3. True or False: - Forces always occur in pairs. __ Action-reaction forces act on the same object. __ Action-reaction forces are equal in magnitude but opposite site in direction. __ __

* **Forces always occur in pairs. TRUE** This is a statement of Newton's Third Law of Motion.<br />* **Action-reaction forces act on the same object. FALSE** Action-reaction forces act on *different* objects. If they acted on the same object, they would cancel each other out and nothing would ever move.<br />* **Action-reaction forces are equal in magnitude but opposite in direction. TRUE** This is another key part of Newton's Third Law. For every action, there is an equal and opposite reaction.<br />