Domain: Natural Science — Physics
Target concept: The Effect of Pressure

Video generation prompt: Two transparent cubic containers are placed side by side on a table, each containing sand with equal volume and initial height. A identical cylindrical wooden stake is placed on the sand on both sides. A metal weight is placed on the stake on the right side to apply a greater pressure, while no weight is placed on the left side.

Evaluation guide:
(i) Target concept: Pressure depends on applied force and contact area; for identical area, greater force produces greater pressure and thus greater deformation in deformable media.
Minimum mechanism: Sand must behave as a cohesionless granular solid under quasi-static loading; stakes must maintain vertical orientation and constant cross-section; weight must remain statically coupled to stake without slippage or tipping; container rigidity must prevent bottom flexure.
(ii)Storyline: Frame 0–2: Static wide shot showing two identical containers side-by-side, filled with level sand, stakes upright and unweighted. Frame 3–4: Metal weight is placed onto right stake (clear contact event). Frame 5–10: Right-side sand surface progressively lowers beneath stake while left side remains static; both stakes retain vertical alignment and full contact with sand; no lateral movement, spillage, or instability; fixed frontal viewpoint ensures unobstructed comparison of sand levels.

Manual:
Experimental Procedure
1. Place two identical transparent cubic containers side-by-side on a flat table.
2. Fill both containers with equal volume of dry sand, leveling to same initial height.
3. Place identical cylindrical wooden stakes upright on sand center in each container.
4. Place a metal weight on top of the right stake only.
Observation of Experimental Phenomena
The sand surface under the right stake sinks deeper than under the left stake; the left sand surface remains unchanged; both stakes stay upright and fully embedded.
Summary of Experimental Principles
Pressure = Force / Area; same stake area + greater force (weight) → greater pressure → greater penetration into sand.

Prompt Grounding rubric:
level_1: Two transparent cubic containers, sand, cylindrical wooden stakes, and the metal weight are not all present, or the containers are stacked one behind the other instead of beside each other on the table, or one container has no sand in it, or no stake stands in the sand on either side, or no metal weight appears anywhere in the shot.
level_2: Both containers and sand are visible beside each other, but the setup is misassigned: the metal weight sits on the left stake instead of the right, or both stakes carry a weight, or neither stake has a weight, or the two stakes clearly differ in diameter or material so they are not identical.
level_3: The two transparent cubic containers sit beside each other on the table, each filled with sand to the same visible starting height; an identical cylindrical wooden stake stands upright in the sand in each container; the left stake carries no weight and the metal weight rests on top of the right stake only; every object is present and correctly assigned to its side.
level_4: All conditions of score 3 are met, and the metal weight is visually distinguishable from the wooden stake (different color or surface sheen), and the sand surface in both containers is flat and undisturbed in the very first frame, and no hand, tool, or label is visible anywhere in the shot.
level_5: All conditions of score 4 are met, and the metal weight is shown making full, flat contact with the top of the right stake at the moment it is placed (not tilted or perched on one edge), and neither container is cropped or partly hidden behind the other at the start of the video, and both stakes are centered in their sand beds with no visible gap between stake and sand at the base.

Scientific and Causal Correctness rubric:
level_1: No differential sand depression appears: the sand under the right stake (weighted) and the sand under the left stake (unweighted) end up at the same depth, or the left side sinks as much as or more than the right side.
level_2: Cause and effect run backwards: sinking on the right begins before the metal weight touches the stake, or the left stake sinks after the weight is placed only on the right, or the right stake pushes into the sand with no visible compression of the sand around it.
level_3: After the weight is placed on the right stake, the sand surface around the right stake visibly drops below the sand surface around the left stake; the left-side sand level stays at its starting height; both stakes remain upright and embedded, with the sinking confined to the area immediately around each stake.
level_4: All conditions of score 3 are met, and the right stake ends up visibly deeper in the sand than the left stake, and the sand keeps close contact against the sides of the right stake as it sinks (no gap opening between stake and sand), and no sudden ejection or scattering of sand grains occurs.
level_5: All conditions of score 4 are met, and the right-side sand level drops in one continuous, monotonic motion with no upward rebound or oscillation, and the left-side sand level stays exactly at its starting height for the whole video, and the final depth difference between the two stakes is clearly larger than at the earlier stage: the greater pressure on the right visibly produces the greater penetration.

Spatiotemporal Consistency rubric:
level_1: The two containers, either stake, or the metal weight jump to a new position or vanish between consecutive frames; the sand surface height in either container changes abruptly with no in-between motion; the shadow cast by a container or stake disappears or relocates for no reason even though the light source has not moved; or a container's edges visibly warp, shear, or buckle between frames.
level_2: One clear break in continuity occurs: a stake shifts position with no visible motion carrying it there, the sand level changes in a single jump rather than a gradual settle, the metal weight appears already seated on the stake with no placement motion shown, or the tabletop appears to bend or ripple under the containers.
level_3: The two containers stay in the same place relative to each other and to the table for the whole video; each stake stays centered on its sand bed; the metal weight stays on top of the right stake once placed; the sand surface on each side changes only gradually, never in a jump; and the shadow each object casts keeps the same length and falls the same way from start to finish.
level_4: All conditions of score 3 are met, and the right stake's descent into the sand is gradual and stays vertical rather than tilting or drifting sideways, and the metal weight neither slides across nor rotates on top of the stake as it sinks, and the front-to-back layering of stake, weight, and container walls stays consistent, with nothing appearing to pass through another object.
level_5: All conditions of score 4 are met, and the camera framing never pans, tilts, or zooms during the video, and the container walls stay straight-edged with sharp corners and no warping of their outline as the stake sinks, and the sinking sand and stake surfaces show no sudden texture swap, cloning, or warping artifact at any point in the sequence.