ALL SCI-FI

[bulldogtrekker]

Build an Incredibly Simple Electric Toy Car With Just a Battery and Two Magnets



youtube video
https://www.youtube.com/watch?v=oPzJr1jjHnQ

If you can find a pair of round magnets and a AA battery that isn't already dead, you can build this incredibly simple electric vehicle that's better than watching TV.

You might be wondering how this contraption can roll around all on its own without an electric motor but it's there; it's just invisible. This simple assembly is what's known as a homopolar motor which places a conductor inside a magnetic field to generate forces perpendicular to that field.

Did you notice that all the footage of this simple electric car was shot with it working on aluminum foil? That wasn't laid down just to make the video a little more flashy. The foil road actually serves as a conductor between the two ends of the battery. And when it ends up mixing with the magnetic field generated by the two magnet wheels, there's enough force to push the entire thing along at an impressive clip.....

LINK:
http://toyland.gizmodo.com/build-an-incredibly-simple-electric-car-with-just-a-bat-1746672041

[Bud Brewster]

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I guess that gizmo works a little like these things, which haven't been made since the 1970s. I have one in my living room.



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Is there no man on Earth who has the wisdom and innocence of a child?
~ The Space Children (1958)