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Recently I've learned about Janibekov effect, which looks like magic. What's the explanation behind it?

I remeber from school that if no force is applied then object should keep still or continue going as it did, what is the force in this case?

ren
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    I think this question has answers: http://physics.stackexchange.com/q/17504/ – Hritik Narayan May 15 '15 at 12:19
  • I was looking for intuitive no-math answer. I guess there is no such one to this problem. – ren May 15 '15 at 13:14
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    Yeah, not that I know of. I happened to have asked a similar question ages back, I got only mathematical answers, but they do make loads of sense once you look into it! – Hritik Narayan May 15 '15 at 13:38
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    This seems to be a clear answer in plain English, but you have to be geometrically aware (scroll down to 1st answer, by Terry Tao): http://mathoverflow.net/q/81960/. Basically, the instability is triggered by tiny inevitable perturbations in centrifugal force. – Ernie May 15 '15 at 14:36

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