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When a person is sitting still in a chair, the action and reaction forces meet along his bottom.

The 'action' is directed downward and is the person's weight, the result of the gravitational

attraction between the Earth's mass and the person's mass. The 'reaction' is directed upward,

and is the force developed in the structural materials of the floor and the chair.

Since the action and reaction forces are equal and opposite, the net force on the person's

bottom is zero, and he does not accelerate vertically.

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Q: When a person sits on a chair what are the action and reaction?
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