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Spinning Science: Centripetal Force Using Marbles in Jell-O: Scientific American - this is actually a really awesome demonstration for A2 Physics

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How Roller Coasters Work

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FUN Science Idea~ To help young physicists understand that for every action, there is an equal and opposite reaction you'll need these items: flexible straw, ruler, straight pin, marker, round balloon, masking tape, and pencil with eraser. Great way to teach air pressure and thrust!

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Centripetal Force Penny - spin the penny on the tip of a wire hanger | Experiments | Steve Spangler Science

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MARBLE GRAVITRON - SICK SCIENCE! Watch as physics makes a spinning marble defy gravity -- Steve Spangler Science