
The weak equivalence principle, also known as the universality of free fall or the Galilean equivalence principle can be stated in many ways. The strong EP includes (astronomic) bodies with gravitational binding energy (e.g., 1.74 solar-mass pulsar PSR J1903+0327, 15.3% of whose separated mass is absent as gravitational binding energy). The weak E...
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[geometric] The equivalence principle is treated as one of the corner-stones of gravitation theory. However, there exist its different formulations. In particular, one separates weakest, weak, middle-strong and strong equivalence principles. All of them are based on the empirical equality of inertial mass, gravitational active and passive c...
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http://en.wikipedia.org/wiki/Equivalence_principle_(geometric)

fundamental law of physics that states that gravitational and inertial forces are of a similar nature and often indistinguishable. In the Newtonian ... [4 related articles]
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http://www.britannica.com/eb/a-z/e/39

The complete equality of gravitational and inertial mass, gravity and acceleration, and the identification of freefalling frames with inertial frames. The equivalence principle is the fundamental basis for the general theory of relativity. The weak (or Newtonian) equivalence principle is the princi...
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Constant acceleration is completely equivalent to a uniform gravitational field.
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(in relativity) the principle that, in any small region of space-time, the effects of a gravitational field are indistinguishable from those of an appropriate acceleration of the frame of reference. Also called
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https://www.infoplease.com/dictionary/equivalence-principle
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