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Nick_Tarleton comments on The Correct Contrarian Cluster - Less Wrong
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The movement of the wind backwards is coupled to the movement of the vehicle forward; but that's the effect of the energy, not the source of the energy.
Gain and loss of energy are frame-dependent; in the road frame, the wind certainly is a source of energy (just as a rocket takes kinetic energy from its reaction mass, when looked at in a frame where it has a greater speed than its exhaust). I'm not sure yet how to think about the vehicle frame.