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These discussions of terminology seem to keep coming up - "period", "simpleBecause by it's very NATURE, all science is tentative and incomplete.
harmonic motion" "weightless" "heat".... I don't usually get involved, but
I DO think that terminology is important. Not that I expect a student to
be able to spout back the exact definition of every word or law in the
book, but that such definitions are available should clarification be
sought. A lawyer can find the exact definition of "grand theft auto", a
pharmacist doesn't have to debate what "codeine 100 mg t.i.d" means. Why
should physicists keep arguing the same point over and over? When we
discussed "weightless" some time ago, it wasn't that the various sides
didn't understand each other, but rather that each side thought it had a
better definition. Why not slug it out, pick a winner, and then accept the
results? Unless new evidence or insights have been gained to necessitate a
new definition, accept the consensus and move on!