Maxwell's wheel, on the rack

MACHINE TRANSLATION (not authorised yet)

Classical teaching aid presenting the phenomenon of energy conservation and its transformation (here: potential to kinetic energy). A wheel with an axis serving as a handle is hung on a tripod (two points); the experience consists in rolling the strings on the axes and pulling the wheel upwards and then letting it go free - potential energy is converted into kinetic energy and the wheel goes down, where the reverse is done: kinetic energy into potential and the wheel moves back upwards. The whole process continues until all the energy is consumed by the friction forces (otherwise it would be a kind of perpetual motion). Demonstration aid - wheel diameter: min. 9 cm.