Question

What are the application of gravity?

Answer 1

The satellite must be experiencing a force since it is accelerating. That force turns out to be gravity. ... Newton went on to quantify the amount of the change that would be observed from the application of a given force. In Newton's second law of motion, he said that the force applied = mass of an object × acceleration.

Answer 2

Gravity, or gravitation, is a natural phenomenon by which all things with mass or energy—including planets, stars, galaxies, and even light[1]—are brought toward (or gravitate toward) one another. On Earth, gravity gives weight to physical objects, and the Moon's gravity causes the ocean tides. The gravitational attraction of the original gaseous matter present in the Universe caused it to begin coalescing, forming stars – and for the stars to group together into galaxies – so gravity is responsible for many of the large scale structures in the Universe. Gravity has an infinite range, although its effects become increasingly weaker on farther objects.
I think you understand