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h2. Description
{table:align=right|cellspacing=0|cellpadding=1|border=1|frame=box|width=40%}{tr}{td:align=center|bgcolor=#F2F2F2}*[Model Hierarchy]*{td}{tr}{tr}{td}{pagetree:root=Model Hierarchy|reverse=true}{td}{tr}{table}
{excerpt}This model is applicable to a system of [point particles|point particle] (or [rigid bodies|rigid body] treated as point particles located at the position of the body's center of mass).{excerpt}
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h2. Assumed Knowledge
h4. Prior Models
* [Point Particle Dynamics]
* [One-Dimensional Motion with Constant Acceleration|1-D Motion (Constant Acceleration)]
h4. Vocabulary
* [force]
* [momentum]
* [acceleration]
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h2. Model Specification
h4. System Structure
Internal Constituents: [Point particles|point particle].
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Environment: Only [external forces|external force] need be considered, since [internal forces|internal force] do not change the system momentum.
h4. Descriptors
Object Variables: Mass for each object (_m_^j^), unless momentum is given directly.
State Variables: Velocity (_v_^j^) or momentum (_p_^j^) for each object.
Interaction Variables: External forces (_F_~ext,k~).
h4. Laws of Interaction
{latex}\begin{large}\[ \frac{d\vec{p}_{\rm system}}{dt} = \:\sum_{k=1}^{N_{F}} \vec{F}_{ext,k} \]\end{large}{latex}
where the system momentum is the vector sum of the constituent momenta:
{latex}\begin{large}\[ \vec{p}_{\rm system} = \sum_{j=1}^{N} \vec{p}^{j} \]\end{large}{latex}
where _N_ is the number of system constituents.
h4. Laws of Change
None.
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h2. Relevant Examples
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Momentum and Force
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