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Recently it has become a trend to flip a bottle which is partially filled with water and land it on it's bottom. This video shows the phenomena :https://www.youtube.com/watch?v=2E7rS1q4NbU

What i would like to know is that can we model this phenomena to come up with an equation for a perfect flip of the bottle. If the phenomena does not take a shape in your mind you can ask me to illustrate it much clearly.

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Like the previous craze for flipping a paper/plastic cup, I think it is mostly a matter of practice to flip at the right speed to get the bottle to land on its base. When it does so, the bottle containing 1/3 water has the most stability. But many of the clips show bottles half-filled landing upright, so the amount of water is not crucial.

The larger the number of rotations before landing and the higher aspect ratio of the bottle (height/base), the more difficult it is to land the bottle successfully.

The Institute of Physics explanation points out that when optimally filled and flipped at the right speed the bottle almost stops rotating as it lands. This is compared with a diver who increases his/her moment of inertia in order to open out from the initial tight spin into a slow rotation on reaching the water.

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  • $\begingroup$ Why the down-vote? $\endgroup$ – sammy gerbil Feb 5 '18 at 19:59

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