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Gerard R


Date added:

December 1, 2013








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Today we also have windmills, called "wind turbines," that generate electricity. All machines are a combination of several simple machines or modifications of one. A simple machine is one that is moved by just one force. The six types of simple machines are the lever, the wheel and axle, the pulley, the inclined plane, the wedge, and the screw...
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A lever is a long plank, beam or bar that is used to move heavy loads. Examples of a lever are seesaws, scissors, broom, tweezers, and ice-tongs. A wheel is a cylindrical object that rotates about axis of the cylinder. Wheels are on cars and trains. Some wheels turn other wheels, like geared wheels on a bicycle or a clock...
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