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The Universal ForceGravity - Creator of Worlds$
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Louis Girifalco

Print publication date: 2007

Print ISBN-13: 9780199228966

Published to Oxford Scholarship Online: January 2008

DOI: 10.1093/acprof:oso/9780199228966.001.0001

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Time warps and bent space

Time warps and bent space

(p.195) 15 Time warps and bent space
The Universal Force

Louis A. Girifalco

Oxford University Press

General relativity is the extension of the ideas of relativity to accelerated motion. It starts with the premise that the laws of physics should be the same for all, whatever the state of motion. It then builds on the observation that an elevator falling in a gravitational field experiences no forces, and that a gravitational field is fully equivalent to an elevator being accelerated upwards. From these common-place foundations, Einstein found that mass causes a curvature in space-time and that gravity is the result of bodies moving along this curvature. Gravitational forces are reduced to the geometry of space-time.

Keywords:   general relativity, space curvature, gravity as geometry, accelerated motion, state of motion, gravitational field, mass

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