{
    "quiz": {
        "name": "15_2 Calculating Centres of Mass",
        "intro": "We show how the idea of integration as the limit of a sum can be used to \ufb01nd the centre of mass of an object such as a thin plate (like a sheet of metal). Such a plate is also known as a lamina. An understanding of the term moment is necessary and so this concept is introduced.\n",
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            "heading": "",
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        {
            "firstslot": "4",
            "heading": "Multiple point masses",
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        {
            "firstslot": "7",
            "heading": "Point masses in the plane",
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        },
        {
            "firstslot": "10",
            "heading": "Plane laminas",
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        },
        {
            "firstslot": "12",
            "heading": "Different methods to compute the centre of mass",
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        },
        {
            "firstslot": "15",
            "heading": "Centre of mass of different shapes",
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