Introduction: How to Confuse a Secondary School Student

A rattleback, also known as an "anagyre", "celt", "Celtic stone", "rattlerock", "spin bar", "wobble stone" or "wobblestone" and by the product names "ARK," "Bizzaro Swirls," "RATTLEBACKS," "Space Pet" and "Space Toy," is a semi-ellipsoidal top which will spin on its axis in a preferred direction. But, if spun in the opposite direction, it becomes unstable, "rattles", stops and reverses its spin to the preferred direction. This spin-reversal motion seems, at first sight, to violate the angular-momentum conservation law of physics. Moreover, for most rattlebacks, the motion will happen when the rattleback is spun in one direction, but not when spun in the other. These two peculiarities make the rattleback a physical curiosity that has excited human imagination since prehistorical times.


garrett10 (author)2010-07-27

I bought my rattleback at hobby lobby.

covey12 (author)2009-04-05


strumbot (author)2009-03-20

it wobbles because the axis is formed skew of the center line

Pumpkin$ (author)2008-06-05

not ebay..... probably glencoe science, my teacher has some in a cabinet

Gamer917 (author)Pumpkin$2009-02-24

i have 1 and i made a sort of pull-starter for it so it could spin faster

the_anaconda (author)2008-07-12

what is that black thing in the back ground called

alwinovich (author)the_anaconda2008-08-21

usually called magic/levitating pen it works with repelling magnets in the base and pen (author)2008-05-22

TO EBAY!!!!!!!!!!!!!!!!!!

bob the builder #1 (author)2008-04-04


damasta (author)2008-04-03

nice levitating pen/tops (I don't know) in the background

Hellchild (author)2008-02-10

whats with the scary music?

Impending Boom

oh, that sucks...

GorillazMiko (author)2008-01-25

Awesome.... too much cool stuff.

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