Can anyone explain to law of conservation of angular momentum in simple terms?
The idea is that if you have a system that is isolated from outside influences that could change its angular momentum, the total angular momentum of everything in the entire system always adds up to the value it starts with, even if parts of the system move around and interact in a variety of ways. If one part of the system gains some angular momentum ( say, for example, there’s some gizmo attached to it that gives it a twist) then some other part of the system will lose an equal amount of angular momentum so the total remains the same. The reason angular momentum is conserved is that when one object exerts a torque on another, that other object always exerts an opposite torque on the first. This causes equal and opposite changes in angular momentum that always add up to no net change.
