Final answer:
Forces that come in pairs are called action-reaction pairs as per Newton's third law of motion.
Step-by-step explanation:
Forces that come in pairs are called action-reaction pairs. According to Newton's third law of motion, forces in nature always occur in pairs of equal and opposite magnitude. This means that if a force is exerted on an object, it must be exerted by something else, and the object will exert an equal and opposite force back on that something. These force pairs are referred to as action-reaction pairs.