The simulation shows a 3-dimensional arrangement of particles (elasticly connected to next neighbours) and two external particle. These two particles are moving in opposite direction on a path to collide with two particles of the arrangement.
Due to this symmetric arrangement there will be only transfer of energy during collision but no change in total momentum.
At start all particles are at rest and all springs are at their rest lenght and therefore without any tention. In classical terms this represents a body at a temperature of zero degree Kelvin.
After starting the simulation it can be observed, how the initial kinetic energy of the two external particles is absorbed and transfered to thermal energy, corresponding to an increase in temperatur.
To avoid partial reflexion of momentum, the two external particles should be deleted just afer the first collision

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