relation to one another.

The second law quantifies the action of a force. Newton was the first person to draw a clear distinction between the concepts of weight and mass. His thoughts on gravity had told him that the weight of abody varies with its position, but there had to be some related property that was intrinsic to the body, that he called the 'quantity of matter' and which arose from a combination of a body's density and its volume. Of course, this begs the question 'What is density?', which Newton did not attempt to answer. The quantity of motion is the product of the mass with the velocity, and is a vector - the momentum. Newton formulated the second law in terms of impulsive forces, but applied it to the case of continually acting forces (which he thought of as the limit of a sequence of impulses) in

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