# Relativistic Energy

Written by Jerry Ratzlaff on . Posted in Relativity

Classical physics says that, in a system, the total amount of energy remains constant.  Energy is still conserved relativistically, but to include the possibility of mass changing to energy, its definition changes accordingly.  To conserve the energy in all inertial frames, relativistic energy is purposely defined in such a way that it will be conserved similarly, as is the case for relativistic momentum.

Tags: Energy