| Topic: |
Science > Physics |
| User: |
"got answers?" |
| Date: |
13 Oct 2004 12:21:23 PM |
| Object: |
linear momentum storage |
Most forces satisfy laws of action-reaction (both strong and weak). Some,
like electromagnetic (Biot-Savart) do not. Even if a collection of particles
interacting electromagnetically have no external forces acting on them, the
total linear momentum is not conserved! My question: does this allow
possibility of momentum storage. A closed system which was always at rest,
suddenly acquired momentum without any external forces?
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| User: "John T Lowry" |
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| Title: Re: linear momentum storage |
13 Oct 2004 12:33:53 PM |
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"got answers?" <it@ti.tit> wrote in message
news:416d6414$3@clarion.carno.net.au...
Most forces satisfy laws of action-reaction (both strong and weak).
Some, like electromagnetic (Biot-Savart) do not. Even if a collection
of particles interacting electromagnetically have no external forces
acting on them, the total linear momentum is not conserved! My
question: does this allow possibility of momentum storage. A closed
system which was always at rest, suddenly acquired momentum without
any external forces?
You also need to consider the momentum in the electromagnetic field.
John T. Lowry
Flight Physics
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| User: "" |
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| Title: Re: linear momentum storage |
13 Oct 2004 02:12:41 PM |
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In article <416d6414$3@clarion.carno.net.au>, "got answers?" <it@ti.tit> writes:
Most forces satisfy laws of action-reaction (both strong and weak). Some,
like electromagnetic (Biot-Savart) do not. Even if a collection of particles
interacting electromagnetically have no external forces acting on them, the
total linear momentum is not conserved!
Of course it is, once you include the momentum of the field as well.
Mati Meron | "When you argue with a fool,
meron@cars.uchicago.edu | chances are he is doing just the same"
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| User: "EjP" |
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| Title: Re: linear momentum storage |
13 Oct 2004 01:55:05 PM |
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got answers? wrote:
Most forces satisfy laws of action-reaction (both strong and weak). Some,
like electromagnetic (Biot-Savart) do not. Even if a collection of particles
interacting electromagnetically have no external forces acting on them, the
total linear momentum is not conserved! My question: does this allow
possibility of momentum storage. A closed system which was always at rest,
suddenly acquired momentum without any external forces?
Total linear momentum is always conserved if you take into
account the momentum of the EM field.
-E
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