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A metal bowl rings brightly when struck empty. After filling it partway with sand, it rings noticeably lower.

C2-1-22 Event Transition · source_body principle: Mass Loading -> Pitch (Mechanics)
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Per-prompt rubric

Basic standards

Visual presence

  • a metal bowl
  • sand

Event: a metal bowl is struck

Audio presence

  • a metal bowl

Sound: a metal bowl ring

Key standards

Visual physical commonsense (V-PC)

  • The metal bowl is visibly struck once when empty and struck again after sand is poured partway in, with each strike contacting the bowl's wall or body rather than the sand pile inside.

Audio physical commonsense (A-PC)

  • The second ring with sand added is noticeably lower and more damped than the first ring on the empty bowl.
  • The strike sound has the characteristic bright metallic ring of a struck metal bowl.

Cross-modal physical commonsense (AV-PC)

  • Each ring onset aligns in time with a visible strike of the bowl.
  • The lower and more damped ring corresponds to the bowl with sand.
  • The brighter ring corresponds to the empty bowl.