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Rather than defining a new term, you just use delta p. That makes
sense.
From that point of view, the relationship between impulse andmomentum is not even a "theorem" -- the only new thing here
We teach F = ma but we don’t seem to carry that forward to talk about
the change in velocity
My children had a 4th grade textbook with the following review question:
It takes a lot of ____ to stop an airplane.
The only reasonable choice was Force.
The correct answer is Impulse.