# What is angular momentum?

A rotating object's moment of inertia times its angular velocity.

### The angular momentum of the earth is constant?

More or less. There is a law of conservation of angular momentum, according to which Earth can't gain or lose angular momentum on its own - if for example it loses angular momentum, it has to go somewhere. A meteor who falls into the Earth, or a rocket leaving the Earth can change Earth's angular momentum - but the total angular momentum (e.g., of the system meteor + Earth) is the same, before and after…

### If something shrinks in size but not in mass what happens to its angular momentum?

Angular momentum is maintained in such a case - and in fact in all cases, unless angular momentum is transferred to, or from, another body. This means it must rotate faster. Angular momentum is maintained in such a case - and in fact in all cases, unless angular momentum is transferred to, or from, another body. This means it must rotate faster. Angular momentum is maintained in such a case - and in fact in…

### How does mass affect angular momentum?

Short answer: Angular momentum is proportional to mass. If you double the mass of an object, you double its angular momentum. Long Answer: Angular Momentum is a characteristic of rotating bodies that is basically analogue to linear momentum for bodies moving in a straight line. It has a more complex definition. Relative to an origin, one obtains the position of the object, the vector r and the momentum of the object, the vector p, and…