http://www.youtube.com/watch?NR=1&feature=fvwp&v=yN9NyevGir8
In this video, a girl is doing a figure skating trick called a triple axel. In the first few seconds of the video, she is gliding on ice at a constant speed because she caused herself to go that speed and the law of inertia states that an object in motion stays in motion and due to the lack of friction between the ice and the skates she stays in constant motion.
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