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A jumper with a silk connection. This still photograph introduces Hasarius adansoni. Before jumping, this spider attaches a dragline to its takeoff surface.

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Silk helps control body orientation. High-speed recordings showed draglines helping these spiders adjust body pitch in midair. The connection contributes to stable landing.

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A pull can change motion. Tension acts along the silk toward its anchor. Depending on its direction, that force can influence both movement and body rotation.

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Now isolate a vertical fall. In our lab analogy, gravity drives the fall. The safety line begins pulling only after it becomes taut and stretches.

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A simplification with a clear boundary. One spring and damper represent the loaded line. This vertical fall model does not reproduce a living spider's controlled jump.

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Which line settles with less bouncing?. Keep fall distance and stiffness fixed. Change energy loss, replay both settings, and compare repeated motion after the line becomes taut.