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[
{
"slide": 1,
"fragments": [
{
"fragment_index": -1,
"text_description": "Balanced Forces\nWhen pushes match, nothing budges.",
"image_description": ""
}
]
},
{
"slide": 2,
"fragments": [
{
"fragment_index": -1,
"text_description": "Daily Examples\nBalanced forces cancel each other. Look around—where have you felt them?",
"image_description": ""
},
{
"fragment_index": 1,
"text_description": "1\nClosed door\nPush equally from both sides and the door stays still—forces balance.",
"image_description": ""
},
{
"fragment_index": 2,
"text_description": "2\nTug-of-war pause\nWhen teams pull equally, the rope does not move—net force is zero.",
"image_description": ""
},
{
"fragment_index": 3,
"text_description": "3\nArm-wrestling lock\nIf neither player’s hand moves, their pushes match perfectly—balanced forces.",
"image_description": ""
},
{
"fragment_index": 4,
"text_description": "Pro Tip:\nDrag each example into “Moves” or “Stays still” boxes to test your idea of balanced forces.",
"image_description": ""
}
]
},
{
"slide": 3,
"fragments": [
{
"fragment_index": -1,
"text_description": "What Is It?",
"image_description": ""
},
{
"fragment_index": 1,
"text_description": "Balanced Force",
"image_description": ""
},
{
"fragment_index": 2,
"text_description": "Equal-magnitude forces act in opposite directions on the same object. Net force \\(=0\\). The object stays at rest or moves with constant speed.\nKey condition: no acceleration, no change in motion.",
"image_description": ""
}
]
},
{
"slide": 4,
"fragments": [
{
"fragment_index": -1,
"text_description": "Block on Table",
"image_description": ""
},
{
"fragment_index": 1,
"text_description": "NCERT Fig. 8.3",
"image_description": "https://asset.sparkl.ac/pb/sparkl-vector-images/img_ncert/NnWxY6zWuzJIYcq5gHE2P2ICgXpgS87BktxYV5uw.png"
},
{
"fragment_index": 2,
"text_description": "Equal pulls = Balanced force\nNCERT Fig. 8.3 shows a wooden block pulled from both sides.\nArrows of equal length mean each student applies the same force in opposite directions.\nThe opposite forces cancel, net force becomes 0 N, and the block stays still.",
"image_description": ""
},
{
"fragment_index": 3,
"text_description": "Key Points:\nBalanced forces act in opposite directions with equal magnitude.\nNet force 0 N → no motion or acceleration.",
"image_description": ""
}
]
},
{
"slide": 5,
"fragments": []
},
{
"slide": 6,
"fragments": [
{
"fragment_index": -1,
"text_description": "Multiple Choice Question\nCorrect!\nWell done! Balanced 10 N forces add to a net force of 0 N.\nIncorrect\nCheck the directions: equal and opposite forces cancel, giving zero net force.\n// MCQ interaction logic\n const correctOption = 0; // index of the right answer\n const answerCards = document.querySelectorAll('.answer-card');\n const submitBtn = document.getElementById('submitBtn');\n const feedbackCorrect = document.getElementById('feedbackCorrect');\n const feedbackIncorrect = document.getElementById('feedbackIncorrect');\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 book rests on a table. Gravity pulls it downward with 10 N and the table pushes it upward with 10 N. What is the net force acting on the book?",
"image_description": ""
},
{
"fragment_index": 2,
"text_description": "1\n0 N (balanced)",
"image_description": ""
},
{
"fragment_index": 3,
"text_description": "2\n0 N downward",
"image_description": ""
},
{
"fragment_index": 4,
"text_description": "3\n10 N upward",
"image_description": ""
},
{
"fragment_index": 5,
"text_description": "4\n20 N upward",
"image_description": ""
},
{
"fragment_index": 6,
"text_description": "Hint:\nBalanced forces cancel each other, leaving zero net force.",
"image_description": ""
},
{
"fragment_index": 7,
"text_description": "Submit Answer",
"image_description": ""
}
]
},
{
"slide": 7,
"fragments": [
{
"fragment_index": -1,
"text_description": "Key Takeaways",
"image_description": ""
},
{
"fragment_index": 1,
"text_description": "Equal & opposite\nForces have same size but push in opposite directions.",
"image_description": ""
},
{
"fragment_index": 2,
"text_description": "Net force = 0\nTheir vector sum cancels out, producing zero net force.",
"image_description": ""
},
{
"fragment_index": 3,
"text_description": "Motion unchanged\nObject stays at rest or moves with constant velocity.",
"image_description": ""
},
{
"fragment_index": 4,
"text_description": "Common in life\nExamples: book on table, tug of war stalemate.",
"image_description": ""
},
{
"fragment_index": 5,
"text_description": "Need imbalance\nAn unbalanced force is needed to start, stop or change motion.",
"image_description": ""
}
]
}
]