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If an object is a constituent of a system, it can be treated as a point particle in the Angular Momentum and Torque model and its sub-models provided that either:#The
- The object's physical dimensions are much smaller than its separation from the chosen axis of rotation AND the object's specific rotational state is not of interest
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- .
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- The object will clearly not rotate about its center of mass
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- as a result of the interactions in the problem.
Examples of problems in rotational dynamics where one or more constituents of a system are treated as point particles are:
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