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	10 results 20 results 30 results 50 results Principle of relativity In general, the principle of relativity is the requirement that the laws of physics be the same for all observers. Somewhat more particularly, the measurements an observer makes in his frame of reference of an important event are related in a particular way to those made by another observer. Several principles of "relativity" have been developed, starting with the Galilean version. Galileo and others considered only inertial reference frames (see the discussion of such frames in frame of reference) in uniform translation relative to each other. The measurement of time was assumed to be the same for all observers, but the measurements of distance made by an observer differ from those by another depending on the relative velocity between the observers' frames of reference. The measurements made by one can be transformed to those by another one. Such a transformation is called the Galilean transformation. Einstein saw, however, that if the vacuum speed of light was really the ultimate velocity in our physical world, a different kind of transformation was called for. If information about an important event cannot reach us faster than light (or any form of electromagnetic phenomenon) can, the Galilean assumption of universal time has to be discarded. The transformation of an observer's measurements to another observer's measurements, now changed, is called the Lorentz transformation. For details, see theory of relativity and special relativity. General relativity extended the principle of relativity to accelerated frames of reference in a gravity field. FAVORITE ARTICLES: History of the World    History of the United States    History of Europe    Ancient History    History    Military History    World War I    Bombing of Dresden    California    US Constitution    Frank Sinatra    Boston    Marbury v. Madison This article is licensed under the GNU Free Documentation License at http://www.gnu.org/copyleft/fdl.html You may copy and modify it as long as the entire work (including additions) remains under this license. You must provide a link to http://www.gnu.org/copyleft/fdl.html To view or edit this article at Wikipedia go to http://www.wikipedia.org/wiki/Principle_of_relativity">follow this link. All other content is copyright © 2000-2005 by WorldHistory.com. All rights reserved.   Sponsored Links Find lost family and friends FREE 14 Day Subscription to Ancestry.com! 12 CDs for 1 at BMG Music Service US Private Schools directory US Public Schools Directory BlueHost offers 1 GB of Web site space as low as $6.95 per month. FREE 14 Day Subscription to Ancestry.com!

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