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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  • 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