Add Leaderboard video-generation first-frame assets (batch 261/303)

.gitattributes

@@ -23545,3 +23545,62 @@ Leaderboard/Video[[:space:]]Generation/SinglePhysics/AccelSurfaceSpin__bg222__lw
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Leaderboard/Video Generation/SinglePhysics/ElasticCouple__bg227__1mOJUp_trajectory/caption.txt

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+The truck advances, towing a suspended backpack connected via an elastic rope. The rope remains taut throughout, maintaining tension between the vehicle and the load. As the truck moves, the rope undergoes elastic contraction, generating a horizontal restoring force that draws the backpack toward the rear of the truck. The rope imposes kinematic constraints, strictly limiting the backpack's motion to the instantaneous line of action defined by the rope's direction. Consequently, the suspended object follows the trajectory determined by the connecting medium and maintains the structural integrity of the connection during the process in which dynamic forces act upon the attached mass.

Leaderboard/Video Generation/SinglePhysics/ElasticCouple__bg227__5gnWeW_trajectory/caption.txt

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+The truck remains stationary, towing a suspended load. An elastic rope connects the vehicle rear to the backpack, maintaining constant tension throughout the displacement. The rope elastically contracts, releasing stored energy. This deformation generates a horizontal restoring force, driving the backpack inward, opposite to the direction of motion. The tether acts as a kinematic constraint, restricting the backpack's possible positions to the rope's instantaneous vector. Consequently, the load oscillates slightly along the line of action rather than undergoing free drag. Momentum transfer occurs strictly through the flexible medium connecting the two masses.

Leaderboard/Video Generation/SinglePhysics/ElasticCouple__bg227__HO0N3l_trajectory/caption.txt

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+The truck proceeds forward, with a backpack suspended behind it, connected by an elastic rope remaining taut throughout the motion. As the truck moves, the rope elastically contracts, applying a horizontal restoring force that pulls the backpack toward the truck's rear. This elasticity manifests as continuous tension within the rope. The rope imposes a kinematic constraint, constraining the backpack's motion to the instantaneous line of action defined by the rope's direction. Consequently, the backpack follows closely behind the vehicle, its position strictly determined by the interaction between the truck's velocity and the restoring force generated by the stretched material.

Leaderboard/Video Generation/SinglePhysics/ElasticCouple__bg227__IrtAn4_trajectory/caption.txt

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+The truck advances, with the backpack suspended behind via a taut elastic rope. During motion, the rope maintains tension and elastically contracts as the vehicle advances. This contraction generates a horizontal restoring force, pulling the backpack toward the truck's rear. The connection imposes a kinematic constraint, restricting the backpack's trajectory to the instantaneous line of action determined by the rope's orientation. Elasticity drives the restoring force, while the rope constraint confines motion to the rope axis.

Leaderboard/Video Generation/SinglePhysics/ElasticCouple__bg227__MYRvWR_trajectory/caption.txt

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+A truck advances across sandy terrain, connected by an elastic rope to a backpack suspended behind it. During motion, the rope remains taut, where elastic contraction applies a horizontal restoring force, pulling the backpack toward the truck's rear. This mechanism imposes a kinematic constraint, restricting the backpack's motion along the instantaneous line of action defined by the rope direction. Tension persists within the elastic medium, linking the vehicle and the dragged load. The backpack follows the vehicle trajectory, constrained by the tether geometry, maintaining alignment with the rope orientation.

Leaderboard/Video Generation/SinglePhysics/ElasticCouple__bg227__NKbutD_trajectory/caption.txt

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+A truck proceeds forward, towing a backpack suspended behind via a taut elastic rope. As the vehicle moves, the rope remains taut and undergoes elastic contraction, generating a horizontal restoring force that draws the backpack toward the truck's rear. This interaction demonstrates elasticity maintaining tension throughout the displacement. Kinematic constraints imposed at the attachment restrict the backpack's motion strictly to the instantaneous line of action defined by the rope direction. The backpack is dragged rearward, constrained by tether geometry while sustaining a continuous restoring force derived from rope deformation. Motion persists along the trajectory established by the traction and tension dynamics between the two bodies.

Leaderboard/Video Generation/SinglePhysics/ElasticCouple__bg227__W2RqpS_trajectory/caption.txt

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+The truck advances forward, towing a suspended backpack behind it via an elastic rope. Throughout the displacement, the rope remains taut. As the truck moves, the rope undergoes elastic contraction, applying a horizontal restoring force to pull the backpack backward. This dynamic tension manifests the elastic behavior within the connecting medium. Simultaneously, the rope imposes a kinematic constraint, limiting the backpack's motion solely along the instantaneous line of action defined by the rope's orientation. The system maintains continuous coupling, ensuring the suspended mass follows the truck's trajectory along the fixed axis of the elastic connector without lateral deviation.

Leaderboard/Video Generation/SinglePhysics/ElasticCouple__bg227__YEVdol_trajectory/caption.txt

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+A truck advances on sandy ground, towing a backpack suspended at the rear. An elastic rope connects the vehicle and remains taut. As the truck advances, the rope undergoes elastic contraction, generating a horizontal restoring force that pulls the backpack toward the vehicle's rear. Tension persists without slack, maintaining component connectivity. The rope imposes a kinematic constraint, restricting the backpack's motion to the instantaneous line of action defined by the rope's orientation. Elastic behavior and constraint geometry ensure the suspended body strictly follows the vehicle along the rope axis. No lateral deviation occurs, and the elastic element span transmits force continuously.

Leaderboard/Video Generation/SinglePhysics/ElasticCouple__bg227__fEDRbN_trajectory/caption.txt

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+The truck remains stationary while towing a rear-suspended backpack via a taut elastic rope. The rope undergoes elastic deformation and contraction, exerting a horizontal restoring force that induces backward displacement of the backpack. Tension maintains the connection, permitting slight oscillations of the load relative to the primary mover. The rope enforces kinematic constraints, restricting the trajectory to the instantaneous line of action along the rope's orientation. Motion propagates through the elastic medium, coupling two-body dynamics without rigid fixation. The system elucidates force transmission between the primary mover and the constrained follower mediated by elasticity, sustaining alignment through continuous tension adjustments.