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I Hydraulic engine

  1. Sep 13, 2016 #1
    What will happen with metal ball in the below picture? it will spin? if yes, when it will stop and why? I am not very faimiliar with physics, but I am sure that ball must spin :D

    http://www.cagof.com/Untitled.png [Broken]
    Last edited by a moderator: May 8, 2017
  2. jcsd
  3. Sep 13, 2016 #2


    Staff: Mentor

    If the ball, air, and oil are all initially stationary then it will not suddenly start to spin.

    Please be aware of the forum rules prohibiting discussion of perpetual motion machines.
  4. Sep 13, 2016 #3
    air will be pressed through valve
  5. Sep 13, 2016 #4


    Staff: Mentor

    Then it could start spinning. It would stop spinning when viscous drag forces stop it.
  6. Sep 13, 2016 #5


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    The container appears sealed at the bottom so the pressure in the oil is likely to be the same/similar to that of the air - so why would the air go past the ball?
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