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Thanks John.
I want to be sold on the momentum flow method so I am
trying to see what the advantage of it is. The short version of the
force method would be, "add the mass of a table-tennis ball to the
left (the internal forces don't matter) and push down hard on the
right--the right goes down." I got the impression that a short movie
with little down arrows flowing into and out of the beakers flashed
into your mind and you immediately saw the little down arrows flowing
into the beaker on the right faster. I wanted to see that movie.