The force of gravity between two objects depends on what and what

The force of gravity between two objects depends on mass of both objects and distance between their centres.

Explanation:

According to the Law of Gravitation,

     Thus,          

     And,                  

Hence from above it is clear that Force of gravity between two objects varies directly with the mass of both objects and indirectly with the distance between their centres.

current and voltage can both be different in different parts of a circuit so it matters where you place the ammeter and voltmete