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Now, John, the idea of "internal work" is absolutely out of the
question in my development of thermophysics. Work is the transfer of
energy (unaccompanied by entropy) through a control surface. ...
I have no problem with internal potential energy. At least I don't
think I do. I suppose a system composed of M kgs of metal sliding
horizontally upon a large metal slab with initial velocity V, relative to
the lab coordinates, should have 0.5MV^2 added to its "regular"
(ordinary?) internal energy, U. Eh? Likewise if the system is a
compressed spring that can be released by wishing it to be released ...
? Or a mass of M kgs 100 meters above the lab floor ... ?