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What Is F Equals MA?
Isaac Newton gave everyone the rule for gravity and derived the motion of the planets in the context of his theory of classical mechanics. His theory was so good that people, since the 1600s, basically took for granted that it was exactly right and would be right forever. It wasn't until the 19th century and the beginnings of relativity and then the 20th century with the invention of quantum mechanics that Newton's system was really overturned.