembert Collaborative Translation Project. Translated by John S.D. Glaus. Ann Arbor: Michigan Publishing, University of Michigan Library, 2007. Web. [fill in today's date in the form 18 Apr. 2009 and remove square brackets]. <http://hdl.handle.net/2027/spo.did2222.0000.759>. Trans. of "Force motrice," Encyclopédie ou Dictionnaire raisonné des sciences, des arts et des métiers, vol. 7. Paris, 1757.
Citation (Chicago): d'Alembert, Jean Le Rond. "Force, Motion." The Encyclopedia of Diderot & d'Alembert Collaborative Translation Project. Translated by John S.D. Glaus. Ann Arbor: Michigan Publishing, University of Michigan Library, 2007. http://hdl.handle.net/2027/spo.did2222.0000.759 (accessed [fill in today's date in the form April 18, 2009 and remove square brackets]). Originally published as "Force motrice," Encyclopédie ou Dictionnaire raisonné des sciences, des arts et des métiers, 7:120 (Paris, 1757).

Force of motion is the reason why a body moves. After all that we have said in the article on the notion of the word force , it is evident that the motor force cannot be defined except through its effect, that is to say by the motion that it produces.