Discrepant Event-The Rattleback

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.

Category:

Education

Tags:

• Chemistry
• Physics
• Science
• Experiments
• Demonstrations
• Demo
• Top
• Spinning
• Discrepant
• Events

[KJVideoTours]

Would it spin Clockwise in Australia?

[Failcamkid27]

You can buy them for pretty cheap

[MyHowtoman]

I want to make one

[izzysgun]

i wanted to know more about that black object perpetually spinning int he background. did you make it (if so can you give the instructions in how to make it) or did you buy it(where) it seeps pretty fun. my guess its that its being powered by magnets and some electricity as i did some kind of similar experiment back in high school. :D

[Matyme]

Where did you get the bird in the back? I used to have one when I was a kid, I would love to get another one.