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On Oct 3, 2006, at 12:21 PM, John Clement wrote:
No, viewpoint number 2 is not valid. If gravitational potentialSNIP
energy can not be in the ball because the presence of the
Earth is necessary for there to be GPE. Now it is certainly
associated with objects (note the plural),
but then you have #3.
I agree with eliminating #2, even for kinetic energy (below).
Now with kinetic energy, the energy is in the object. With thermalSNIP
energy, the energy is in various physical places such as the two
objects that are rubbing against each other...
I disagree with your first sentence. KE is not in the object but
also depends on other objects; velocity is measured relative to a
system. A thrown baseball on a moving train has a different KE in
the frame of the train than it does according to an external
stationary observer. Even KE requires a system.