Final answer:
Newton's third law of motion involves a force pair acting on two different objects.
Step-by-step explanation:
Newton's third law of motion states that whenever one body exerts a force on a second body, the first body experiences a force that is equal in magnitude and opposite in direction to the force that it exerts. This law involves a force pair acting on two different objects. The forces exerted, commonly referred to as action-reaction pairs, are always equal in magnitude but opposite in direction.