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When a baseball is thrown, it is
difficult for me to think of something like a fluid corresponding to the
baseball's energy flowing.
That's a good point. That situation doesn't really correspond
to a flow of energy from region A to region B ... the energy is
just transformed in place, transformed from KE to PE and back
again. Since there's no spatial separation, flow images don't
really apply ... and I'm not sure what images should apply.
Maybe red fluid turning into blue fluid and back again?? I like
Bob's suggestion of pennies flipping heads <--> tails ... I
wonder if we could somehow refine it to give some control of
the PE/KE ratio.