# 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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