Newton's Third Law of Motion
For every action there is an equal and opposite reaction.
This law is exemplified by what happens if we step off a boat onto the bank of a lake: as we move in the direction of the shore, the boat tends to move in the opposite direction (leaving us facedown in the water, if we aren't careful!).
These actions are forces, so you can remember this law as being every force has an equal and opposite force. Remember that these are two seperate forces, wich act upon two seperate objects, and so they do not cancel each other out.
The Third Law at first seems simple, but is a very important law. Everytime we interact with our surroundings we feel the Third Law. When you punch someone in the face, your hand not only applies a force to the person's face; the person's face applies a force to your hand.
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