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Description and Assumptions

This model is [generally applicable] (assuming knowledge of the external forces and system constituents).

Problem Cues

This model is especially useful when describing the momentum of systems where external forces are absent (system momentum will be constant) or estimating the force in a process that occurs in a very short time interval as in collisions (impulse will be easier to determine than force).


Page Contents

Prerequisite Knowledge

Prior Models

Vocabulary

Compatible Systems

The system must be effectively composed of point particles, though rigid bodies may be treated as point particles with positions specified by the center of mass positions of the rigid body when this model is used.

Relevant Interactions

Only external forces need be considered, since internal forces do not change the system's momentum.

Model

Relevant Definitions


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Laws of Change

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Differential Form
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[ \sum_

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\frac{d\vec{p}}

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= \sum_

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\vec

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]\end

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Integral Form
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[ \sum_

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\vec

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_

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= \sum_

\vec

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_

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+ \sum_

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\vec

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= \sum_

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\vec

_

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+ \int \sum_

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\vec

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\:dt ]
\end

Diagrammatic Representations

Relevant Examples

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