It's almost always the last topic in the first semester of introductory physics—angular momentum. Best for last, or something? I've used this concept to describe everything from fidget spinners ...

Today I know: it’s all about angular momentum conservation. Angular momentum is a conserved physical quantity, similar to the way that energy is a conserved quantity. Roughly, it is a measure of ...

According to the law of conservation of angular momentum, the inner part of the disk should spin faster as the material spirals slowly inward toward the star, similar to how figure skaters spin ...

This rotation can be described as angular momentum, a conserved measure of its motion that cannot change. Conservation of angular momentum explains why an ice skater spins more rapidly as she ...

The orbital angular momentum (OAM) of electromagnetic waves — a kind of “structured light” — is associated with a helical or twisted wavefront. The helical modes are characterized by a ...