Final answer:
When a person stands at rest on the floor, the forces that act upon them are gravity, normal, and friction.
Step-by-step explanation:
When a person stands at rest on the floor, several forces act upon them. The first force is gravity, which pulls the person downward towards the center of the Earth. The second force is the normal force exerted by the floor, which pushes upward on the person to counteract the force of gravity. Finally, there is a force called friction that opposes the motion of the person's feet when they try to move.
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