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The Third Law of Motion is all about action reaction! Your action is pushing up against wall, and the equal and opposite reaction is staying where you are because if it didn't push back on you, you would fall through the wall. An action is when you put something in motion, a reaction is the motion that acts back on your action. If you have a basketball and two people apply force to the basketball in the same direction they cannel each other out because it is a horizontal force. The direction the arrows are facing determines which way the force is going.