- #1

Saptarshi Sarkar

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- TL;DR Summary
- Why does STR leave out Potential Energy while Classical and Quantum Mechanics don't?

While studying Special Theory of Relativity I came across the formula for the energy of a particle. The total energy of a relativistic particle in STR contains the Rest Mass energy and the Kinetic energy. But, in Classical and Quantum Mechanics, we consider the total energy of the particle to be the sum of the Kinetic Energy and the Potential Energy.

Why does STR not include the potential energy in the total energy of the particle?

Why does STR not include the potential energy in the total energy of the particle?