Momentum with respect to external Forces

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Short Description of Topic

The Main Idea

Momentum in an open system, is fundamentally different from that within a closed system. No longer do individual elements of a system's momentum equal to each other symettrically to add up to 0, however, they will have to even out to the magnitude of the added Force.

A Mathematical Model

They equation expressing this idea is [math]\displaystyle{ {\frac{d\vec{p}}{dt}}_{system} = \vec{F}_{net} }[/math] where p is the momentum of the system and F is the net force from the surroundings.

A Computational Model

How do we visualize or predict using this topic. Consider embedding some vpython code here Teach hands-on with GlowScript

Examples

Standing on Earth, you throw a small rock with a mass of 0.5 kg into the air. At the instant it leaves your hand, the rock's velocity is <math> \vec{0.1,4.0,0.3} {m/s}<\math> Ignore air resistance.

a. Initial Momentum? <math>m=0.5, \vec{v}={0.1,4,0.3}, \vec{p}={0.05,2,0.15} {kgm/s} <\math>

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See also

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External links

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