My daughter loves to play hit the ball. This is where we take turns throwing a ball while the other one hits the ball with some plastic thing that vaguely looks like a tennis racket.
Law 1: The plastic ball we play with, lying still on the bedroom floor.
Law 2: One of picking up the ball and tossing it towards the receiving racket. The velocity of course depending on which of us has thrown the ball.
Law 3: The contact between the ball and racket.
Generally law 3 leads back to law 2 as the velocity of the ball has now changed due to the interaction with the racket. Most often the ball hits me, law 3 again, unless I dodge it (which I usually don't because lets face it, the ball is plastic and she thinks it's hilarious for it to hit me.... and then I fall over). And here we are back at law one as the ball slowly comes to a rest on the floor.
Well it made for a great story... I hope I have the concept right :)
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