h2. Description
{excerpt}This model applies ... {excerpt}

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h2. Prerequisite Vocabulary

* [position]
* [velocity]
* [acceleration]

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h2. Model Specification


h4. System Schema

Internal Constituents:  None.  Object must be treated as a point particle.
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External Agents:  Some external influence must be present which produces the acceleration.

h4. Descriptors

Object Variables:  None.
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State Variables:  Time (_t_), position (_x_) , and velocity (_v_) are possible state variables.  Note that in some cases only two of the three possible state variables will be needed.
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Interaction Variables: 

h4. Laws of Interaction


h4. Laws of Change

{latex}\begin{large}$vec v = ..$\end{large}{latex}\\
{latex}\begin{large}$vec v = ..$\end{large}{latex}\\
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h2. Relevant Examples

{contentbylabel:1d_motion}
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