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  {
    "slide": 1,
    "fragments": [
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        "text_description": "Second Law of Motion\nForce, mass, and motion collide to create acceleration!",
        "image_description": ""
      }
    ]
  },
  {
    "slide": 2,
    "fragments": [
      {
        "fragment_index": 1,
        "text_description": "Everyday Push",
        "image_description": ""
      },
      {
        "fragment_index": 2,
        "text_description": "Term\nForce & Mass\nDefinition\nA force is any push or pull that changes motion. Mass shows how heavy an object is; heavier mass needs greater force for the same speed-up.",
        "image_description": ""
      },
      {
        "fragment_index": 3,
        "text_description": "Push or pull\nMass = heaviness\nMore mass, less acceleration",
        "image_description": ""
      },
      {
        "fragment_index": 4,
        "text_description": "Reflect: Which speeds up faster when kicked equally hard—a football or a bowling ball? Explain using force and mass.",
        "image_description": ""
      }
    ]
  },
  {
    "slide": 3,
    "fragments": [
      {
        "fragment_index": -1,
        "text_description": "Newton’s Second Law",
        "image_description": ""
      },
      {
        "fragment_index": 1,
        "text_description": "\\[F = m a\\]",
        "image_description": ""
      },
      {
        "fragment_index": 2,
        "text_description": "Variable Definitions\nF\nNet force (newton, N)\nm\nMass of body (kilogram, kg)\na\nAcceleration produced (m s\n−2\n)",
        "image_description": ""
      },
      {
        "fragment_index": 3,
        "text_description": "Applications\nKick a Football\nStronger kick (larger F) makes the same ball accelerate faster.\nLoaded vs Empty Cart\nHeavier cart (larger m) needs more force for the same acceleration.\nSource: CBSE Grade 9 Science Textbook",
        "image_description": ""
      }
    ]
  },
  {
    "slide": 4,
    "fragments": [
      {
        "fragment_index": 1,
        "text_description": "Straight-Line Link",
        "image_description": ""
      },
      {
        "fragment_index": 2,
        "text_description": "Force (F) vs Acceleration (a) for a 2 kg block",
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      },
      {
        "fragment_index": 3,
        "text_description": "Force grows directly with acceleration",
        "image_description": ""
      },
      {
        "fragment_index": 4,
        "text_description": "For the fixed mass of 2 kg, doubling the acceleration doubles the required force, giving a straight-line graph that starts at the origin.",
        "image_description": ""
      },
      {
        "fragment_index": 5,
        "text_description": "Key Points:\nGraph is a straight line through (0, 0).\nSlope equals mass: 2 N s² m⁻¹.\nShows direct proportionality \\(F \\propto a\\).",
        "image_description": ""
      }
    ]
  },
  {
    "slide": 5,
    "fragments": []
  },
  {
    "slide": 6,
    "fragments": [
      {
        "fragment_index": -1,
        "text_description": "Quick Check\nSubmit Answer\nCorrect!\nCorrect! 12 ÷ 4 = 3 m/s².\nIncorrect\nCheck the formula again. Force divided by mass gives acceleration.\nconst correctOption = 0;\n    const answerCards = document.querySelectorAll('.answer-card');\n    const submitBtn = document.getElementById('slide-06-d1e4b7-submit');\n    const feedbackCorrect = document.getElementById('slide-06-d1e4b7-feedback-correct');\n    const feedbackIncorrect = document.getElementById('slide-06-d1e4b7-feedback-incorrect');\n\n    let selectedOption = null;\n\n    answerCards.forEach((card, index) => {\n      card.addEventListener('click', () => {\n        answerCards.forEach(c => c.classList.remove('border-blue-500', 'bg-blue-50'));\n        card.classList.add('border-blue-500', 'bg-blue-50');\n        selectedOption = index;\n      });\n    });\n\n    submitBtn.addEventListener('click', () => {\n      if (selectedOption === null) return;\n\n      if (selectedOption === correctOption) {\n        feedbackCorrect.classList.remove('hidden');\n        feedbackIncorrect.classList.add('hidden');\n      } else {\n        feedbackIncorrect.classList.remove('hidden');\n        feedbackCorrect.classList.add('hidden');\n      }\n    });",
        "image_description": ""
      },
      {
        "fragment_index": 1,
        "text_description": "Question\nA 4 kg box experiences a force of 12 N. What is its acceleration?",
        "image_description": ""
      },
      {
        "fragment_index": 2,
        "text_description": "1\n3 m/s²",
        "image_description": ""
      },
      {
        "fragment_index": 3,
        "text_description": "2\n0.3 m/s²",
        "image_description": ""
      },
      {
        "fragment_index": 4,
        "text_description": "3\n48 m/s²",
        "image_description": ""
      },
      {
        "fragment_index": 5,
        "text_description": "4\n8 m/s²",
        "image_description": ""
      },
      {
        "fragment_index": 6,
        "text_description": "Hint:\nUse a = F ÷ m.",
        "image_description": ""
      }
    ]
  },
  {
    "slide": 7,
    "fragments": [
      {
        "fragment_index": -1,
        "text_description": "Key Points",
        "image_description": ""
      },
      {
        "fragment_index": 1,
        "text_description": "Force, mass, and acceleration are linked.",
        "image_description": ""
      },
      {
        "fragment_index": 2,
        "text_description": "Newton’s Second Law: \\(F = m \\times a\\).",
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      },
      {
        "fragment_index": 3,
        "text_description": "For a fixed mass, acceleration rises with greater force.",
        "image_description": ""
      },
      {
        "fragment_index": 4,
        "text_description": "Heavier objects need a stronger push to speed up.",
        "image_description": ""
      },
      {
        "fragment_index": 5,
        "text_description": "Predict motion by simple multiplication or division.",
        "image_description": ""
      },
      {
        "fragment_index": 6,
        "text_description": "Next Steps\nTry solving two textbook problems using \\(F = m a\\).",
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      },
      {
        "fragment_index": 7,
        "text_description": "Thank You!\nWe hope you found this lesson informative and engaging.",
        "image_description": ""
      }
    ]
  }
]