Domain: Natural Science — Geology & Geophysics
Target concept: Compass needle aligned with the Earth's magnetic north after rotation

Video generation prompt: On the table, one hand rotates the casing of a single compass to randomize the needle, then releases it, allowing it to move freely.

Evaluation guide:
(i) Target concept: Passive magnetic realignment of a freely pivoted compass needle under Earth"s geomagnetic field.
Minimum mechanism: Needle must be magnetized, horizontally suspended on low-friction pivot, isolated from local magnetic interference, and subject to Earth"s dipole field sufficient to overcome rotational inertia and damping.
(ii)Storyline: [Frame 1–3] Compass stationary on table, needle already aligned with “N”. → [Frame 4–6] Hand enters frame, contacts casing, initiates rotation (casing turns, needle lags visibly). → [Frame 7] Hand disengages cleanly; casing continues rotating briefly due to inertia. → [Frame 8–12] Casing slows; needle begins independent oscillation (swings across casing). → [Frame 13–20+] Needle amplitude decreases over successive swings and stabilizes pointing at “N” — all observed from fixed frontal tabletop perspective with full compass and hand visible throughout.

Manual:
Experimental Procedure
1. Place a functional magnetic compass flat on a stable table.
2. With one hand, grasp and rotate the compass casing randomly (≥90° turn).
3. Release the casing — do not touch again.
Observation of Experimental Phenomena
The needle oscillates briefly after release, then damps and settles into a stable orientation aligned with the casing’s engraved “N” mark.
Summary of Experimental Principles
Earth’s magnetic field exerts torque on the magnetized needle, causing it to align with magnetic north; the casing rotation randomizes initial orientation, but the needle’s free pivot allows autonomous realignment.

Prompt Grounding rubric:
level_1: No compass appears in the shot; or no hand is visible; or the casing is never rotated; or the needle never appears; or the tabletop the compass rests on is never shown.
level_2: The compass appears on a visible table, but no hand is shown touching it, or the casing is never rotated, or the needle stays frozen throughout and never appears to move after release, or the needle is hidden from view the entire time.
level_3: The compass sits on a table; a hand visibly grips and turns the casing; the casing rotates; the hand lets go; and the needle is visible before, during, and after release, all within one continuous shot.
level_4: Everything required for score 3 is present, and the casing's rotation is clearly a separate motion from the needle's (the needle visibly lags or swings independently while the casing turns), and the needle stays in view for the whole period after release until it settles.
level_5: Everything required for score 4 is present, only one hand ever touches the compass, the casing is a fully intact, recognizable compass housing (disc or rectangular, with a clear window over the needle), the needle sits centered inside the casing and aligned with its markings, and no other object (magnet, tool, second compass) enters the shot.

Scientific and Causal Correctness rubric:
level_1: The needle points in some arbitrary direction and never changes after release; or it turns in lockstep with the casing with no lag; or it comes to rest pointing south, east, or west relative to the casing's own N mark; or it keeps swinging with no sign of settling; or it stops at an angle that doesn't align with any of the casing's printed directions.
level_2: The needle moves after release but does not settle toward the casing's printed 'N'; or it settles pointing at the mark opposite 'N'; or it oscillates indefinitely without ever converging; or it lines up with the rim of the casing rather than following its own long axis.
level_3: After the casing is rotated and released, the needle swings on its own, briefly oscillates, and settles into a steady orientation that lines up with the casing's printed 'N' mark.
level_4: Everything required for score 3 is present, and the needle's swings visibly shrink in size before it settles (damping), it holds that final orientation steadily for at least about 2 seconds without drifting, and its tip clearly points at the 'N' label rather than at 'S', 'E', 'W', or blank casing.
level_5: Everything required for score 4 is present, the needle's final rest position lines up with both the casing's 'N' mark and the casing's own centerline (it lies straight along the housing's axis of symmetry), and nothing external (a flash of light, a passing shadow, a sudden air current) visibly disturbs it while it is settling.

Spatiotemporal Consistency rubric:
level_1: The compass or the hand jumps to a new position between shots with no motion connecting them; the table's surface abruptly changes texture, color, or position; the casing splits, warps, or disappears mid-rotation; the needle flickers in and out of view; or the lighting suddenly shifts from bright to dark with no cause.
level_2: The hand disappears behind the casing and reappears with its fingers in an inconsistent pose; the casing jumps position between the rotation and the release; the needle appears to detach from its pivot (floats, tilts out of the casing's plane, or separates from center); or the hand's shadow doesn't match where the hand actually is.
level_3: The compass stays put on the table, the hand only touches it while rotating the casing, the casing and needle stay connected with no gaps or warping, and the lighting and shadows shift smoothly and believably as the hand and casing move.
level_4: Everything required for score 3 is present, and the motion is physically coherent: the casing turns about its own vertical axis with no sideways sliding, the needle pivots smoothly about its center with no jerking or skipping, and the compass doesn't visibly grow or shrink between shots.
level_5: Everything required for score 4 is present, the camera framing never pans, tilts, or zooms, the tabletop shows no shift in perspective as the hand and casing move, the needle's pivot point stays put with no visible drift in its on-screen position, and there is no motion blur heavy enough to obscure the compass or the sequence of events.