What general rule can you write to explain the forces between objects of different mass?

Since gravitational force is inversely proportional to the square of the separation distance between the two interacting objects. if u look at the definition of force u get "strength or energy as an attribute of physical action or movement." and when you are talking about forces between two objects of a different mass u think of Force equals mass times acceleration [ ]. For every action there is an equal and opposite reaction. Every object in a state of uniform motion will remain in that state of motion unless an external force acts on it.