The concept of gravity
and gravitational force in relationship to mass
The gravitational force between objects depend on the masses of the object. Gravitational force is small between objects that have small masses. Gravitational force is large between objects that have large masses. The universal law of gravitation lets us predict what happens to gravity when mass change. For example, if there is a 5 newton force of gravity between objects and you double the mass of one object and leave the other the same, then the 5 newton force of gravity would double as well. Another example is if there is a 10 newton force of gravity between 2 objects and you divided the mass of one object in half and left the other the same, the force of gravity will also be divided in half. Objects with larger mass have more gravitational force. Objects with less mass have less gravitational force.