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The _only_ way to change the property of energy of a system is to do work
on that system.
It seems to me that
the clearest way to explain this process (at least to
the beginning student) is that the process of doing
work on the spring has increased its EPE and that this
energy came from whatever outside agent did the
stretching. No? John Barrere
Energy is not "transferred!" ie it does not "move" or "flow"
Just before you started the section on Thermo, you did the work/energy
principle - Why would you now abandon it???
Trying to say that some new mumbo jumbo is easier for the student to
understand than what s/he has just learned is beyond me.