Why does this toy ball spin like this?

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paul

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Why does this toy ball spin like this?
« on: 11/05/2010 16:30:02 »
paul asked the Naked Scientists:
   
My 4 year old daughter has plastic bowling ball set.

If I spin the plastic bowling ball in one spot with the three holes on the top, it will spin and as it is ready to stop, the three holes 'magically' move to the bottom and always seem to end up at the bottom with every spin.

Why is that?

What do you think?
« Last Edit: 11/05/2010 16:30:02 by _system »

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Offline Bored chemist

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Why does this toy ball spin like this?
« Reply #1 on: 11/05/2010 19:35:52 »
I think it might be something like this
http://authors.library.caltech.edu/10958/1/BOUsiamr08.pdf

But please don't ask me to explain it.
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Offline LeeE

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Why does this toy ball spin like this?
« Reply #2 on: 11/05/2010 20:07:32 »
Is the plastic bowling ball hollow and are the finger holes sealed?  If it is then there will actually be more mass where the finger holes are and this would cause the ball to want to settle with the finger holes downwards.
...And its claws are as big as cups, and for some reason it's got a tremendous fear of stamps! And Mrs Doyle was telling me it's got magnets on its tail, so if you're made out of metal it can attach itself to you! And instead of a mouth it's got four arses!