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A tuning fork is struck and held in the air, humming faintly. Its base is then pressed against a wooden box, 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 box

Event: a tuning fork is struck and pressed against a wooden box

Audio presence

  • a tuning fork
  • a wooden box

Sound: tuning fork hum

Key standards

Visual physical commonsense (V-PC)

  • A two-pronged U-shaped tuning fork is struck and then brought into visible contact with a wooden box during the clip.

Audio physical commonsense (A-PC)

  • The tuning-fork hum is faint while the fork is held in air.
  • The hum becomes noticeably louder and fuller when the fork contacts the wooden box.

Cross-modal physical commonsense (AV-PC)

  • The increase in hum loudness coincides temporally with the fork contacting the wooden box.