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I was trying to bring up the fact that
dP/dt = m dv/dt + v dm/dt; with which Newton was intimately aware and
which is often overlooked in our more modern treatments of F= ma in
beginning dynamics. We tend to leap at F = m dv/dt right away, which is
incomplete. Newton's language was very cagey about this; better
than most of our own textbooks. However, a distinct idea of P evolved
BEFORE F by some considerable time. No co-evolution here, one distinctly
precedes the other.