It remained now for some great mathematical mind to pull this work all together and put it into universal laws.
At the age of twenty-three Isaac Newton moved from Cambridge to his country home. There his thoughts turned to the
problems of motion.
As Newton himself later told the story, he was sitting in the garden one evening, thinking, when he noticed a falling
The apple set him to wondering about the movement of falling things.
It occurred to him that the force which caused fruit to fall from trees worked quite as well at greater distances from
the center of the earth -- on top of buildings or even on top of mountains.
他想到那股使苹果从树上掉下来的力量在离开地心较远的距离同样有作用 -- 如在建筑物的顶上或在山顶上。
Perhaps, thought Newton, this same force reached out much farther still, even to the moon.
Was it this force which kept the moon going around the earth? And if so, could not the same force explain the
movements of the planets around the sun?
Newton began to search for a mathematical expression of his idea.
In 1669 Newton became professor of mathematics at Cambridge.
Three years later he joined the Royal Society.
The Royal Society was a group of learned men from all branches of science.
Before long Newton began again to study the problems of motion.
He had already discovered the essential ideas, but it still remained for him to solve the difficult mathematical
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