According to the universal law of gravitation, the force of gravitation between two objects is given by $F=\frac{G M m}{r^{2}}$

$(i)$ $F$ is directly proportional to the masses of the objects. If the mass of one object is doubled, then the gravitational force will also get doubled.

$(ii)$ $F$ is inversely proportional to the square of the distances between the objects. If the distance is doubled, then the gravitational force becomes one-fourth of its original value.

Similarly, if the distance is tripled, then the gravitational force becomes one-ninth of its original value.

$(iii)$ $F$ is directly proportional to the product of masses of the objects. If the masses of both the objects are doubled, then the gravitational force becomes four times the original value.