In this situation, the forces are balanced because they are equal in magnitude but opposite in direction. The force of gravity pulling you down (action force) and the normal force from the chair pushing you up (reaction force) are equal, resulting in no net force acting on you. Therefore, you remain at rest in the chair.
In this situation the force of gravity pulling you down (action force) and the force of the chair pushing back up (reaction force) are:
Unbalanced because the force of the chair is greater
Balanced because they are both equal
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