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Elephant and ducks are walking down to angle level. During their moving place of their specific gravity is changing. Animals are going down swinging: they have only two legs, each with rounded foot. They dont slide down thanks to friction force of the feets and the surface of the angle level. Front leg of each toy is fixed with a body, and rear one is placed on the axis allowing her to rotate with some defined angle. When animal will swing forward standing on the front leg, rear one makes a quick step and joins the first one - now we have quick swing back and then again forward but front leg is now further.
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These toys shows energy conservation rule: their initial potential energy is changing into kinetic energy (relatively small part) and the rest is waisted due to friction. Toys shows also, that uniformly accelerated move, which is expected by engle level is only a model. In real, how was noticed by Newton, in every move occures dissipation or loosing of the energy - where are friction forces, viscosity. In effect movement which in absence of these forces should be accelerated becomes (in stationary conditions) uniformed movement. In similar way there are woodpeckers going down. |