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Energy is neither created nor destroyed: Kinetic and potential energy are often paired together in simple demonstrations, like dropping a book, jumping on a trampoline, or building cool machines like rubber band cars. Try the experiment with different sized cups, or different sized rubber bands to see if the speed or behavior of your racer changes. This same machine can be made with a plastic trashcan, a broomstick, and a bungee cord. Elastic potential energy is stored in the rubber band when you use the straw to twist it up. When the rubber band is released, the potential energy built up in twisting gets unloaded and turned into mechanical energy. The chopstick pushes against the ground as the rubber band unwinds so that the only place the mechanical energy has left to go is into the cups in the form of torque, or force around an axis.
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In I fact, you just can't picture what it's like to "poke Ii fish" in Hawaii until you've which is fired by rubber bands arranged on the same principle as a sling shot. xichlo.info: HAWAIIAN SLING POLE SPEAR REPLACEMENT BAND CORD Scuba Choice 3/8" Black Rubber Fishing Hand Speargun Pole Spear Sling.
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