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A tuning fork is struck and held in the air, humming faintly. Its base is then pressed firmly against a wooden tabletop and the hum suddenly fills the room much louder.

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Per-prompt rubric

Basic standards

Visual presence

  • a tuning fork
  • a wooden tabletop

Event: a tuning fork contacts a wooden tabletop

Audio presence

  • a tuning fork
  • a wooden tabletop

Sound: a tuning fork hum

Key standards

Visual physical commonsense (V-PC)

  • A canonical U-tine tuning fork is struck and held in the air during the clip while keeping its rigid metal shape.
  • The base of the tuning fork is then pressed into contact with a wooden tabletop while the fork continues to vibrate.

Audio physical commonsense (A-PC)

  • A faint hum from the airborne tuning fork is audible before the tabletop contact.
  • The hum becomes much louder and richer once the fork base contacts the wooden tabletop.

Cross-modal physical commonsense (AV-PC)

  • The hum onset in the audio aligns in time with the visible strike of the tuning fork.
  • The jump in loudness coincides in time with the visible moment the fork base contacts the tabletop.