Timeline for Why does rotation simulate gravity if motion is relative?
Current License: CC BY-SA 3.0
23 events
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| Jan 6, 2015 at 22:09 | comment | added | honeste_vivere | I was going to ask a similar question. Namely, why is acceleration indistinguishable from gravity? For instance, if you are inside a closed box experiencing (or measuring acceleration), you do not know if the box is in a gravitational field, being accelerated by a rocket, or being forced along a circular path. | |
| Dec 3, 2014 at 9:24 | answer | added | Guill | timeline score: 0 | |
| Nov 28, 2014 at 14:25 | history | edited | Qmechanic♦ | CC BY-SA 3.0 |
added 63 characters in body; edited tags
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| Nov 28, 2014 at 14:15 | history | protected | Qmechanic♦ | ||
| Nov 27, 2014 at 21:04 | comment | added | Renae Lider | A rotating frame is an accelerating frame or a non inertial frame, hence there is a force involved. | |
| Nov 27, 2014 at 20:29 | comment | added | njzk2 |
So we know that space station 2 is rotating and space station 1 is not because of the sensation of gravity we feel in station 2. and also because since station 1 is not orbiting around station 2, there are being pulled toward one another.
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| Nov 27, 2014 at 5:21 | history | edited | David Z | CC BY-SA 3.0 |
improve title and tags
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| Nov 27, 2014 at 3:09 | history | tweeted | twitter.com/#!/StackPhysics/status/537805472385232897 | ||
| Nov 27, 2014 at 1:08 | comment | added | user10851 | Some historical background: Einstein was inspired by Mach's philosophy (which is not to say general relativity is necessarily 100% Machian), which in turn mirrored much of what Leibniz believed. Newton and Leibniz vehemently disagreed on a number of things (not just calculus), one of which is whether a notion of space exists independent of the matter in the universe. To counter Leibniz's "everything's relative" stance, Newton put forth his bucket thought experiment, which, as far as I know, none of his contemporaries had a good response to. | |
| Nov 27, 2014 at 0:15 | comment | added | garyp | Here's a simpler version of this. If there is one spaceship in the universe, and you say it is rotating, what is it rotating with respect to? Einstein himself had a problem with that question. I'm no expert here, but I think he deferred to Mach's Principle, which roughly says that the rotation can be defined with respect to the average position of all the mass in the universe. As I understand things, General Relativity provides a mechanism for this. Experts will have to explain it to us. | |
| Nov 26, 2014 at 23:48 | vote | accept | Jeremy Olson | ||
| Dec 5, 2014 at 3:07 | |||||
| Nov 26, 2014 at 22:59 | comment | added | balu | I'd like to stress one of the references being burried in the thread that user122262 linked to: The OP's question is more or less directly related to Mach's Principle. | |
| Nov 26, 2014 at 22:13 | answer | added | adipy | timeline score: 11 | |
| Nov 26, 2014 at 22:03 | answer | added | eshaya | timeline score: 12 | |
| Nov 26, 2014 at 22:02 | comment | added | user12262 | Jeremy Olson: "the sensation of gravity we feel" -- In the theory of relativity the measurements of geometric relations (such as, whether participants under consideration are at rest to each other, or instead merely rigid to each other) is not based on their possible "feelings", but on the judgement of coincidence (or else: sequence) of observations by each participant. Of course this approach does not deny the possibility or reality of such feelings; but it establishes a reference for measuring/comparing/distinguishing the "acuteness and trueness of feelings" of each participant. | |
| Nov 26, 2014 at 22:01 | comment | added | user12262 | Jeremy Olson: "how can you say it is rotating in the first place?" -- Closely related ("the opposite question"): "What determines which frames are inertial frames?" (PSE/q/3193). "according to Einstein, I don't think there is a fixed at rest?" -- In the theory of relativity there are definitive methods for determining whether several participants are at rest to each other, or (only) rigid to the other (e.g.: rotating), or (even) moving wrt. each other. | |
| Nov 26, 2014 at 22:00 | answer | added | Jan Hudec | timeline score: 33 | |
| Nov 26, 2014 at 21:49 | answer | added | Señor O | timeline score: 3 | |
| Nov 26, 2014 at 20:47 | answer | added | Zo the Relativist | timeline score: 5 | |
| Nov 26, 2014 at 20:42 | history | edited | Kyle Kanos | CC BY-SA 3.0 |
remove irrelevant words, fixed some formatting for easier reading
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| Nov 26, 2014 at 20:40 | answer | added | Peter | timeline score: 3 | |
| Nov 26, 2014 at 20:33 | review | First posts | |||
| Nov 26, 2014 at 20:42 | |||||
| Nov 26, 2014 at 20:29 | history | asked | Jeremy Olson | CC BY-SA 3.0 |