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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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{excerpt:hidden=true}*System:* Any system can be treated as a [point particle] located at the [center of mass b]. --- *Interactions:* Any.{excerpt}
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h1. Point Particle Dynamics
h4. {toggle-cloak:id=desc} Description and Assumptions
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This [model|model] is applicable to a [point particle] (or to a [system|system] of objects treated as a [point particle|point particle] located at the system's [center of mass b]) when the [external forces|external force] are known or needed. It is a subclass of the model [Momentum and External Force] defined by the constraint _dm/dt_ = 0.
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h4. {toggle-cloak:id=cues} Problem Cues
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This [model|model] is typically applied to find the [acceleration|acceleration] in cases where the [forces|force] will remain constant, such as an object moving along a flat surface like a ramp or a wall. It is also useful in combination with other [models|model], such as when finding the [normal force|normal force] exerted on a passenger in a roller coaster at the top of a loop-the-loop (in which case, it would be combined with [Mechanical Energy and Non-Conservative Work]).
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h4. {toggle-cloak:id=pri} Prior Models
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* [One-Dimensional Motion with Constant Acceleration|1-D Motion (Constant Acceleration)].
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h4. {toggle-cloak:id=vocab} Vocabulary
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h2. Model
h4. {toggle-cloak:id=sys} {color:red}Compatible Systems{color}
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A single [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.
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h4. {toggle-cloak:id=int} {color:red}Relevant Interactions{color}
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[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.
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h4. {toggle-cloak:id=law} {color:red}Law of Change{color}
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