Re: What causes a particle in inertial motion to remain in motion?

From	kensi <kkensington01@gmail.invalid>
Newsgroups	sci.physics, alt.fan.cyberchicken
Subject	Re: What causes a particle in inertial motion to remain in motion?
Date	2016-07-18 06:24 -0400
Organization	Aioe.org NNTP Server
Message-ID	<nmiaov$102l$1@gioia.aioe.org> (permalink)
References	<6adc6040-e3c0-497c-927c-7a7b21ff6603@googlegroups.com> <nmfm4c$18mv$1@gioia.aioe.org> <nmh1rb$e19$69@dont-email.me> <9u2oob1tu4kc6q7ijik8v6q5pd9eerdi5k@4ax.com>

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On 17/07/2016 6:52 PM, Sir Gregory Hall, Esq. wrote:
> On Sun, 17 Jul 2016 22:46:03 -0000 (UTC), Nadegda <nad318b404@gmail.invalid> wrote:
>
>> On Sun, 17 Jul 2016 06:19:56 -0400, kensi wrote:
>>
>>> On 16/07/2016 3:43 AM, hanson, socked up as mapou001@gmail.com, wrote:
>>>> What causes a particle in inertial motion to remain in motion?
>>>
>>> According to Noether's Theorem (discovered by a personal hero of mine,
>>> BTW), every differentiable symmetry of the action of a non-dissipative
>>> physical system has a corresponding conservation law. In the case of
>>> spatial translation symmetry (i.e. the laws of physics are the same at
>>> every location) the result is conservation of linear momentum, given
>>> that physics as a whole is not dissipative (has conservation of energy
>>> -- which it does, as it has *time* translation symmetry). So the
>>> particle coasts along a timelike geodesic until given some kind of a
>>> nudge and won't ever accelerate on its own. Said nudge allows it to
>>> exchange some linear momentum with some other particle or particles.
>>>
>>> More at:
>>> https://en.wikipedia.org/wiki/Noether%27s_theorem
>>
>> And kensi solves another one.
>
> No, I'm sorry but kensi seems to be a flatlander.

???

> She clearly has no concept that space itself is curved.

Oh, really? Then explain my use of the term "timelike geodesic" above.

> So there can be NO conservation of linear momentum can exist because
> all momentum necessarily has to be curved in curved space.

It's linear momentum when we're considering motion of the object's 
center of mass. Even if it is not moving in a straight line. The "line" 
in "linear" is then tangential to the object's trajectory, but if that 
trajectory is a geodesic, then that geodesic is actually as straight as 
the tangent can get anyway.

All defined in opposition to *angular* momentum, which involves the 
object's motion degrees of freedom that keep the center of mass in 
place. In simple cases this would be a rigid rotation of the whole 
object, as with a spinning thrown football. But it can be more 
complicated, as witness an atom with its many separately moving electrons.

-- 
"To explain the unknown by the known is a logical procedure; to explain
the known by the unknown is a form of theological lunacy." ~David Brooks
"I get fooled all the time by the constant hosiery parade
in here."                                                     ~Checkmate

Thread

What causes a particle in inertial motion to remain in motion? mapou001@gmail.com - 2016-07-16 00:43 -0700
  Re: What causes a particle in inertial motion to remain in motion? "nuny@bid.nes" <Alien8752@gmail.com> - 2016-07-16 00:57 -0700
    Re: What causes a particle in inertial motion to remain in motion? mapou001@gmail.com - 2016-07-16 02:20 -0700
      Re: What causes a particle in inertial motion to remain in motion? Wally W. <ww84wa@aim.com> - 2016-07-16 10:22 -0400
        Re: What causes a particle in inertial motion to remain in motion? mapou001@gmail.com - 2016-07-16 14:24 -0700
          Re: What causes a particle in inertial motion to remain in motion? Wally W. <ww84wa@aim.com> - 2016-07-17 00:47 -0400
            Re: What causes a particle in inertial motion to remain in motion? "hanson" <hanson@quick.net> - 2016-07-16 22:29 -0700
              Re: What causes a particle in inertial motion to remain in motion? mapou001@gmail.com - 2016-07-16 22:47 -0700
          Re: What causes a particle in inertial motion to remain in motion? Wally W. <ww84wa@aim.com> - 2016-07-17 12:12 -0400
            Re: What causes a particle in inertial motion to remain in motion? mapou001@gmail.com - 2016-07-17 09:55 -0700
              Re: What causes a particle in inertial motion to remain in motion? Sergio <invalid@invalid.com> - 2016-07-17 16:41 -0500
      Re: What causes a particle in inertial motion to remain in motion? "nuny@bid.nes" <Alien8752@gmail.com> - 2016-07-17 12:27 -0700
        Re: What causes a particle in inertial motion to remain in motion? mapou001@gmail.com - 2016-07-17 13:02 -0700
          Re: What causes a particle in inertial motion to remain in motion? "nuny@bid.nes" <Alien8752@gmail.com> - 2016-07-17 16:05 -0700
            Re: What causes a particle in inertial motion to remain in motion? mapou001@gmail.com - 2016-07-17 16:28 -0700
              Re: What causes a particle in inertial motion to remain in motion? "nuny@bid.nes" <Alien8752@gmail.com> - 2016-07-17 19:03 -0700
                Re: What causes a particle in inertial motion to remain in motion? mapou001@gmail.com - 2016-07-17 19:09 -0700
                Re: What causes a particle in inertial motion to remain in motion? pnalsing@gmail.com - 2016-07-17 20:49 -0700
                Re: What causes a particle in inertial motion to remain in motion? mapou001@gmail.com - 2016-07-17 22:33 -0700
                Re: What causes a particle in inertial motion to remain in motion? pnalsing@gmail.com - 2016-07-18 18:42 -0700
                Re: What causes a particle in inertial motion to remain in motion? mapou001@gmail.com - 2016-07-18 19:04 -0700
                Re: What causes a particle in inertial motion to remain in motion? pnalsing@gmail.com - 2016-07-18 19:38 -0700
    Re: What causes a particle in inertial motion to remain in motion? mapou001@gmail.com - 2016-07-16 14:25 -0700
      Re: What causes a particle in inertial motion to remain in motion? "nuny@bid.nes" <Alien8752@gmail.com> - 2016-07-17 12:31 -0700
        Re: What causes a particle in inertial motion to remain in motion? mapou001@gmail.com - 2016-07-17 13:06 -0700
          Re: What causes a particle in inertial motion to remain in motion? "nuny@bid.nes" <Alien8752@gmail.com> - 2016-07-17 13:17 -0700
            Re: What causes a particle in inertial motion to remain in motion? mapou001@gmail.com - 2016-07-17 13:21 -0700
              Re: What causes a particle in inertial motion to remain in motion? Sergio <invalid@invalid.com> - 2016-07-17 16:44 -0500
                Re: What causes a particle in inertial motion to remain in motion? SPQR <SPQR@SPQR.org> - 2016-07-17 16:28 -0600
                Re: What causes a particle in inertial motion to remain in motion? The Starmaker <starmaker@ix.netcom.com> - 2016-07-17 16:59 -0700
                Re: What causes a particle in inertial motion to remain in motion? mapou001@gmail.com - 2016-07-17 17:24 -0700
  Re: What causes a particle in inertial motion to remain in motion? "Colonel Edmund J. Burke" <burkesgurlz@t-girls.com> - 2016-07-16 06:24 -0700
    Re: What causes a particle in inertial motion to remain in motion? mapou001@gmail.com - 2016-07-16 12:44 -0700
  Re: What causes a particle in inertial motion to remain in motion? Odd Bodkin <bodkinodd@gmail.com> - 2016-07-16 13:00 -0500
  Re: What causes a particle in inertial motion to remain in motion? The Starmaker <starmaker@ix.netcom.com> - 2016-07-16 12:04 -0700
    Re: What causes a particle in inertial motion to remain in motion? The Starmaker <starmaker@ix.netcom.com> - 2016-07-17 14:10 -0700
  Re: What causes a particle in inertial motion to remain in motion? "Y.Porat" <y.y.porat@gmail.com> - 2016-07-16 23:16 -0700
    Re: What causes a particle in inertial motion to remain in motion? "hanson" <hanson@quick.net> - 2016-07-17 10:04 -0700
  Re: What causes a particle in inertial motion to remain in motion? kensi <kkensington01@gmail.invalid> - 2016-07-17 06:19 -0400
    Re: What causes a particle in inertial motion to remain in motion? snipeco.2@gmail.com (Sn!pe) - 2016-07-17 11:33 +0100
    Re: What causes a particle in inertial motion to remain in motion? Nadegda <nad318b404@gmail.invalid> - 2016-07-17 22:46 +0000
      Re: What causes a particle in inertial motion to remain in motion? "Sir Gregory Hall, Esq." <greghall@yacht_master.fake> - 2016-07-17 18:52 -0400
        Re: What causes a particle in inertial motion to remain in motion? kensi <kkensington01@gmail.invalid> - 2016-07-18 06:24 -0400
          Re: What causes a particle in inertial motion to remain in motion? Nadegda <nad318b404@gmail.invalid> - 2016-07-19 00:05 +0000
            Re: What causes a particle in inertial motion to remain in motion? "Sir Gregory Hall, Esq." <greghall@yacht_master.fake> - 2016-07-18 20:39 -0400
              Re: What causes a particle in inertial motion to remain in motion? "Checkmate, DoW #1" <Lunatic.Fringe@The.Edge> - 2016-07-18 20:19 -0700
              Re: What causes a particle in inertial motion to remain in motion? kensi <kkensington01@gmail.invalid> - 2016-07-19 06:19 -0400
                Re: What causes a particle in inertial motion to remain in motion? Nadegda <nad318b404@gmail.invalid> - 2016-07-19 23:07 +0000
          a particle in noTthaTguY <abu.kuanysh05@gmail.com> - 2016-07-18 18:44 -0700
      Re: What causes a particle in inertial motion to remain in motion? mapou001@gmail.com - 2016-07-17 15:55 -0700
        Re: What causes a particle in inertial motion to remain in motion? mapou001@gmail.com - 2016-07-17 15:59 -0700
  Re: What causes a particle in inertial motion to remain in motion? Sergio <invalid@invalid.com> - 2016-07-17 12:29 -0500
    Re: What causes a particle in inertial motion to remain in motion? mapou001@gmail.com - 2016-07-17 11:24 -0700
    Re: What causes a particle in inertial motion to remain in motion? xxein1@att.net - 2016-07-17 12:07 -0700
  Re: What causes a particle in inertial motion to remain in motion? mapou001@gmail.com - 2016-07-17 13:26 -0700
  Re: What causes a particle in inertial motion to remain in motion? yanarchi@hotmail.com - 2016-07-18 21:58 -0700
    Re: What causes a particle in inertial motion to remain in motion? mapou001@gmail.com - 2016-07-18 22:03 -0700
  Re: What causes a particle in inertial motion to remain in motion? "reber g=emc^2" <herbertglazier0@gmail.com> - 2016-07-19 09:25 -0700

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