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System: Any system can be treated as a point particle located at the center of mass. — Interactions: Any. |
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h2. Keys to Applicability
{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 [point particle] (or to a system of objects treated as a point particle located at the system's [center of mass]) when the [external forces|external force] are known or needed. It is often useful in combination with other models that require quantitative knowledge of forces for their application. It is a subclass of the model [Momentum and Impulse] defined by the constraint _dm/dt_ = 0.{excerpt}
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h2. Assumptions and Limitations
h4. Prior Models
* [One-Dimensional Motion with Constant Acceleration|1-D Motion (Constant Acceleration)].
h4. Vocabulary
* [Newton's First Law]
* [Newton's Second Law]
* [Newton's Third Law]
* [mass]
* [acceleration]
* [force]
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h2. Model Specification
h4. System Schema
*[Constituents|system constituent]:* [Point particle|point particle], or a system of constant mass that is treated as a point particle located at the system's center of mass.
*[Interactions|interaction]:* [External forces|external force] must be understood sufficiently to draw a [free body diagram] for the system. [Internal forces|internal force] will always cancel from the equations of Newton's 2nd Law for the system and can be neglected.
h4. Descriptors
*[State Variables|state variable]:* Mass (_m_) (must be constant in this model).
*[Interaction Variables|interaction variable]:* External forces _F_^ext^~k~ (k = 1,2,...,N where N is the number of external forces acting), acceleration (_a_).
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h2. Model Equations
h4. Mathematical Statement of the Model
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