Newton's Third Law

Newton's Third Law

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  • Hey Susi! How come you don't fall on the ground when you sit on your chair? Shouldn't gravity pull both forces toward the ground?
  • Oh, you don't know Newton's third law of motion?
  • No, I never learned it during school! Can you please explain it to me?
  • Newton's third law explains that if object A exerts a force on object B, then object  B must exert a force of an equal magnitude and opposite direction back on object A. 
  • Oh, I get it! So right now, you are exerting a downward force on the chair and the chair is exerting an upward force on your body. That's why gravity can't pull both objects all the way down.
  • Yes! The whole idea of Newton's third law states that for every action there is an equal and opposite reaction. So the chair is exerting its upward force on me and I am exerting my downward force on it. 
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