system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What exactly is angular momentum and how does it work?

Everything I have read explains angular momentum with lots of physics jargon way above my head.  Anyone have a simple explanation out there?
gpt
Momentum is a measure of how hard it is to stop something that is moving. A tennis ball is easier to stop than a basketball. A spoon thrown at you is easier to stop than a bullet. Momentum depends on two things, the weight (actually mass) of the thing and the speed (actually velocity) with which it is moving. A moving bus has more momentum than a bicycle for instance. 

All of these examples have one thing in common though. They are all objects moving in a line - the corresponding momentum is called linear momentum. There is another type of momentum, angular or rotational momentum, that is possessed by objects that are turning. A spinning coin is easier to stop than a massive carousel. Again, it is a measure of how hard it is to stop something spinning, and again depends on the mass of the object and the speed with which it is rotating (angular velocity).