Gravitational potential energy formulas

  • #1
m.g.h = (GMm)/r how can we prove that mgh is potential energy and both equal to that???
 

Answers and Replies

  • #3
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You kind of have to watch out. when you use U = mgh, your zero of potential energy is at h = 0.

when you use the other equation, the zero of potential energy is at r = infinity.

m gh is based on a constant gravity (or flat Earth assumption) good for local physics

the other equation is based on a inverse square gravity. good when far from Earth center.
 

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