What force does the stool exert on the person in science class?

Understanding Forces in Science

In a science class, a person sits on a stool with a weight of 145 pounds. This weight exerts a downward force on the stool. The stool, in turn, exerts an equal and opposite force upwards on the person, known as the normal force. This normal force prevents the person from crushing the stool under their weight.

Explanation of Force Calculation: When the person sits on the stool, the force of gravity acting on their body is equal to their weight, which is 145 pounds. According to Newton's third law of motion, for every action, there is an equal and opposite reaction. Therefore, the stool exerts a normal force of 145 pounds upwards on the person to balance the force of gravity acting downwards.