The gravitational force between the Earth and the Moon is a force of attraction that keeps the Moon in orbit around the Earth. It is caused by the mass of the Earth and the Moon and it decreases as the distance between the two objects increases. The gravitational force is what causes tides on Earth, as the gravitational pull on the side of the Earth closest to the Moon is stronger than on the side furthest from the Moon. The gravitational force is what keep the Moon orbiting around the Earth and without it, the Moon would fly off into space.