Thermodynamical asymmetries in whirling, jumping and walking
  We analyze, from the thermodynamical point of view, mechanical systems in which there is production of mechanical energy due to an internal source of energy, and compare that analysis with the similar one for the "symmetric" motion which occurs with energy dissipation. The analysis of the energetic asymmetries is instructive to put in evidence the role of thermodynamics even in the discussion of mechanical aspects. We illustrate the discussion with the well known example of a person on a rotating platform outstretching and contracting his/her arms, and also with other common situations such as jumping and walking. 
Julio G\"u\'emez and Manuel Fiolhais
physics.class-ph