### Tag: Newtonian

Newtonian, Lagrangian and Hamiltonian mechanics are not equivalent

## Newtonian, Lagrangian and Hamiltonian mechanics are not equivalent

TL;DR – Particle under friction is Newtonian, but neither Lagrangian or Hamiltonian. Photon as a particle is Hamiltonian, but neither Lagrangian or Newtonian. After taking a course in advanced mechanics, one is often left with the impression that Netwonian, Lagrangian and Hamiltonian mechanics are all equivalent. Unfortunately, while this is often what a book would …