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, ...

Students learn to define, give the MKS units for, and calculate momentum. Momentum: Students learn to define, give the MKS units for, and calculate momentum and to use the impulse equation to explain ...

The understanding of excitations is crucial for any physical system. In particular, it is important in many-body physics to characterize a system’s response in different regimes to obtain information ...

The rapidly growing field of research on chiral phonons is giving researchers new insights into the fundamental behaviors and structures of materials. The chirality of phonons could pave the way for ...