{
  "author_stance": "The author advocates for a biomechanical understanding of football performance, urging spectators to view missed shots as physical system failures rather than moral or mental shortcomings.",
  "cites": [
    {
      "detail": "Regulations regarding the coefficient of restitution of a football.",
      "name": "FIFA"
    }
  ],
  "claims": [
    {
      "source": "FIFA",
      "source_span": "Here the coefficient of restitution comes into play, a dimensionless value that measures the elasticity of the impact and which, according to FIFA regulations, must be between 0.79 and 0.88.",
      "text": "The coefficient of restitution for a football impact must be between 0.79 and 0.88.",
      "type": "factual"
    },
    {
      "source": "",
      "source_span": "For the ball to reach an exit velocity of between 25 and 35 meters per second—enough to reduce the goalkeeper's reaction time to less than half a second—the footballer's body must apply an average impact force of approximately 1350 Newtons.",
      "text": "A shot at goal requires an average impact force of approximately 1350 Newtons to reach an exit velocity of 25 to 35 meters per second.",
      "type": "factual"
    },
    {
      "source": "",
      "source_span": "As the game progresses, neuromuscular fatigue begins to degrade the body's ability to contract muscles with the necessary speed and rigidity.",
      "text": "Neuromuscular fatigue degrades the body's ability to contract muscles with the necessary speed and rigidity, causing the kinetic chain to break down.",
      "type": "argument"
    },
    {
      "source": "",
      "source_span": "The loss of striking power in the final stretch of matches is, above all, a consequence of physical wear that weakens the invisible structure of the shot.",
      "text": "The loss of striking power in the final minutes is a result of physical wear rather than a lack of character or concentration.",
      "type": "argument"
    }
  ],
  "entities_discussed": [
    "Kinetic chain",
    "Effective mass",
    "Coefficient of restitution",
    "Neuromuscular fatigue",
    "FIFA"
  ],
  "last_updated": "2026-08-04T16:08:59.922673+00:00",
  "slug": "the-kinetic-chain-the-fragility-of-the-perfect-shot",
  "thesis": "Scoring prowess is not a virtue of will, but a delicate physical system prone to collapse due to the fragility of the kinetic chain under fatigue.",
  "title": "The Kinetic Chain: The Fragility of the Perfect Shot"
}