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> 5. Point out that PE involves an interaction between two objects:
ball and earth for gravity, or two masses for a diatomic spring. But
the PE doesn't belong to either. It belongs to the system of two
objects (plus their field, if you have introduced that concept
already in class).
1) You are correct. But most textbooks say that an elevated
object "has a potential energy =m*g*h." Can this be
tolerated in the very first encounter with PE?