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h2. Description
{table:align=right|cellspacing=0|cellpadding=1|border=1|frame=box|width=41%}{tr}{td:align=center|bgcolor=#F2F2F2}*[Model Hierarchy]*{td}{tr}{tr}{td}{pagetree:root=Model Hierarchy}{td}{tr}{table}
{excerpt}This model is applicable to a [point particle] moving with constant [velocity|velocity (one-dimensional)].  It is a subclass of the model [One-Dimensional Motion with Constant Acceleration|1-D Motion (Constant Acceleration)] defined by the constraint _a_ = 0.{excerpt}
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h2. Assumptions and Limitations

h4. Prior Models
* None assumed.

h4. Vocabulary
* [position (one-dimensional)]
* [velocity (one-dimensional)]

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h2. Model Specification

h4. System Schema

*Internal Constituents:* The system must be treated as a [point particle] when using this model.

*External Agents:* [External influences|external influencesforce] must be absent or else cancel so that no [acceleration] results.

h4. Descriptors

*Object Variables:* None.

*State Variables:* v, x, t

*Interaction Variables:* None.

h4. Laws of Interaction

No net interaction is allowed.

h4. Laws of Change

{latex}\begin{large}$x = x_{\rm i} + v(t-t_{\rm i})$\end{large}{latex}\\

h4. Alternative Representations of Laws of Change

The one [Law of Change] for this model can be rearranged to show that the [velocity|velocity (one-dimensional)] is equivalent to the slope of a [position|position (one-dimensional)] versus time graph.  Since this model assumes velocity is constant, the [Law of Change] will result in _linear_ position versus time graphs (i.e. graphs with constant slope).

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h2. Relevant Examples

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