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{td:align=center|bgcolor=#F2F2F2}*[Model Hierarchy]*
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h2. Description and Assumptions
{excerpt:hidden=true}*System:* One [point particle|point particle] confined to a plane. --- *Interactions:* Any that respect the planar motion.{excerpt}
This model is placed in the hierarchy for intellectual completeness. It is not frequently needed in introductory mechanics, as problems involving kinematics will usually involve situations constrained to fit into one of the submodels of this model.
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