why when you make a circle over your head with a cup of wather, it doesn't comes out of the glass??

Answer:
It's the centripetal force that pushes the water towards the centre of the circle. If you go fast enough the cetripetal force will be greater than gravity and your water won't spill.F(c) = m V^2/r and F(g) = mgTo stop the water falling out of the cup V^2/R %26gt;G
(Where G =9.81m/s).P.S. This would have been better in the Physics section.

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I think it is called centrifical force. There is enough force pushing up on the water to overcome gravity and keep the water in the glass.

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