The Law Of Gravity

The Law Of Gravity
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  • What kept the moon traveling in its orbit around Earth? Since the moon was in motion, why didn't it fall out of the sky in a straight line?
  • A single force explained a falling apple on earth and the movements of heavenly bodies. I call this force gravity!
  • All physical objects, had a force of attraction between them. The strength of the force depended on the masses of the objects and distance between them.
  • For example, the moon and the earth tugged on each other. At a certain point in space, these "tugs" canceled each other out. The result was the moon trapped in its orbit around the earth. In contrast,  an apple had a small mass and was very close to earth, so gravity dragged it to the ground.
  • The book Newton published, the Principia , presents the law of gravity. It also described three laws of motion. Newton's laws provided a physical explanation for what earlier scientists had discovered. For instance, others had shown that the planets traveling around the sun.
  • Newton's laws dramatically changed people's picture of the universe. Many people began to see the universe as a beautifully designed machine. Some compared it to a well built clock. The same mathematical laws applied everywhere. All people had to was discover them.
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