# What is angular momentum?

## What Does angular momentum Mean

Before entering fully into the meaning of the term angular momentum, we are going to proceed to know the etymological origin of the two words that give it its shape:

-Moment, in the first place, comes from Latin. Exactly it emanates from the word "momentum", which can be translated as "impulse", "movement" or "frequency.

-Angular, secondly, derives from the Greek. In his specific case, the word "ankulus", which is synonymous with "bent".

The idea of angular momentum , which leads us to enter the world of physics and mechanics , refers to a vector quantity that allows us to refer to the state of rotation of a body . Also called kinetic momentum , it can be linked to a rigid solid or a point particle.
In the case of a rigid solid that rotates on an axis, the angular momentum is equal to the resistance exerted by the body in question to the change in angular velocity (the angle rotated per unit of time). It is important to mention that, under certain conditions, the angular momentum remains constant while the system changes.

The angular momentum of a mass or point particle with respect to a spatial point, meanwhile, is defined as the moment of its momentum taking that point into account. In other words: it is the result of multiplying its position vector by the linear momentum.
To clearly understand what angular momentum is, it can be considered that it allows characterizing the state of rotation of a point such as the linear momentum refers to the state of translation in line. The angular momentum, in this framework, is calculated starting from a position vector and a point particle that has instantaneous velocity (that is, it is in motion).
As can be seen, the angular momentum is not a quantity that "belongs" to the body, in the sense that it is not its own. On the contrary, the angular momentum will always depend on a reference point that is taken.
When it comes to calculating the angular momentum of a material point, it is necessary to take into account elements such as the position vector of the body with respect to what point O is and what is the linear movement or momentum of the Body.
Among the angular moments that can be calculated is, for example, that of a satellite that is at a certain distance from the Earth with respect to its center.
It is also necessary to determine that there are two different types of angular momentum: orbital angular momentum and internal angular momentum. To calculate the first one must take into account the moments of the external forces and also the center. To do the same with the second, both what the O is and these external forces must be taken into consideration.

Many are the scientists and mathematicians who have studied the subject of the angular momentum. However, among the most significant is the German mathematician Emmy Noether.

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