The first semester of an undergraduate physics course invariably spends a lot of time on two big ideas: The momentum principle and the work energy principle. Both deal with forces acting on an object, ...

Scientists have directly watched angular momentum move through a crystal for the very first time — and discovered a bizarre twist along the way. Using ultra-powerful terahertz laser pulses, ...

When a magnetic material is bombarded with short pulses of laser light, it loses its magnetism within femtoseconds (10 –15 seconds). The spin, or angular momentum, of the electrons in the material ...

Consider the following physics problem. An object with a mass of 1 kg and a velocity of 1 m/s in the x-direction has a net force of 1 Newton pushing on it (also in the x-direction). What will the ...

It has been known for more than a century, since the seminal works by J.H. Poynting 1, that light carries momentum and angular momentum (AM) 2,3. These are the main dynamical properties of ...

Occasionally we come across a problem in classical mechanics that poses particular difficulties for translation into the quantum world. A new mathematical model has provided some insights into one of ...