Did you know that when you sit down and apply a force on a chair, that the chair is actually pushing a force back on you. Well Newton wondered the same thing. He discovered that for every action there is a equal and opposite reaction. This is known as Newton's Third Law of Motion. Newton discovered this law of physics, along with two other laws throughout his life. This website will help you understand Newton's Third Law better and learn more about Newton. There are many action and reaction pair images to help clear things up.
