- Tippe top
A tippe top is a kind of
top . When a tippe top is spun at a highangular velocity , its handle slowly tilts downwards more and more until it lifts the body of thetop off the ground and points perfectly downward. As the top's spinning rate slows, it loses stability and eventually topples over. Explaining this phenomena requires use of very sophisticatedphysics . At first glance the top's inversion could mistakenly be found to be a situation where the object gainsenergy . This is because the inversion of the top raises the object's center of mass, which means thepotential energy has increased. What causes the inversion (and the increase in potential energy) is atorque due to slidingfriction , which also decreases thekinetic energy of the top, so the total energy does not actually increase.Further reading
*cite journal |author=Bou-Rabee, Nawaf; Jerrold E. Marsden; and Louis A. Romero |title=Dissipation-Induced Heteroclinic Orbits in Tippe Tops |journal=SIAM Review |volume=50 |year=2008 |url=http://authors.library.caltech.edu/10958/1/BOUsiamr08.pdf |doi=10.1137/080716177
*cite journal |author=Glad, S. Torkel; Daniel Petersson; and Stefan Rauch-Wojciechowski |title=Phase Space of Rolling Solutions of the Tippe Top |journal=Symmetry, Integrability and Geometry: Methods and Applications (SIGMA) |volume=3 |year=2007 |url=http://www.emis.de/journals/SIGMA/2007/041/ |doi=10.3842/SIGMA.2007.041
External links
* [http://www.fysikbasen.dk/English.php?page=Vis&id=79 FYSIKbasen.dk]
* [http://scienceworld.wolfram.com/physics/TippeTop.html Eric Weisstein's World of Physics]Patent
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