Gravitational acceleration ( g ) 

The acceleration gained by a body in free fall as a result of the gravitational pull. 

It will differ from one location to the next. 

Value of g=9.8 m/s²

Constant of Universal Gravitation ( G ) 

The attraction between two bodies of equal mass separated by an equal distance in any part of the universe. 

Anywhere in the universe, there is a constant. 

Value of G=6.673×10-11 Nm²/kg²