Question

When you sit on a chair, what is the reaction force to your weight the downward action force

Answer 1

When you sit on a chair, your weight exerts a downward force on the chair due to gravity. According to Newton's third law of motion, for every action, there is an equal and opposite reaction. The reaction force to your weight is the normal force exerted by the chair upward against your body. This upward force is equal in magnitude and opposite in direction to the downward force of your weight, assuming the chair is not accelerating. Therefore, if you weigh 150 pounds, the chair exerts an upward force of 150 pounds on you.