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a system with internal structure changes the
anlaysis
(W-E theorem no longer applies).
... breaking the skater into
arm+torso makes sense. But for the arm to push on the
torso, the wall must push on the hand/arm b/c the arm
can't accelerate the torso by pushing against the air.
And then how does the wall "know" to push on the arm
if the wall doesn't deform?