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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]. --- *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.

h2. Problem Cues

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

h4. Prior Models

None.

h4. Vocabulary

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

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h2. System

h4. Constituents

A single [point particle|point particle] (or a system treated as a point particle with position specified by the center of mass).

h4. State Variables

Time (_t_), position (_x_) and velocity (_v_).

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h2. Interactions

h4. Relevant Types

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

h4. Interaction Variables

None.

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h2. Model

h4. Law of Change
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{latex}\begin{large}$x =  x_{\rm i} + v (t - t_{\rm i})$\end{large}{latex}\\
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h2. DiagrammaticalDiagrammatic Representations

* Position versus time graph.

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h2. Relevant Examples

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