In this chapter, he explains about the birth of our ideas of motion of bodies. He begins with Aristotle, who said a body was at rest unless driven by a force or impulse. BUT he went on to say that heavier bodies fell faster than lighter bodies because the pull should be greater on the heavier object than the lighter one. Galileo eventually looked back on this and disproved his theory of the heavy and the light objects having different velocities. He rolled balls of different weight down a smooth slope (this method was equivalent to that of dropping two objects of different weight) and proved that "each body increased its speed at the same rate, no matter what its weight [was]".
Newton took this idea and used it to found his laws of motion. These famous three laws of motions are still widely used today. Newton also discovered another very famous concept in science: Gravity. This is what Stephen Hawking will use in the novel in order to explain more theories and answer some of the questions that there are.
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