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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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