Tests of relativistic energy and momentum

**Kinetic energy in special relativity and Newtonian mechanics.** Relativistic kinetic energy increases to infinity when approaching the speed of light, thus no massive body can reach this speed.

Tests of relativistic energy and momentum are aimed at measuring the relativistic expressions for energy, momentum, and mass. According to special relativity, the properties of particles moving approximately at the speed of light significantly deviate from the predictions of Newtonian mechanics. For instance, the speed of light cannot be reached by massive particles.

Today, those relativistic expressions for particles close to the speed of light are routinely confirmed in undergraduate laboratories, and necessary in the design and theoretical evaluation of collision experiments in particle accelerators.^[1]^[2] See also Tests of special relativity for a general overview.

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