sentence: Gravity is the force that causes things to fall down.
sentences_before: He described laws of motion and gravitation. These laws are math formulas that explain how objects move when a force acts on them. Isaac published his most famous book, Principia, in 1687 while he was a mathematics professor at Trinity College, Cambridge. In the Principia, Isaac explained three basic laws that govern the way objects move. He then described his idea, or theory, about gravity.
sentences_after: If a pencil fell off a desk, it will land on the floor, not the ceiling. In his book Isaac also used his laws to show that the planets revolve around the suns in orbits that are oval, not round.
concept_name: gravity
headings: Isaac Newton Early life Early workings
categories: 1643 births 1727 deaths English mathematicians English physicists English science writers Fellows of the Royal Society People buried in Westminster Abbey People from Lincolnshire Presidents of the Royal Society