Irregular Objects (1J10.12)
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A piece of wood of irregular shape is hung on a metal pin from various points around its edge. Since the center of mass is directly beneath the point of support in each case, one can find it by using a plumb bob to draw vertical lines from two or more points of support - the lines intersect at the center of mass.
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Also available is an object where the center of mass is outside of the object:
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