Centrifugal force and gravity..

Discussion in 'Science and Technology' started by Trinity Gingerbread, Jul 8, 2020.

  1. Trinity Gingerbread

    Trinity Gingerbread Time is the thief of life Premium Member

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    Would a spinning component in the middle of a space station create gravity for people around the component in an adjoining room for example?

    Say you had two rooms and both normally are in zero g but the moment the spinning part starts in between the two rooms would that introduce any kind of gravity?

    Asking because that's the very thing they did in the movie Valerian and I don't think at all that would work but being a movie they probably had some technobabble answer.
     
  2. Asbo Zaprudder

    Asbo Zaprudder Vice Admiral Admiral

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    No, except that the station, which I assume is much more massive and extended than the spinning component, might tend to rotate slowly in the opposite direction to conserve angular momentum unless station-keeping gyros or RCS are used to counteract the motion. This does depend on the mechanism used to set the spinning component in motion though.

    For example, a tip-rotor helicopter whose rotors are self-powered by tip jets or rockets does not feel this torque.

    https://en.wikipedia.org/wiki/Tip_jet
     
  3. Trinity Gingerbread

    Trinity Gingerbread Time is the thief of life Premium Member

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    Ah.... OK I get that.

    Just watching this silly movie and the intro to the movie they show the station being built and there's one part where a small ship docks with two sort of flanges on the outside and they start spinning, and once they spin everyone suddenly can walk without floating. I'll see if I can find the clip. It's a silly fun movie but that part got me wondering how that would even work since one force would have a reaction to it.

    Scene takes place in 2030 you see the spinning ship dock and spin and suddenly they have gravity

     
    Last edited: Jul 8, 2020
  4. Asbo Zaprudder

    Asbo Zaprudder Vice Admiral Admiral

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    Video not available in my country even using VPN to change my region to USA, Canada,... Do you know the approximate position during the movie? I have it on Blu-ray.

    ETA: Found the sequence 2 minutes in - 2031, Gravity System Engaged - it's pure fantasy given what we currently know.
     
    Last edited: Jul 8, 2020
  5. Trinity Gingerbread

    Trinity Gingerbread Time is the thief of life Premium Member

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    Oh I know that. Just it was amusing to see that that's how they did it. A spinning thing exerting force outside its immediate area.
     
  6. XCV330

    XCV330 Premium Member

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    I think they just put it in to look good. Sci fi movies come up with gravity methods to make production easier. Expanse tries harder than most to leave some realism.

    Maybe the spinning devices were trying to set up a diamagnetic field to generate a kind of artificial gravity. That could sort of work but would require generating a tremendous magnetic field, sort of the opposite of levitating the frog and instead pushing it to one axis.

    [​IMG]

    whether human beings could live in that kind of field, or how you would actually get anything done is another matter.
     
  7. Trinity Gingerbread

    Trinity Gingerbread Time is the thief of life Premium Member

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    I think the Expanse definitely is the most realistic TV scifi of recent times.
     
  8. XCV330

    XCV330 Premium Member

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    Alex is my most favorite space pilot of all time.
     
  9. Timelord Victorious

    Timelord Victorious Vice Admiral Admiral

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    Shame the actor felt, he had to screw it up, though.
     
  10. XCV330

    XCV330 Premium Member

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    Crap. Had no idea
     
  11. Asbo Zaprudder

    Asbo Zaprudder Vice Admiral Admiral

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    Roles can be recast - I hope it doesn't sink the series.
     
  12. Trinity Gingerbread

    Trinity Gingerbread Time is the thief of life Premium Member

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    What? Why would one role sink the show?
     
  13. Asbo Zaprudder

    Asbo Zaprudder Vice Admiral Admiral

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    It shouldn't but apparently some people don't like it if one of the main actors in a show has to be recast. Batwoman is another example. Even The Expanse is just another TV show. Doctor Who got over this problem in a rather clever way back in the 60s, of course...
     
  14. XCV330

    XCV330 Premium Member

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    Cas Anvar was just a very good actor who has turned what might otherwise be a bland role into something special. Anyway, filming from what I've heard already wrapped up and season 5 will come out in Feb
     
  15. Asbo Zaprudder

    Asbo Zaprudder Vice Admiral Admiral

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    The way the books are written and depending on whether season 5 makes it to the end of Babylon's Ashes, there would be an explicable reason for recasting or dropping the character altogether if season 6 moves straight on to Persepolis Rising. No spoilers...