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orBUT......
The important feature here is when the momentum changes. How do you know
when the momentum changes? Answer--if the object speeds up, slows down,
changes direction.
I would say, "If the velocity of the object changes."
^^^^^^^
Now if using acceleration, one asks: "How do you know if the object is
accelerating?" Answer--if the object speeds up, slows down, or changes
direction.
I would say, "If the velocity of the object is changing."
^^^^^^^^^^^
The difference may appear minor, but I believe its pedagogical effect
is not at all subtle.
--
John Mallinckrodt mailto:ajm@csupomona.edu
Cal Poly Pomona http://www.csupomona.edu/~ajm