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Which analogy describes the stretching term?

  • A.A ball rolling down a slope under gravity, gaining speed as it loses height along the descent
  • B.A pendulum swinging
  • C.A wheel spinning down under friction until it eventually comes to rest against the surface below
  • D.A skater pulling in their arms

Answer: D

Conservation of angular momentum means that reducing the radius of a rotating body increases its rate of spin, and a converging air column behaves in exactly the same way. The analogy is not merely illustrative: both cases follow from the same conservation principle. The other analogies describe energy conversion and dissipation, which are different physical processes altogether.

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