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  • Point Particle:
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    point particle
    point particle
    nopaneltruepoint particle
  • Rigid Body:
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    rigid body
    rigid body
    nopaneltruerigid body
  • Massless Object:
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    massless object
    massless object
    nopaneltruemassless object
  • Infinitely Massive Object:
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    infinitely massive object
    infinitely massive object
    nopaneltrueinfinitely massive object
Note

Some problems solved using angular momentum may involve a person or object changing shape to alter their/its moment of inertia. In this case, the person or object will often be idealized twice, as two different rigid bodies (the "before configuration" and the "after configuration"). This is permissible because a conservation process does not require detailed information about the intermediate stages where the person or object is actually changing shape.

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