21 November 2022 3 8K Report

Friction is generally not included in Lagrangian and Hamiltonian treatments of energy mechanics. It is usually defined as energy ``lost'' (inability to do work) during interactions of bodies. It is mathimatically modeled, but what it is in unstated. The answer is probably dependant on your model, so what is your model (200 characters or less). An allied question may be: what is heat at the quantum level of particle interaction? As I understand some ``mass '' as in mc^2 is lost but there is no particle characteristic of the lost mass. So, what is this lost mass?

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