so, the book Principia Mathematica was published by Isaac newton on the fifth of July, 1687.in this book, Newton stated the three universal laws of motion. together, these laws basically describe all of how normal matter interacts with other matter. they contributed many advances that were useful in the industrial revolution. he also defined the law of universal gravitation( which is defined with the formula F=GMmr2F=GMmr2 where G is the gravitational constant.) that basically sais that if you are farther away from a very heavy object, the less gravity you feel. newton named this force gravitas, the Latin word for weight. this “gravitas” became gravity.

cool!!!!

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