Newton's Third Law: For every force there is an equal and opposite force. ( I've already complained about the way most books talk about this one ) Yes, some books do it a little different---but ...

Newton’s third law says that forces act in pairs. Which means if you push on something, it pushes it back on you. That’s why if you are sitting down and push on your desk, you will move.

Newton’s Third Law: Newton’s 3rd Law is introduced in this lesson, and the law is applied to everyday situations. Aired 02/04/2002 | Rating NR. Problems playing video?