# Relativistic Mass

• (noun): (physics) the mass of a body in motion relative to the observer: it is equal to the rest mass multiplied by a factor that is greater than 1 and that increases as the magnitude of the velocity increases.

### Some articles on relativistic mass, mass, relativistic:

Relativistic Mass Distortion
... Mass in special relativity incorporates the general understandings from the concept of mass-energy equivalence ... resulting from the fact that "mass" is defined in two different ways in special relativity one way defines mass ("rest mass" or "invariant mass") as an invariant quantity which is the ... The term mass in special relativity usually refers to the rest mass of the object, which is the Newtonian mass as measured by an observer moving along with ...
Relativistic Mechanics - Dynamics - Momentum - Relativistic Mass
... The quantity is often called the relativistic mass of the object in the given frame of reference ... This makes the relativistic relation between the spatial velocity and the spatial momentum look identical ... written exactly like their classical analogues by only replacing the mass with the relativistic mass ...
History Of Special Relativity - Special Relativity - Early Reception - Relativistic Momentum and Mass
... Planck (1906a) defined the relativistic momentum and gave the correct values for the longitudinal and transverse mass by correcting a slight mistake of the expression given by Einstein in 1905 ... Based on the work of Planck, the concept of relativistic mass was developed by Gilbert Newton Lewis and Richard C ... Tolman (1908, 1909) by defining mass as the ratio of momentum to velocity ...
Mass
... In physics, mass (from Greek μᾶζα "barley cake, lump (of dough)"), more specifically inertial mass, is a quantitative measure of an object's resistance to acceleration ... In addition to this, gravitational mass is a measure of magnitude of the gravitational force which is exerted by an object (active gravitational mass), or experienced by an object (passive ... The SI unit of mass is the kilogram (kg) ...
Relativistic Mass Distortion - The Relativistic Mass Concept - Relativistic Mass
... In special relativity, an object that has a mass cannot travel at the speed of light ... following Lorentz and Einstein, the terms longitudinal and transverse mass were still in use ... However, those expressions were replaced by the concept of relativistic mass, an expression which was first defined by Richard C ...

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