The Physics Realism Prompt

This shot involves physical interaction. Help me make it work.

The interaction: [DESCRIBE]
Materials involved: [DESCRIBE]
What must look right: [DESCRIBE]

Assess first:
1. How reliably video models handle this specific interaction
2. Which part is most likely to fail
3. Whether this is achievable at all, or whether I should redesign
   the shot

Then, if achievable:
4. How to describe the interaction so physics reads correctly
5. What to specify about weight, momentum, and material behaviour
6. What to leave out — over-specifying physics often makes it worse
7. The prompt text

If not reliably achievable:
8. The redesigned shot that gets the same idea across
9. Where to cut so the difficult moment happens off-camera
10. Whether a different approach — image-to-video from a still,
    or practical footage — is the right answer

Be honest about the limitations. Liquids, cloth, collisions,
mechanical linkages, and anything requiring conservation of mass
are where generated video most reliably falls apart.