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The Spinning Top that flips itself over when it is spun!
This is a fascinating spinning top with an interesting behaviour. The 'Spinning Top' inverts itself when spinning at sufficient speed. It does this because its centre of mass does not coincide with the geometrical centre of sphere. This means that when spinning the bulbous top slides over the surface on which it is spinning and this friction and motion causes enough force to 'drive' the spinning top up and over until it is spinning on the stalk. Once on the stalk there are far less sliding forces and the top can now spin stably until it no longer has enough energy to sustain its speed and spin. (Chinese spinning top).