View Single Post
jtbell
#3
Dec11-12, 09:21 PM
Mentor
jtbell's Avatar
P: 11,782
Quote Quote by bobbles22 View Post
Gravitational Potential Energy = Eg = (GMm)/r
You omitted a minus sign. In this situation, we consider Eg to be negative.

However, as it gets closer, the force from the Earth increased, as the separation 'r' off the objects decreases, the gravitational potential energy increases.
No, the gravitational potential energy decreases as the object approaches the Earth, the same as an object close to the Earth for which we usually use Eg = +mgh. Including a minus sign in your equation for Eg takes care of this.