The vis inertiae is a passive Principle by which Bodies persist in their Motion or Rest, receive Motion in proportion to the Force impressing it, and resist as much as they are resisted. By this Principle alone there never could have been any Motion in...
Opticks:: Or, A Treatise of the Reflections, Refractions, Inflections and ... - Page 367
by Sir Isaac Newton - 1730 - 382 pages
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