A mechanism that I find very useful is the one used in the transmission of cars. To put it simply, they convert the motion of the engine into the rotary motion of the wheels by using various gears and gear trains. In this way, the output power of the car is controlled more easily by the driver, who does simple motions in order to change gears. Each set of gears has its speed limits, so the driver or a computer system must choose the ideal gear every time.
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