An object of mass m sits on a flat table. The Earth pulls on this object with force mg, which we will call the action force. What is the reaction force?
A) The table pushing up on the object with force mg.
B) The object pushing down on the table with force mg.
C) The table pushing down on the floor with force mg.
D) The object pulling upward on the Earth with force mg.
E) The table pulling upward on the Earth with force mg.

Question

Quizplus · Accepted Answer

According to Newton's third law, every action has an equal and opposite reaction. If the Earth pulls the object downward with force mg, the object pulls the Earth upward with the same force mg.

An Object of Mass M Sits on a Flat Table