Filmed at 1000 fps, balls can be seen to compress as they are kicked.
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Throws a ball straight up in your own reference frame and you will catch it on the way down.
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A disc and a ring with the same mass and diameter have a race!
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Two physical pendulums rotate about different centres but have the same period of oscillation.
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While a simple mass on a spring has only one oscillation mode, multiple masses and springs has several different modes.
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