In the air, the velocity and angular momentum that causes a force against gravity is lift. How can a rotating cylinder make lift with angular momentum?
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1Look up the Magnus Effect. Plenty of questions here about it as well: http://physics.stackexchange.com/q/171863/ for example – tpg2114 Apr 07 '15 at 15:42
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Ok , I know what is Magnus effect but if you can , explain this question . – Michaele Apr 07 '15 at 15:46
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If you really knew how the Magnus effect worked, you would already know the answer your question. I don't have time to answer it, I was merely providing you with information on where/what to look for. And just a hint, it's due to viscosity -- turns out almost everything in fluids works back to viscosity. – tpg2114 Apr 07 '15 at 15:49
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1possible duplicate of By what mechanism is lift produced on a rotating cylinder in an inviscid flow? – John Rennie Apr 07 '15 at 17:59
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1pictures say more than words: https://www.youtube.com/watch?v=23f1jvGUWJs – image357 Apr 07 '15 at 19:20