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F r e e m u s i c d o w n l o a d s f o r C e r t i f i e d m e m b e r s : w w w. a b m p . c o m / g o / c e r t i f i e d c e n t r a l 79 Attempting to step onto a fl oating platform. This situation illustrates how much we take Newton's Third Law for granted. Whenever we want to take a step—that is, push our body away from one location—we do so by pushing into the ground, trusting implicitly that the ground will push us back and away. But in this case, the "ground" (canoe) has a similar amount of inertia as your body. What's more, the surface of the water affords very little friction against the boat's hull to resist your applied action. The result (reaching back to our discussion of Newton's Second Law) is that both parties accelerate away from each other. Law of action-reaction on the court. Take a walk in the park and you'll see this law everywhere. Actually, the simple act of walking in the park illustrates it as your shoes push against the ground and the ground pushes up against your shoes. On the grass is a boy fl ying a kite (Image 9); observe the tug-of-war not only between his hands and the string, but also between the kite and the wind. Stop to watch a pickup game of basketball and note the action- reaction dynamic between the player's dribbling hand and the ball (Image 10). Finish your walk and step into a Pilates class. Feel the force of your muscles and fascia act and react to the spring-loaded machines. accelerate away from each other. Flying a kite. 9 10 8