Domain: Humanities and Social Sciences — Sport
Target concept: Demonstration of a Golf Putting Stroke to the Hole

Video generation prompt: On the green, a player gently strikes a golf ball with a putter, sending it rolling across the putting surface toward the hole.

Evaluation guide:
(i) Target concept: Skid-to-roll transition of a golf ball following centered putter impact, governed by green surface friction and topography, culminating in complete hole entry.
Minimum mechanism: Putter impact typically imparts a brief initial skid: right after contact the ball's translational velocity does not yet match its angular velocity (v ≠ ωr) because of putter loft and impact dynamics; green-surface friction then acts on the skidding ball until true rolling (v = ωr) is established, generally within roughly the first 20–40% of its travel distance; from that point onward the ball must continue in pure rolling contact without further sliding, and the hole geometry must allow full submersion upon arrival.
(ii)Storyline: [Frame 0–1] Putter held stationary behind ball on green; [Frame 2–3] Putt impact occurs: ball begins forward motion with a brief initial skid; [Frame 4–7] Ball transitions into and maintains continuous rolling contact with the green surface, keeping spherical form, progressing visibly toward hole; [Frame 8–9] Ball reaches hole rim, makes contact, and fully disappears below cup level; Perspective must be fixed (e.g., low-angle side or slightly elevated frontal view), ensuring all key events (impact, skid-to-roll transition, approach, entry) remain simultaneously visible and unoccluded throughout.

Manual:
Experimental Procedure
1. Position a white dimpled golf ball on a flat section of a well-manicured green.
2. Align a standard putter behind the ball, perpendicular to intended line.
3. Gently strike the ball center with the putter face to send it forward (a brief initial skid before rolling begins is expected).
Observation of Experimental Phenomena
- The ball remains spherical and white throughout.
- Immediately after impact the ball briefly skids; green-surface friction then establishes continuous, ground-coupled rolling directed toward the hole.
- Apart from that brief initial skid, no bounce, hop, or airborne phase occurs.
- Ball enters the hole fully and disappears below the rim without rebound or protrusion.
Summary of Experimental Principles
A putting stroke applies centered, low-loft impact that first imparts a brief skid to the ball; green-surface friction converts this into pure rolling motion within roughly the first 20–40% of its path, after which the ball rolls under control toward the hole, decelerating predictably along the intended line.

Prompt Grounding rubric:
level_1: No golf putter, no golf ball, no green surface, and no hole visible; or scene is unrelated (e.g., tennis court, kitchen, abstract animation); zero matching objects or spatial context from posted_prompt.
level_2: Exactly one of the following is present: putter, ball, green, or hole; all others missing; or presence is ambiguous (e.g., ball appears as a white dot with no texture, putter is unidentifiable due to occlusion/abstraction, hole is a black square without turf rim).
level_3: All four core objects are present and visually identifiable: (a) putter (distinct clubhead + shaft + grip), (b) golf ball (spherical, white, dimpled), (c) green (uniform short-cut grass surface, flat or gently contoured), (d) hole (circular cup with flagstick or visible rim); no object is mislabeled (e.g., no baseball instead of golf ball, no hockey stick instead of putter).
level_4: All four core objects are present and identifiable, AND the putter is in contact with the ball at the start of motion, AND the ball is positioned on the green surface (not airborne, not on sand or fringe), AND the hole is within the same continuous green surface (not isolated on separate plane or background layer).
level_5: All conditions for score 4 are satisfied, AND the putter remains fully visible (no clipping, occlusion, or transparency) throughout contact, AND the ball remains fully visible (no flickering, vanishing, or morphing) during entire roll, AND the hole remains fully visible (rim and cup clearly discernible) until ball enters, AND all objects maintain consistent relative scale (e.g., ball never appears larger than putter head).

Scientific and Causal Correctness rubric:
level_1: No causal relationship between action and result: the ball does not move after the putter contacts it, or moves without contact, or moves opposite the direction of the putter's swing, or enters the hole before any rolling motion, or vanishes mid-roll; or the ball's motion is physically invalid (e.g., it bounces, floats, spins with no forward translation, or changes color/shape).
level_2: The ball moves but the causal chain is broken: (a) contact occurs but the ball never begins moving, OR (b) the ball moves but never travels toward the hole, OR (c) the ball reaches the vicinity of the hole but does not enter it, OR (d) the ball enters the hole without having rolled along the green beforehand (e.g., it teleports to the cup, drops in vertically, or appears blown by wind).
level_3: A believable contact → roll → approach → entry chain is present: the putter contacts the ball, the ball responds with forward motion along the green (a brief skid immediately after contact is expected and acceptable, since impact loft causes real putts to slide before friction establishes rolling), the ball's motion transitions into rolling contact with the green and continues visibly toward the hole, and the ball enters the hole; apart from that brief initial skid, the ball shows no other non-rolling motion (no bounce, hop, or airborne lift), and its path toward the hole is not reversed or interrupted.
level_4: All conditions for score 3 are met, AND the ball's entire path (including the initial skid and subsequent roll) stays on the green surface (no off-green travel onto sand, fringe, or rough), AND once rolling is established the path toward the hole is monotonic (no detour, loop, or backtracking), AND the ball enters the hole only after this full path has been visibly traversed (no premature entry before the approach is shown).
level_5: All conditions for score 4 are met, AND the ball keeps its spherical shape and white color throughout, AND no extraneous state change occurs (no deformation, fragmentation, color shift, or emission), AND after the brief initial skid the rolling motion is smooth and fully ground-coupled with no further slipping, skidding, or floating, AND the hole entry is complete, with the entire ball disappearing below the rim and no partial protrusion or re-emergence.

Spatiotemporal Consistency rubric:
level_1: Severe spatiotemporal violation: teleportation (ball jumps >1x its diameter between frames), abrupt viewpoint shift (e.g., cut from overhead to extreme close-up without transition), structural break (green surface discontinues mid-frame), or light/shadow discontinuity (e.g., shadow vanishes then reappears with different direction).
level_2: Multiple moderate violations: (a) intermittent object flicker (≥2 frames of disappearance), (b) inconsistent lighting (e.g., ball shadow rotates while sun position fixed), (c) perspective distortion (e.g., putter shaft bends unnaturally, green surface warps across frames), (d) temporal jump (e.g., contact frame followed immediately by hole-entry frame with no intermediate roll frames).
level_3: At most one minor spatiotemporal flaw: e.g., single-frame occlusion of ball by putter during contact, or brief (1-frame) shadow inconsistency, or mild motion jerkiness, but no teleportation, no structural break, no viewpoint jump, and green surface remains visually continuous and planar throughout.
level_4: Zero teleportation, zero viewpoint jumps, zero structural breaks, zero light/shadow discontinuities; all objects maintain consistent spatial relationships (e.g., putter-ball distance evolves smoothly, ball-hole proximity decreases monotonically); minor motion jerkiness may occur but does not interrupt perceived continuity of roll.
level_5: All conditions for score 4 are satisfied, AND motion is continuously smooth (no detectable frame stutter, no velocity discontinuity), AND spatial relationships evolve with natural parallax (e.g., ball size increases gradually as it approaches hole), AND lighting remains fully consistent (shadow length/direction evolves plausibly with ball position), AND green surface exhibits uniform texture and curvature without warping or tiling artifacts.