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Any physics nerds want to explain perpetual motion in this video?

Discussion in 'BlackHat Lounge' started by tony-raymondo, May 17, 2012.

  1. tony-raymondo

    tony-raymondo Junior Member

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    I used to try to build these machines in my garage when I was a kid.

    YouTube is full of them of course.

    This one is based on a 200 year old patent, and, since I just spent 50 bucks on gas, i'm assuming its just an illusion.....

    But why wouldn't this work?

    http://www.youtube.com/watch?v=RkLfpXpO5sQ&t=1m25s

    I'm hoping there is some physics guyz to help?

    Thanks!
     
  2. Four Seasons

    Four Seasons Regular Member

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    Magnetic levitation. There's a train already operating using maglev.
     
  3. bk071

    bk071 Jr. Executive VIP Jr. VIP Premium Member

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    What is physics?
     
  4. tacopalypse

    tacopalypse Executive VIP Jr. VIP Premium Member

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    in order for the ball to turn the wheel, there has to be some sort of constant torque applied to the ball, which it's presumably receiving from the combination of the force of the magnet and the force of gravity. however there's no logical difference between these 2 forces. you simply have one force pulling the ball in one direction, and one force pulling it in the other direction, both of which are acting on the ball's center of gravity. there is no "preferred" direction for the ball to spin in, so it simply wouldn't spin. it would just sit on the side of the wheel motionless once it's found an equilibrium point.

    it might look like the ball is supposed to "pull" the wheel downward because the force of gravity is pointing downward, but then you'd have to ask yourself why the ball isn't "pulling" the wheel towards the direction of the magnet instead.

    most likely, there's just a motor hidden under the table :\
     
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  5. PinguSpy

    PinguSpy Jr. VIP Jr. VIP

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    But I think this is more better..

     
    Last edited by a moderator: May 18, 2016
  6. Leith

    Leith Jr. Executive VIP Jr. VIP Premium Member

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    [​IMG]

    Sorry, PHYSICS is not my best subject.
     
  7. tony-raymondo

    tony-raymondo Junior Member

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    this is a pretty good explanation - thanks!
     
  8. drax

    drax Junior Member

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    Im no physics guy but I was pretty good in school :) What makes you think this is PM apart from the title of the video that is? For a start its only about 2 mins long and there is (probably quite a bit) of energy introduced into the system - the guy turns the spindle by hand! - thats introducing kinetic energy into the system. This energy is then slowly changed (think lost although you cannot 'lose' energy only change its state) through friction, sound, heat, wind resistance, gravity etc. In this case, its probably just a well oiled wheel on good bearings, so low friction, and hence it will decay slowly - but it will decay. I would be more interested to see it going a few hours later. PM - theres no such thing I'm afraid - it violates the fist (or second..I cant remember) law of thermodynamics and a couple of Newtons principles I believe..look it up :)