Newton's Third Law of Motion
All forces act in pairs. If a force is exerted, another force occurs that is equal in size and opposite in direction. The law itself addresses only forces. But the way that force pairs interact affects the motion of objects. A force is always exerted by one object on another object. This rule is true for all forces, including action and reaction forces. However, action and reaction forces in a pair do not act on the same object. If they did, the net force would always be 0 N and nothing would ever move. The action force was exerted on the water by the swimmer's hands by the water. The forces did not act on the same object. Some examples of forces that act in pairs are a rabbit when its jumps, or the bat and the baseball.