Question

billy is sitting in a chair in class. if the action force is the downward push of his weight on the chair, what is the reaction force?
a. gravity
b. the downward force of billys weight on the earth
c. the upward force of the chair pushing on billy
d. the upward force of the earth on billy

Explanation:

According to Newton's third - law of motion, for every action, there is an equal and opposite reaction. The action is Billy's weight pushing downward on the chair, so the reaction is the chair pushing upward on Billy.

Answer:

C. the upward force of the chair pushing on Billy