Angular Momentum
lastmod 2014-09-03created 2014-09-031 edits
In physics, angular momentum is a physical quantity that represents the degree to which linear momentum rotates about some origin. Because angular momentum depends on how the origin of the coordinates is chosen, when dealing with multiple angular momenta, you must carefully consider whether adding them or performing related operations on them is physically valid.
Angular momentum is a very important concept not only in physics but also in many engineering fields, and its applications are also very diverse. Angular momentum is treated as important because it is a conserved quantity when no torque acts. According to Noether's theorem, the conservation of angular momentum is due to the rotational symmetry of space. This conservation of angular momentum is useful not only in engineering but also in describing many natural phenomena.