Isaac's father was a wealthy farmer, who died three months before Newton was born. His mother remarried and Newton was left in the care of his grandparents.
Isaac Newton went to Cambridge University in 1661 to study Mathematics and Science.
What is gravity? I am going to wait till an apple is going to fall down to see what gravity is.
Newton understood that gravity was the force of attraction between two objects. He also understood that an object with more matter –mass- exerted the greater force, or pulled smaller object toward it. That meant that the large mass of the earth pulled objects toward it. That is why the apple fell down instead of up, and why people don’t float in the air.
He thought that maybe gravity was not just limited to the earth and the objects on it. What if gravity extended to the moon and beyond?
Isaac calculated the force needed to keep the moon moving around the earth. Then he compared it with the force the made the apple fall downward. After allowing for the fact that the moon is much farther from the earth, and has a much greater mass, he discovered that the forces were the same. The moon in held in an orbit around earth by the pull of earth’s gravity.