Here's why:
* Newton's Law of Universal Gravitation: This law states that the force of gravity between two objects is directly proportional to the product of their masses. This means that if you increase the mass of one object, the force of gravity will increase proportionally.
* Formula: The formula for gravitational force is:
```
F = G * (m1 * m2) / r^2
```
Where:
* F is the force of gravity
* G is the gravitational constant
* m1 and m2 are the masses of the two objects
* r is the distance between the centers of the two objects
As you can see, the force (F) is directly proportional to the product of the masses (m1 * m2). Therefore, if you increase m1, F will also increase.
Example:
Imagine you have two objects, A and B. If you double the mass of object A, the force of gravity between A and B will also double.
