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A book is placed gently on a desk with a barely audible tap. Then the same book is slammed down hard, producing a loud bang.

C2-2-03 Event Transition · source_excitation principle: Strike Force -> Loudness (Mechanics)
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Per-prompt rubric

Basic standards

Visual presence

  • a book
  • a desk

Event: a book is placed or slammed on a desk

Audio presence

  • a book
  • a desk

Sound: a book on desk impact

Key standards

Visual physical commonsense (V-PC)

  • The book visibly contacts the desk twice, first as a gentle placement and then as a forceful slam, with the book itself meeting the desk on each impact.

Audio physical commonsense (A-PC)

  • The second impact is noticeably louder than the first impact.
  • Each impact sound is a real book-on-desk thud.

Cross-modal physical commonsense (AV-PC)

  • Each impact sound aligns in time with the visible contact of the book on the desk.
  • The louder impact corresponds to the forceful book slam.
  • The quieter impact corresponds to the gentle book placement.