Question

The law that states that when one object exerts a force on a second object, the second object exerts a force of the same size but in the opposite direction on the first object is

law of motion

Answer 1

The law you are referring to is known as **Newton's Third Law of Motion**. It states that for every action, there is an equal and opposite reaction. This means that if one object exerts a force on another object, the second object will exert a force of equal magnitude but in the opposite direction on the first object.