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Consider an astronaut dropping a rock on the moon. While the rock isBefore the drop:
falling, how does the kinetic energy of the moon/rock/astronaut SYSTEM change?
How does the rest energy of the moon/rock/astronaut SYSTEM change?
System potential energy = some negative value a
System kinetic energy = zero
During the drop:
System potential energy < a
System kinetic energy > 0
After the drop:
System potential energy << a
System kinetic energy = 0
Are there other forms of energy that are changing?
Yes.
Brian W