Timeline for What prevents this rotational perpetuum mobile from working? [closed]
Current License: CC BY-SA 3.0
29 events
| when toggle format | what | by | license | comment | |
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| Nov 12, 2014 at 10:54 | comment | added | user65081 | I disagree, OP was trying to visualize how energy is conserved because his intuition indicated him it would increase instead of being conserved. | |
| Nov 12, 2014 at 10:49 | vote | accept | Sx7 | ||
| Nov 12, 2014 at 9:05 | history | closed |
Kyle Kanos JamalS ACuriousMind♦ Brandon Enright Neuneck |
Not suitable for this site | |
| Nov 11, 2014 at 21:18 | comment | added | Kyle Kanos | I can initialize my simulations of supernovae with an initial energy of $10^{38}$ J or $10^{50}$ J (rather than the canonical $10^{44}$ J), but that does not make it physically realistic. For instance, friction is not a magical button that can be triggered on or off. | |
| Nov 11, 2014 at 21:15 | history | edited | Sx7 | CC BY-SA 3.0 |
I added calculations
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| Nov 11, 2014 at 20:56 | comment | added | Sx7 | I rotate all gears without friction. At t=0 I set friction ON and I count all energies. I study ONLY the transcient analysis. And don't say this device can't turn I tested on a simulator ! it turns, not an hour, but enough for it's possible to study the sum of energy during one second. | |
| Nov 11, 2014 at 20:23 | review | Close votes | |||
| Nov 12, 2014 at 9:05 | |||||
| Nov 11, 2014 at 20:05 | history | edited | Sx7 | CC BY-SA 3.0 |
I added image for case 3
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| Nov 11, 2014 at 19:13 | history | edited | Sx7 | CC BY-SA 3.0 |
I added an image
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| Nov 11, 2014 at 19:08 | history | edited | Sx7 | CC BY-SA 3.0 |
I added an image
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| Nov 11, 2014 at 18:57 | history | edited | Sx7 | CC BY-SA 3.0 |
I added an image
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| Nov 11, 2014 at 18:21 | history | edited | Sx7 | CC BY-SA 3.0 |
I changed image
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| Nov 11, 2014 at 17:40 | comment | added | Mike Dunlavey | The two red wheels at the bottom are turning against each other. If they have friction, them all the kinetic energy turns into heat energy. If they are gears, then the wheels can't even start. $w_1$ has nothing to do with it. | |
| Nov 11, 2014 at 16:58 | comment | added | Sx7 | I count friction too. Why it can't turn ? | |
| Nov 11, 2014 at 16:57 | comment | added | Kyle Kanos | Also, I would say that the energy would not be constant because you're losing it to friction (a non-conservative force). | |
| Nov 11, 2014 at 16:57 | comment | added | Kyle Kanos | I would say, that no it won't turn at all. At least not the way you want it to turn. | |
| Nov 11, 2014 at 16:55 | comment | added | Sx7 | I'm interesting about the transcient analysis, for a little while the system turn, no ? and I would like to understand how energy can be constant in this duration. | |
| Nov 11, 2014 at 16:53 | history | edited | Sx7 | CC BY-SA 3.0 |
I added info for users
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| Nov 11, 2014 at 16:48 | comment | added | Kyle Kanos | Without a driving force to force them to move oppositely, those two red gears would stop, which means none of the gears turn. | |
| Nov 11, 2014 at 16:47 | answer | added | user65081 | timeline score: 1 | |
| Nov 11, 2014 at 16:47 | comment | added | Sx7 | @Kyle Kanos: one gear turn clockwise next counterclockwise, I know 2 red gears can't turn like gears but I don't want that, I want only friction. It's possible to imagine in this part not a gear but a part of disk and study the system during a few time. | |
| Nov 11, 2014 at 16:29 | history | edited | Sx7 | CC BY-SA 3.0 |
I added an image for explain at Jan
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| Nov 11, 2014 at 16:23 | comment | added | Sx7 | I added an image, you can understand like that ? @Jan: I would like to understand the transcient analysis, from start to tx, with tx small | |
| Nov 11, 2014 at 16:22 | history | edited | Sx7 | CC BY-SA 3.0 |
I added an image for explain at Jan
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| Nov 11, 2014 at 16:17 | comment | added | Kyle Kanos | I think you need a strong review on how touching gears rotate. The animation at the top of the Wikipedia page on Gears gives an excellent reason why your diagram seems to be inaccurate. | |
| Nov 11, 2014 at 16:10 | comment | added | John Dvorak | How exactly are the gears kept in motion? If they are driven by an external force, said force will provide energy into the system. If not, they will stop moving soon as their kinetic energy turns into heat. | |
| Nov 11, 2014 at 16:10 | history | edited | Qmechanic♦ | CC BY-SA 3.0 |
edited tags; edited title
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| Nov 11, 2014 at 16:07 | comment | added | John Dvorak | "I guess no friction elsewhere than red/red disks surface." - if you have enough frictionless surfaces, it's easy to have a system that doesn't lose energy. It can't generate any, though, ever. | |
| Nov 11, 2014 at 16:06 | history | asked | Sx7 | CC BY-SA 3.0 |