Coupled pendulums 
In addition to the movement simulation table, there is the energy bar, which, in this case, also gives an indication of the energy of the spring (compressed or stretched): the sum of the kinetic and potential energies of the two pendulums is no longer constant; it now depends on the degree of compression or extension of the spring. The (almost) total alternating transfer of kinetic energy from one pendulum to the other, characteristic of this type of pendulum, is clearly visible from different points of view: through the simulation itself, through the energy (bar) graph, through the two movement graphs and by the alternation with which the orbits appear in almost perpendicular directions, in the space of configurations (torus).
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