Gears were an integral part of early engineering and played a role in the industrial revolution helping crate things like the Coto jin or the steam engine. Gears have but one use: to move different parts of a mechanism at differing or the same speed as the driven force. They take advantage of something called mechanical advantage. "Mechanical advantage is the ratio of output force to input force in a system."[vedantu, 2004]. In: (https://www.vedantu.com/physics/types-of-gears), you can find the math used to calculate the mechanical advantage. Over time gears have evolved from simple teeth gears to more complex ones such as spiral gears, intersectin shaft gears, parallel gears, etc. Today they have their place in mechanical watches, cars, and other mechanically moving creations.
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