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{td:alignwidth=center350px|bgcolor=#F2F2F2}*[Model Hierarchy]*
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h2.
h1. One-Dimensional Motion with Constant Velocity

h4. {toggle-cloak:id=desc} Description and Assumptions

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{excerpt:hidden=true}*System:* One [point particle]. --- *Interactions:* No acceleration (zero net force).{excerpt}

This model is applicable to a single [point particle] moving with constant velocity.  It is a subclass of the [One-Dimensional Motion with Constant Acceleration|1-D Motion (Constant Acceleration)] model defined by the constraint _a_ = 0.
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h2.h4. {toggle-cloak:id=cues} Problem Cues

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For pure kinematics problems, the problem will often explicitly state that the velocity is constant, or else some quantitative information will be given (e.g. a linear position versus time plot) that implies the velocity is constant.  
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h2. Prerequisite Knowledge

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h4. {toggle-cloak:id=pri} Prior Models

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None.
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h4. {toggle-cloak:id=vocab} Vocabulary

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* [position (one-dimensional)]
* [velocity]


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h2. Model

h4. {toggle-cloak:id=sys} {color:red} System{color}

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A single [point particle|point particle] (or a system treated as a point particle with position specified by the center of mass).
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h2. Interactions
h4. {toggle-cloak:id=int} {color:red}Interactions{color}

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In order for the velocity to be constant, the system must be subject to no _net_ interaction.

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h2. Model

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h4. {toggle-cloak:id=law} {color:red}Law of Change{color}

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{latex}\begin{large}$x =  x_{\rm i} + v (t - t_{\rm i})$\end{large}{latex}\\
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h2. Diagrammatic Representations
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h4. {toggle=cloak:id=diag} {color:red}Diagrammatic Representations{color}

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* Position versus time graph.


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h2. Relevant Examples

h4. {toggle-cloak:id=all} All Examples Using This Model

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