Domain: Natural Science — Physics
Target concept: Bring the magnet close to the iron nail, copper wire, and aluminum sheet, and verify that only the iron nail is attracted by the magnet, while the other metals show no reaction.

Video generation prompt: Physics demonstration experiment: A bar magnet is sequentially brought close to three materials—nail, copper wire, and aluminum sheet. The hand moves the magnet one by one close to each object on the table. The procedure is simple, clear, and sequential.

Evaluation guide:
(i) Target concept: Magnetic attraction is material-specific and requires ferromagnetism.
Minimum mechanism: Ferromagnetic domains in iron align under external field, generating net attraction; copper and aluminum lack spontaneous domain alignment and exhibit negligible induced magnetization at room temperature.
(ii)Storyline: [Frame 0–3]: Static wide shot showing three distinct materials aligned left-to-right on table (iron nail → copper wire → aluminum sheet); bar magnet held off-screen left. [Frame 4–6]: Hand enters frame, moves magnet toward iron nail; nail translates visibly toward magnet before contact. [Frame 7–8]: Hand withdraws magnet, repositions laterally; nail settles. [Frame 9–11]: Hand moves magnet toward copper wire; zero movement observed. [Frame 12–13]: Hand withdraws, repositions. [Frame 14–16]: Hand moves magnet toward aluminum sheet; zero movement observed. All events occur from fixed frontal viewpoint; no occlusion; lighting consistent; motion smooth and causally bound (movement only when magnet near iron).

Manual:
Experimental Procedure
1. Place iron nail, copper wire, and aluminum sheet side-by-side on a flat table.
2. Hold a bar magnet in hand and bring it close to the iron nail — observe attraction.
3. Withdraw magnet, then bring it close to the copper wire — observe no attraction.
4. Withdraw magnet, then bring it close to the aluminum sheet — observe no attraction.
Observation of Experimental Phenomena
Only the iron nail moves toward the magnet during proximity; copper wire and aluminum sheet remain completely motionless.
Summary of Experimental Principles
Magnets exert attractive force only on ferromagnetic materials (e.g., iron); copper and aluminum are non-ferromagnetic and thus show no magnetic response.

Prompt Grounding rubric:
level_1: None of the three test materials (the iron nail, the copper wire, and the aluminum sheet) appear together, or fewer than two of them are shown; no bar magnet appears anywhere in the shot; the objects are not resting on a tabletop; no hand is seen carrying the magnet toward any object.
level_2: The bar magnet and all three materials (iron nail, copper wire, aluminum sheet) sit on the table, but the hand never carries the magnet toward any of them; or the magnet is brought toward only one material; or the materials are approached in the wrong order (e.g., copper wire first); or the hand brings the magnet toward more than one material at the same time.
level_3: The hand holds the bar magnet and brings it, one at a time, toward three separate objects laid out on the table: first the iron nail, then the copper wire, then the aluminum sheet; the nail, wire, and sheet are each recognizable by shape (a slender pointed nail, a length or coil of thin wire, a flat rectangular sheet); the order nail-then-wire-then-sheet is followed, and the hand pulls back between each approach rather than sweeping continuously from one object to the next.
level_4: Everything required for score 3 holds, and in addition: the nail, wire, and sheet stay in their original spots on the table for the whole clip; the magnet never touches any of the three objects during an approach; the hand stays visible on screen throughout all three approaches; nothing else in the shot blocks the view of the magnet or any of the three materials.
level_5: Everything required for score 4 holds, and in addition: the nail, wire, and sheet are laid out in a fixed left-to-right row (nail, then wire, then sheet) for the whole clip; the hand brings the magnet toward each object from the same general direction each time; the camera holds one steady, front-facing view for the entire sequence with no zoom or reframing.

Scientific and Causal Correctness rubric:
level_1: No object shows any pull toward the magnet at all; or the iron nail visibly moves away from the magnet instead of toward it; or the copper wire or aluminum sheet visibly moves toward the magnet; or all three materials react the same way (either all get pulled toward the magnet or none do).
level_2: The iron nail stays still as the magnet approaches it; or the copper wire or the aluminum sheet shows any shift, turn, or wobble as the magnet nears it; or the nail only starts moving after the magnet actually touches it rather than while it is still approaching; or the magnet is shown touching the nail during what is supposed to be the approach phase.
level_3: Only the iron nail visibly moves toward the magnet as it approaches, starting before contact is made; the copper wire and the aluminum sheet show no shifting, turning, or wobbling during their own approach phases; the nail stops moving once the magnet is pulled back or moved on to the next object.
level_4: Everything required for score 3 holds, and in addition: the nail's movement is straight toward the magnet with no sideways drift and without lifting off the table; the copper wire and aluminum sheet keep exactly the same position and orientation before, during, and after the magnet passes near them; no material shows a delayed reaction after the magnet has already moved away.
level_5: Everything required for score 4 holds, and in addition: the nail only moves while the magnet is actually approaching it, not during either of the other two approaches; the copper wire and the aluminum sheet show no visible shifting, tilting, or bending at any point during their approach phases; the nail's motion stops as soon as the magnet stops or pulls back, with no coasting or drifting afterward.

Spatiotemporal Consistency rubric:
level_1: The iron nail, copper wire, or aluminum sheet suddenly appears in a different spot with no visible motion getting it there; an object's size or shape changes abruptly; the shadow on the table vanishes and then reappears; the hand disappears and reappears partway through; the magnet blinks in and out of view.
level_2: The copper wire or aluminum sheet shifts position or rotates between one approach phase and the next with no hand ever touching it; the magnet flips its orientation (e.g., turns end-over-end) with no visible hand motion to cause it; the tabletop or background changes in texture or brightness between shots.
level_3: The nail, wire, and sheet stay in the same relative spots and orientation throughout all three approaches; the hand's motion runs continuously from the first approach to the end of the third with no jump cuts or splices; the shadow cast by the hand and magnet on the table shifts smoothly and matches their movement rather than jumping or flickering.
level_4: Everything described for score 3 holds, and in addition: no blur that obscures which object is which or hides a change in its position; no repeated or stuttering frames; the hand's path toward each object is smooth and moves in one direction without pausing, reversing, or shaking; the magnet steadily gets closer to each material until nearest, then steadily pulls back, without wavering back and forth.
level_5: Everything described for score 4 holds, and in addition: the camera shows no drift or parallax that would suggest hidden camera movement; none of the three materials warps or distorts in shape as the magnet passes near it; the hand never starts moving toward the next object before finishing pulling back from the previous one; the edges of the nail, wire, and sheet stay clear and steady throughout, with no visible shimmering or ghosting trail as they or the magnet move.