Gravitational Potential Energy and Differential Forces

Description
Potential energy due to a sphere at a point inside and outside is calculated. Meaning of differential forces has been explained along with an example of effect of tidal forces on a body. Weight and gravitational force and planetary motion has been discussed.

Prof. Stanley Kowalski, Physics 8.01 2003 Massachusetts Institute of Technology: MIT OpenCourseWare),http://ocw.mit.edu (Accessed Aug 4th,2011). License: Creative Commons BY-NC-SA: http://ocw.mit.edu/terms/#cc