The story commonly told is that Newton saw an apple falling from a tree and discovered gravity while thinking about the forces of nature. Another version says that the apple landed directly on his head. Either way, Newton realized that there must be some force acting upon all objects, causing them to fall.
He also considered the moon which should actually fly away from Earth in a straight-line tangent to its orbit if there hadn’t been a force binding it to Earth. He concluded that the moon is a projectile rotating around the Earth due to gravitational force.
Newton called this force ‘gravity’, something that pulls everything to the ground. The weight of an object is the measurement of the strength with which it is being pulled by gravity. Or in other words, gravity gives weight to physical objects. The reason we can keep our feet firmly on the ground and walk around is gravity. It is what stops objects from flying off into space.
Gravity is the force that had the effect of pushing on the planets and was equal to the pull of the sun. It is in fact responsible for many of the large-scale structures in the universe. Newton also explained the astronomical observations of Kepler using the concept of gravity.
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