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I answered the question for myself by using google (etymonline.com).
From the similarity in the roots and the words themselves, I think the
idea of flow should be eschewed by instructors of beginners, except for
(with) real (as opposed to imaginary) fluids, e.g. water, gasses, ions,
etc.
p.s. momentum is transferred from one object to another by work (+ & -)
during a collision?