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Published on Sep 10, 2010
Same code and parameters as video 1, except here three of the four edges are now free boundaries. Without aerodynamic drag forces or torsional dissipation at the nodes, any bulk motion consisting purely of rotation will continue indefinitely. This is why the flag on the moon appeared to wave as though in wind, without air resistance only the internal friction in the material could dissipate kinetic energy imparted to it during handling.