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I-How Does Gears Work You see gears in just about everything that has spinning parts For example car engines and transmissions contain lots of gears Gears are generally used for one of four different reasons 1- To reverse the direction of rotation 2- To increase or decrease the speed of rotation 3- To move rotational motions to a different axis 4- keep the rotation of two axis synchronized Most of the gears you see in real life have teeth The teeth have three advantages 1-They prevent slippage between the gears Therefore axles connected by gears are always synchronized exactly with one another 2-They make it possible to determine exact gear ratios you just count the number of teeth in the two gears and divide So if one gear has 60 teeth and another has 20 the gear ratio when these two gears are connected together is 31 3-They make it so that slight imperfections in the actual diameter and circumference of two gears dont matter The number of teeth controls the gear ratio even if the diameters are a bit off Circumference of a circle is equal to the diameter of the circle multiplied by Pi Pi is equal to 314159 To create large gear ratios gears are often connected together in gear trains as shown here The right-hand green gear in the train is actually made in two parts as shown A small gear and a larger gear are connected together one on top of the other Gear trains often consist of multiple gears in the train as shown in the following two figures In the case above the green gear turns at a rate twice that of the red gear The blue gear turns at twice the rate as the green gear The yellow gear turns at twice the rate as the blue The gear train shown below has a higher gear ratio In
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