* The more massive the objects, the stronger the gravitational force between them.
* If you double the mass of one object, you double the gravitational force.
* If you double the mass of both objects, you quadruple the gravitational force.
This is expressed in Newton's Law of Universal Gravitation:
F = G * (m₁ * m₂) / r²
Where:
* F is the force of gravity
* G is the gravitational constant (a very small number)
* m₁ and m₂ are the masses of the two objects
* r is the distance between the centers of the two objects
So, you can see that the force of gravity is directly proportional to the product of the masses (m₁ * m₂).
