View Full Version : Which one?

2006-Feb-20, 06:33 AM

Some days ago when I was reading a book on Gravitational Field and Potential, I saw this formula:

Gravitational Potential Energy = -G (M+m) m/d

([M] and [m] are the masses of the two objects, [G] is the gravitational constant and [d] is the distance between their centers.)

In other books I saw another formula (-GMm/d).
What is the difference between these two formulas and which one is the correct one ??

2006-Feb-20, 09:29 AM
If M if much larger than m, they are the same formula. The first one is more accurate.