Question

what forces are acting on the man? force of the chair up and gravity down. force of friction to the left. inertia. force of gravity only.

Explanation:

According to Newton's first law, when an object is at rest or in uniform motion, the forces acting on it are balanced. In this case, the man is in a state of rest relative to the chair. The force of the chair pushing up (normal force) balances the force of gravity pulling down. There is no indication of motion to the left, so friction to the left is not applicable. Inertia is a property, not a force. And it's not just gravity acting as there is a normal force from the chair.

Answer:

Force of the chair up and gravity down.