| http://www.w3.org/ns/prov#value | - did you know? newton???s principia mathematica did not include ???F = ma???. instead, his formulation of the law is that force is the derivative of what he called ???quantity of motion???, which we now call momentum. when mass is a constant, as it is for most objects (but not, say, rockets, which continuously eject matter), the two formulations are equivalent, because momentum is mass times veloci
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