Rest (physics)

Rest (physics)

Rest (sometimes called absolute rest) in physics and in the technical sense of geometric mensuration denotes a particular relation between a pair of observers. By Albert Einstein's celebrated definition, two observers measure having been "at rest to each other" in any particular trial if they succeed to identify a third observer as middle "between" each other, in that trial.

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  • rest energy — Physics. the energy equivalent to the mass of a particle at rest in an inertial frame of reference, equal to the rest mass times the square of the speed of light. [1935 40] * * * …   Universalium

  • rest mass — Physics. the mass of a body as measured when the body is at rest relative to an observer, an inherent property of the body. Cf. relativistic mass. [1910 15] * * * …   Universalium

  • rest mass — n. Physics the mass of a body when its velocity is zero: according to one view of the special theory of relativity, an object s mass increases as its speed increases …   English World dictionary

  • physics — /fiz iks/, n. (used with a sing. v.) the science that deals with matter, energy, motion, and force. [1580 90; see PHYSIC, ICS] * * * I Science that deals with the structure of matter and the interactions between the fundamental constituents of… …   Universalium

  • rest mass — noun (physics) the mass of a body as measured when the body is at rest relative to an observer, an inherent property of the body • Topics: ↑physics, ↑natural philosophy • Hypernyms: ↑mass * * * noun Etymology …   Useful english dictionary

  • PHYSICS — The material presented in this entry emphasizes those contributions which were important in arriving at verified present day scientific results, rather than those that may have appeared important at the time. Unavoidably it will overlap in parts… …   Encyclopedia of Judaism