Gravity
Tie gravitational force at the surface of the planet is the force that binds all bodies to earth, this force is one of the four forces recognized by physicists, and this kind of force is known as “gravity” it attracts every celestial object to earth, and though it is the most important of the forces essential for our lives, it is the least comprehended of them all throughout ages scientists have tried to solve the mystery of gravity, and one of the first discoveries concerning gravity was made by Aristotle who concluded from his experiments that the downward movement of any body is that has weight had a proportional relationship between its quickness in motion and its size. However, this theory was accepted for centuries, but after a series of experiments made by Galileo, Aristotle’s theory was proved to be incorrect, as Galileo said after a series of experimenting at the Pisa Tower that bodies of different sizes fall with the same speed.
