Physics: Magnetism 20: The Simplest Motor: How to Make It and How It Works
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- เผยแพร่เมื่อ 6 ก.พ. 2016
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I made one of these "motors" and it tickles me every time I make the screw/nail spin. ..... However ..... I noticed something unexpected. I found that I can make it spin WITHOUT TOUCHING the neodymium magnet at all. If the screw/nail is rocking a little bit back and forth like a conical pendulum, it will begin to spin and remain spinning as long as the screw/nail keeps moving back and forth. I suspect this is due to or somehow related to Faraday's Law that ANY change [ motion, frequency, amplitude ] in the B Field will induce current (emf => I ) .... but I am not sure that is a solid explanation. ....... Anyway thank you for the delightful video and the elegance of this "motor".
I think it may be inertia: the nail + magnet are spinning and will continue to spin for a while until they lose all their kinetic energy to friction and air resistance even after the current is cut off.
While they are swinging a little like a conical pendulum, the occasional contact between the wire and magnet provide current and therefore magnetic force to give the spinning nail + magnet occasional torque to pick their spinning back up.
Yau-Jong Twu hi may i know the why the angular acceleration of sphere rolling on horizontal plane is zero
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Please move the mic a little further away from where it is. I think its a bit too close
Thank you. I will keep that in mind.
i didn't understand .
+Parameswar Ghosal Perhaps taking a look at the first 4 magnetism lesson can help. You can find them at: sites.google.com/site/twuphysicslessons/home/magnetism
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