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A tuning fork is struck and rings faintly in the air. Then it is pressed onto a sandbag, and the vibrations and sound stop almost instantly.

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Per-prompt rubric

Basic standards

Visual presence

  • a tuning fork
  • a sandbag

Event: a tuning fork is pressed onto a sandbag

Audio presence

  • a tuning fork

Sound: a tuning fork ring

Key standards

Visual physical commonsense (V-PC)

  • A canonical U-tine tuning fork is struck and held in the air during the clip.
  • The vibrating fork is then pressed firmly onto a sand-filled deformable sandbag.

Audio physical commonsense (A-PC)

  • A faint ring from the airborne tuning fork is audible before the sandbag contact.
  • The ring decays to silence almost instantly once the fork contacts the sandbag, with no residual sustained tone.

Cross-modal physical commonsense (AV-PC)

  • The ring onset in the audio aligns in time with the visible strike of the tuning fork.
  • The abrupt end of the ring coincides in time with the visible moment the fork contacts the sandbag.