Gravitational potential

3.3  Gravitational potential:

1. Defining gravitational potential  V by  gravitational work              Units            GPE = mass * V      

2. Gravitational potential of a point particle          Gravitational potential of spherical body

3.           vcircular = sqrt (gravitational potential)        vescape = sqrt(2)*vcircular

4. g = - ( gradient of V )        V(x) and g(x) for 3 planets 

5. Visualization of gravitational potential  by equipotential lines