Timeline for Would the world end if friction disappeared?
Current License: CC BY-SA 3.0
17 events
| when toggle format | what | by | license | comment | |
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| Sep 5, 2016 at 12:20 | vote | accept | Skye | ||
| Sep 4, 2016 at 16:25 | history | edited | Nobody | CC BY-SA 3.0 |
Extended a little, fixed some things
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| Sep 4, 2016 at 15:57 | comment | added | Xplodotron | @Nobody - Nice try, but you're just saying that to pass the Turing test. | |
| Sep 4, 2016 at 15:50 | comment | added | Nobody | @Xplodotron Thanks, but I mean I'm a Swiss human and have been learning English for around 8 years. :-) | |
| Sep 4, 2016 at 15:45 | comment | added | Nobody | @Xplodotron I don't know much about superfluids and the impression I got is that other people don't know much more either. Because I don't know how they work, I couldn't tell what switching from a particle to a smooth physical model would change about them. Likely answer: Everything. When developing a fictional physical model for a story you would likely omit them because they don't occur in everyday live. But this makes me think that maybe, just maybe, you could plausibly turn off fluid drag with a reasoning like this. It wouldn't be superfluids but inspired by them. | |
| Sep 4, 2016 at 15:38 | comment | added | Xplodotron | @Nobody Makes sense that those air molecules get shoved out of the way. And indeed friction does work on a nanoscale and at molecular level. Also, when you say you are not a native English speaker do you mean that you are an artificial intelligence? 'Cos your English is perfect. | |
| Sep 4, 2016 at 15:34 | comment | added | Nobody | @Xplodotron Honestly I didn't consider it, I was just going for a selection of effects making it clear how difficult the problem is. "friction on a molecular" level was a term I invented because I'm not a native English speaker. Is it misleading? I meant friction effects caused by surface irregularities the size of molecules (as wide a range as that is). On overcoming fluid drag: Should be impossible. Reasoning: First there is a mass of fluid occupying space. Then the vehicle occupies that space. The fluid was accelerated or it would still be there. This takes energy which can't be recovered. | |
| Sep 4, 2016 at 15:15 | comment | added | Xplodotron | @Nobody - When you mentioned "friction on a molecular" level I thought superfluidity. Would you consider superfluidity as a "friction like" effect? So far the only superfluid is super-cooled He, but I think the loss of friction would make all liquids superfluids. Oddly, eddys in superfluids go on for a really really long time, which from my limited knowledge suggests to me that the fluid drag caused by inertia is overcome. Please school me. | |
| Sep 4, 2016 at 15:03 | history | edited | Nobody | CC BY-SA 3.0 |
Fixed typo.
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| Sep 4, 2016 at 14:37 | comment | added | Nobody | @celtschk I concur the phrase is a little simplistic, but the point remains. Calling fluid drag friction is at least misleading. While those four words may be debatable, their very precise meaning is not central to my answer and especially with the revised context clear enough. I'm not going to change them. | |
| Sep 4, 2016 at 14:27 | comment | added | celtschk | "This is not true" is not the same as "this is not included in the specific model of friction I'm describing above". You are accusing everyone who makes that claim of telling things that are not true. | |
| Sep 4, 2016 at 14:16 | history | edited | Nobody | CC BY-SA 3.0 |
Protected from nitpicking.
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| Sep 4, 2016 at 14:10 | comment | added | Nobody | @celtschk I chose a definition of friction for my answer which is common enough among physicists and applied it consistently. What I mean with it is clear from the context; I explained it at the beginning of my answer. | |
| Sep 4, 2016 at 13:57 | comment | added | celtschk | "You probably know that fast moving objects in an atmosphere, like cars, bikes, trains, planes spend most of their power overcoming "friction", once they are at speed (so are not accelerating and not moving very slowly). This is not true." — Of course it is true. It is one of the effects that are subsumed under the name "friction". | |
| Sep 4, 2016 at 13:40 | history | edited | Nobody | CC BY-SA 3.0 |
Corrected little error.
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| Sep 4, 2016 at 13:34 | history | edited | Nobody | CC BY-SA 3.0 |
Structured better
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| Sep 4, 2016 at 13:25 | history | answered | Nobody | CC BY-SA 3.0 |