Final answer:
To increase the gravitational force between two objects, you could increase the mass of one or both objects, or decrease the distance between them due to the direct and inverse square relationship in Newton's law of universal gravitation.
Step-by-step explanation:
If you wanted to increase the gravitational force between two objects, you could do this by either increasing the mass of one or both objects or decreasing the distance between them. This is because the gravitational force, F, according to Newton's law of universal gravitation, is directly proportional to the product of the masses (M1 and M2) and inversely proportional to the square of the distance, R, between their centers of mass. So the equation would look like this: Fgravity = G M1M2 / R2, where G is the gravitational constant.
For example, if you were able to double the mass of one object, the gravitational force would also double. However, if you were to reduce the distance between the two objects by half, the gravitational force would increase by a factor of four, since the distance squared in the denominator of the equation means the force increases with the inverse square of the distance.
Additionally, the concept of Extreme Gravity introduced you to dense objects, which due to their high mass in a small volume, exhibit strong gravitational forces. To practically increase gravitational forces, you could either switch one of the objects with a more massive one or move the objects closer to each other.