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Angular momentum
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== Angular momentum in engineering and technology == [[File:Video of a complete use session with a gyroscopic exercise tool.webm|thumb|Video: A [[gyroscopic exercise tool]] is an application of the conservation of angular momentum for muscle strengthening. A mass quickly rotating about its axis in a ball-shaped device defines an angular momentum. When the person exercising tilts the ball, a force results which even increases the rotational speed when reacted to specifically by the user.]] Examples of using conservation of angular momentum for practical advantage are abundant. In engines such as [[steam engines]] or [[internal combustion engines]], a [[flywheel]] is needed to efficiently convert the lateral motion of the pistons to rotational motion. [[Inertial navigation system]]s explicitly use the fact that angular momentum is conserved with respect to the [[inertial frame]] of space. Inertial navigation is what enables submarine trips under the polar ice cap, but are also crucial to all forms of modern navigation. [[rifle|Rifled bullets]] use the stability provided by conservation of angular momentum to be more true in their trajectory. The invention of rifled firearms and cannons gave their users significant strategic advantage in battle, and thus were a technological turning point in history.
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