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Results tagged with gravity
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user 24362
Gravity is an attractive force that affects and is affected by all mass and - in general relativity - energy, pressure, and stress. Prefer newtonian-gravity or general-relativity if sensible.
2
votes
How accurately has general relativity's prediction of gravitational redshift been measured?
Fifty years, ago, the Pound-Rebka experiment demonstrated gravitational blue shift on Earth in a tower at Harvard, to an accuracy of 10%.
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Why is there a need for a strong field versus weak field model? is the weak field just a sim...
Basically, it is the "high speed" part of GR the "explodes" the mathematics beyond simple analysis; the "high gravity" part is very accessible by comparison. …
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-1
votes
What motivated Einstein to formulate general relativity?
Einstein came up with General Relativity because he recognized that Special Relativity was not a good description of the universe (he couldn't make gravitation work sensibly within it).
He came up wit …
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1
vote
Mental model of general relativity
Unfortunately that "model" is complete and utter rubbish. You cannot learn anything from it, so please do not try!
Nobody who understands General Relativity uses it. It does not represent any equati …
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4
votes
Gravity is not a force - how does "accelerating up" work for the entire earth?
Imagine a really deep hole in the ground (obviously this can be anywhere!). If you step into it you fall inwards (geodesic motion). If you activate your rocket pack you can return to ground level. …
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1
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Why and when can the Earth be considered an inertial reference frame?
Motion near the Earth is basically inertial if an object is not being "pushed" by anything! If you throw a stone it is in inertial motion (apart from air resistance) until it hits the ground.
Motion …
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