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A metal ball drops onto a metal plate inside a vacuum chamber. The ball visibly bounces but each impact is completely silent.

C1-3-10 Steady State · sound_persistence principle: Vacuum / sound absence (Fluid)
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Per-prompt rubric

Basic standards

Visual presence

  • a metal ball
  • a metal plate
  • a vacuum chamber

Event: a metal ball drops onto a metal plate in a vacuum chamber

Audio presence

  • a metal ball impact

Sound: silence

Key standards

Visual physical commonsense (V-PC)

  • A rigid metal ball is released inside a sealed vacuum chamber and falls onto a metal plate.
  • The ball bounces freely with physically plausible decreasing heights and retains its rigid shape throughout.

Audio physical commonsense (A-PC)

  • The clip contains no audible sound throughout.

Cross-modal physical commonsense (AV-PC)

  • No audio sound coincides with the visible bounces.