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Adding local short description: "Theoretical physics term", overriding Wikidata description "frame of reference localized to a specific region of spacetime" |
→Equivalence principle: Add 1st book citation, found with a combination of the Spanish language article and my brown searches. #JUN25 Tags: Mobile edit Mobile web edit |
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{{main|Equivalence principle}}
When constructing his [[general theory of relativity]], [[Albert Einstein|Einstein]] made the following observation: a freely falling object in a gravitational field will not be able to detect the existence of the field by making local measurements ("a falling man feels no gravity").<ref name=Zee>{{cite book|url=https://books.google.com/books?id=B7OdsjBg5WcC&pg=PA17&dq=a+falling+man+feels+no+gravity&hl=en&newbks=1&newbks_redir=|pages=5-7, 10-17, 21-27, 230-242|title=Einstein's Universe: Gravity at Work and Play|first=A. |last=Zee|publisher=Oxford University Press|year=2001|access-date=June 18, 2025}}</ref> Einstein was then able to complete his general theory by arguing that the physics of curved spacetime must reduce over small regions to the physics of simple inertial mechanics (in this case [[special relativity]]) for small
==Laboratory frame{{anchor|Laboratory|Laboratory frame}}==
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