Final answer:
The gravitational force between two objects increases as they move closer together because the force is inversely proportional to the square of the distance between them, per Newton's Law of Universal Gravitation.
Step-by-step explanation:
As two objects move toward each other due to gravitational attraction, the force between them increases. This is because the gravitational force is directly proportional to the product of the masses of the two objects and inversely proportional to the square of the distance between them. As the objects move closer together, the distance between them decreases, thus increasing the gravitational force according to Newton's Law of Universal Gravitation.