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johnm214 said:
that makes no sense, why is the thing spinning?

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You're a physicist are you not?

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johnm214 said:
die commie, what do you think is going on here? under the table/in the drawer magnetic trickery? I notice they always start the "top" in the same place, and if it gets too far from that location it becomes unstable, which seems to suggest this.

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What could this imply?

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DieCommie said:

My guess is the hand moving the magnets from above is providing the energy. I cant say with any certainty though, the video is horrible as far as explaining goes. Could be a hidden motor. Could be a million things. But one thing it most certainly is not - free energy. The closest your going to get to free energy is charging your cell phone at work.

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see, but how is the hand providing torque? I don't get it

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Ok, if this universe only existed hypothetically, and you consider what I mentioned previously, what could the hypothetical implications mean in this imaginary hypothetical world?

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In fact, magnetic fields can do no work!!

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johnm214 said:iron filing pulled by magnent= work, right

you mean it can't continually do work?  Like the work to move the filing back to where it was originaly is greater than the work that the magnet does on the filing?

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A magnetic field cannot do work at all end of story.  Well, obviously there is some catch because as you mention iron bieng pulled my a magnet is work.


You know cross product and dot product right?  The force exerted by a magnetic field is F = q(v x B), its a cross product.  So the force exerted by a magnetic field is always perpendicular to the velocity of the particle.  Now work is W = F 'dot' d, a dot product.  So work is only done if there is a component of the force parallel to the distance traveled.  But from the magnetic force, the force is completely perpendicular to the distance traveled!  Hence no work is done.

A year or so ago I went to many professors and grad students asking them to explain how a permanent magnet can do work.  Its amazing, but PhD professors and grad students all gave me contradictory and ambiguous reasons.  A common explanation is that the person does the work by moving the magnet, but that is obviously not the case.  Basically in the end I gather its something like this.. the magnetic field cannot do work on a particle but can rotate it so that the electric field can do the work.  Honestly I am still not satisfied and hope to understand it better sometime in the future.  It would be cool if somebody could chime in and explain it better. 

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DieCommie said:
A common explanation is that the person does the work by moving the magnet, but that is obviously not the case.

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