Re: What amount of acceleration involved is too high for SR to apply?

From	Thomas Heger <ttt_heg@web.de>
Newsgroups	sci.physics.relativity, sci.math
Subject	Re: What amount of acceleration involved is too high for SR to apply?
Date	2026-08-08 07:59 +0200
Message-ID	<ndnuuiF3lnfU1@mid.individual.net> (permalink)
References	(7 earlier) <ndidkfF7dpiU1@mid.individual.net> <WC6dnVrN--QPj-n3nZ2dnZfqn_qdnZ2d@giganews.com> <m5ucnXdPUv233-n3nZ2dnZfqn_udnZ2d@giganews.com> <ndlcfkFl8tjU8@mid.individual.net> <1154bfr$jtrc$2@news.nntp4.net>

Cross-posted to 2 groups.

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Am Freitag000007, 07.08.2026 um 12:19 schrieb Leslie Ruzimatov:
> Thomas Heger wrote:
> 
>> you don't need to have a reference point to measure acceleration, but
>> you need a reference point, if you want to measure your own velocity (in
>> a space like that of SRT).
> 
> yet another student not knowing what acceleration is

Actually I know how 'acceleration' is defined:

https://en.wikipedia.org/wiki/Acceleration

Quote:

"It is defined as the rate of change of the velocity. Like velocity, 
acceleration has a magnitude and a direction, making it a vector quantity"

The direction could be taken from the direction of motion (which is the 
observers own direction 'forward') and some arbitrary point for rotation 
(say: left).

This requires no external reference points, hence acceleration could be 
measured without knowing, where you are.

Velocity, on the other hand, cannot be measured without an external 
reference point, because velocity is a change, too, but not of velocity 
but of distance.

And distance always needs two points at the ends of a straight line.

TH

Thread

Re: What amount of acceleration involved is too high for SR to apply? Hayden Maksimov <mmivy@eh.ru> - 2026-08-01 14:00 +0000
  Re: What amount of acceleration involved is too high for SR to apply? Thomas Heger <ttt_heg@web.de> - 2026-08-03 06:28 +0200
    Re: What amount of acceleration involved is too high for SR to apply? Brooks Mikhaltsov <oov@vhitsair.ru> - 2026-08-03 12:01 +0000
      Re: What amount of acceleration involved is too high for SR to apply? Thomas Heger <ttt_heg@web.de> - 2026-08-05 07:21 +0200
        Re: What amount of acceleration involved is too high for SR to apply? Toney Zolotenkov <ennv@nkt.ru> - 2026-08-06 13:20 +0000
          Re: What amount of acceleration involved is too high for SR to apply? Ross Finlayson <ross.a.finlayson@gmail.com> - 2026-08-06 06:51 -0700
            Re: What amount of acceleration involved is too high for SR to apply? Rondell Martzenkov <dank@lona.ru> - 2026-08-06 13:57 +0000
              Re: What amount of acceleration involved is too high for SR to apply? Ross Finlayson <ross.a.finlayson@gmail.com> - 2026-08-06 07:09 -0700
                Re: What amount of acceleration involved is too high for SR to apply? Yves Bilbasov <say@aee.ru> - 2026-08-06 18:01 +0000
                Re: What amount of acceleration involved is too high for SR to apply? Ross Finlayson <ross.a.finlayson@gmail.com> - 2026-08-06 11:30 -0700
                Re: What amount of acceleration involved is too high for SR to apply? Cole Baharev <bae@avoa.ru> - 2026-08-06 20:01 +0000
                Re: What amount of acceleration involved is too high for SR to apply? Ross Finlayson <ross.a.finlayson@gmail.com> - 2026-08-07 05:02 -0700
            Re: What amount of acceleration involved is too high for SR to apply? Thomas Heger <ttt_heg@web.de> - 2026-08-07 18:53 +0200
          Re: What amount of acceleration involved is too high for SR to apply? Thomas Heger <ttt_heg@web.de> - 2026-08-07 08:44 +0200
            Re: What amount of acceleration involved is too high for SR to apply? Victo Babahanov <biti@nia.ru> - 2026-08-07 10:16 +0000
              Re: What amount of acceleration involved is too high for SR to apply? Lane W <cactus_DAC@yahoo.com> - 2026-08-07 08:12 -0600
                Re: What amount of acceleration involved is too high for SR to apply? Presley Elepov <epse@eeveele.ru> - 2026-08-07 17:41 +0000
                Re: What amount of acceleration involved is too high for SR to apply? Lane W <cactus_DAC@yahoo.com> - 2026-08-07 12:06 -0600
                Re: What amount of acceleration involved is too high for SR to apply? Wilfredo Dogadaev <adaddw@wi.ru> - 2026-08-07 18:38 +0000
                Re: What amount of acceleration involved is too high for SR to apply? Thomas Heger <ttt_heg@web.de> - 2026-08-08 08:09 +0200
                Re: What amount of acceleration involved is too high for SR to apply? Ross Finlayson <ross.a.finlayson@gmail.com> - 2026-08-08 09:25 -0700
              Re: What amount of acceleration involved is too high for SR to apply? Thomas Heger <ttt_heg@web.de> - 2026-08-07 19:13 +0200
      Re: What amount of acceleration involved is too high for SR to apply? Thomas Heger <ttt_heg@web.de> - 2026-08-06 05:33 +0200
        Re: What amount of acceleration involved is too high for SR to apply? Ross Finlayson <ross.a.finlayson@gmail.com> - 2026-08-05 21:48 -0700
          Re: What amount of acceleration involved is too high for SR to apply? Ross Finlayson <ross.a.finlayson@gmail.com> - 2026-08-06 01:13 -0700
            Re: What amount of acceleration involved is too high for SR to apply? Thomas Heger <ttt_heg@web.de> - 2026-08-07 08:32 +0200
              Re: What amount of acceleration involved is too high for SR to apply? Leslie Ruzimatov <lzoiev@smr.ru> - 2026-08-07 10:19 +0000
                Re: What amount of acceleration involved is too high for SR to apply? Lane W <cactus_DAC@yahoo.com> - 2026-08-07 08:35 -0600
                Re: What amount of acceleration involved is too high for SR to apply? Thomas Heger <ttt_heg@web.de> - 2026-08-08 07:59 +0200
                Re: What amount of acceleration involved is too high for SR to apply? Delbert Lohanov <hebh@rdooe.ru> - 2026-08-08 15:29 +0000
                Re: What amount of acceleration involved is too high for SR to apply? Lane W <cactus_DAC@yahoo.com> - 2026-08-08 10:57 -0600
                Re: What amount of acceleration involved is too high for SR to apply? Latane Tulebaev <eebet@tvaa.ru> - 2026-08-08 18:38 +0000
                Re: What amount of acceleration involved is too high for SR to apply? Ross Finlayson <ross.a.finlayson@gmail.com> - 2026-08-08 18:04 -0700
        Re: What amount of acceleration involved is too high for SR to apply? Mercury Abdrahmanoff <frm@rbrh.ru> - 2026-08-06 13:51 +0000

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