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Re: Train Physics Problem

From Fabian Russell <root@localhost.localdomain>
Newsgroups sci.physics
Subject Re: Train Physics Problem
Date 2015-11-03 05:22 +0000
Organization NewsGuy - Unlimited Usenet $23.95
Message-ID <pan.2015.11.03.05.22.48@localhost.localdomain> (permalink)
References <pan.2015.11.03.02.06.31@localhost.localdomain> <pan.2015.11.03.02.31.46@localhost.localdomain> <pan.2015.11.03.04.38.55@sincity.info> <n19est$qa$1@speranza.aioe.org>

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On Mon, 02 Nov 2015 22:58:04 -0600, gilber34 wrote:

> 
> makes you think, what would a redesigned steam train look like now ?
> 
> using carbon fiber, remove most of the heavy stuff.....
>

It would never work.  Locomotives have to be HEAVY.

In order to generate tractive effort, which is a different name for
the friction force, the locomotive wheels have to exert a tremendous
normal force (i.e. weight) on the rail.  Otherwise, the wheels will
slip and the train won't move.

Recall that the force of static friction = coefficient * normal force

F_static = u * N

For steel wheels on steel rail, the coefficient, u, is 0.3 - 0.4.

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Thread

Train Physics Problem Fabian Russell <root@localhost.localdomain> - 2015-11-03 02:05 +0000
  Re: Train Physics Problem Fabian Russell <root@localhost.localdomain> - 2015-11-03 02:31 +0000
    Re: Train Physics Problem Fabian Russell <root@localhost.localdomain> - 2015-11-03 02:38 +0000
    Re: Train Physics Problem gillyshin <spectrum8@sincity.info> - 2015-11-03 04:38 +0000
      Re: Train Physics Problem gilber34 <fafa@invalid.com> - 2015-11-02 22:58 -0600
        Re: Train Physics Problem Fabian Russell <root@localhost.localdomain> - 2015-11-03 05:22 +0000
  Re: Train Physics Problem Odd Bodkin <bodkinodd@gmail.com> - 2015-11-03 08:38 -0600
    Re: Train Physics Problem Fabian Russell <root@localhost.localdomain> - 2015-11-03 18:19 +0000
      Re: Train Physics Problem Odd Bodkin <bodkinodd@gmail.com> - 2015-11-03 15:00 -0600
        Re: Train Physics Problem Fabian Russell <root@localhost.localdomain> - 2015-11-03 21:22 +0000
          Re: Train Physics Problem Odd Bodkin <bodkinodd@gmail.com> - 2015-11-03 16:55 -0600
            Re: Train Physics Problem Fabian Russell <root@localhost.localdomain> - 2015-11-03 23:19 +0000
        Re: Train Physics Problem Fabian Russell <root@localhost.localdomain> - 2015-11-03 21:31 +0000
          Re: Train Physics Problem Odd Bodkin <bodkinodd@gmail.com> - 2015-11-03 17:17 -0600
    Re: Train Physics Problem benj <none@gmail.com> - 2015-11-03 13:41 -0500
      Re: Train Physics Problem Fabian Russell <root@localhost.localdomain> - 2015-11-03 18:53 +0000
        Re: Train Physics Problem benj <none@gmail.com> - 2015-11-04 18:08 -0500
          Re: Train Physics Problem Fabian Russell <root@localhost.localdomain> - 2015-11-04 23:33 +0000
      Re: Train Physics Problem Odd Bodkin <bodkinodd@gmail.com> - 2015-11-03 15:10 -0600
        Re: Train Physics Problem Fabian Russell <root@localhost.localdomain> - 2015-11-03 21:48 +0000
          Re: Train Physics Problem benj <nobody@gmail.com> - 2015-11-04 02:45 -0500
  Re: Train Physics Problem "reber g=emc^2" <herbertglazier0@gmail.com> - 2015-11-03 09:19 -0800
    Re: Train Physics Problem "reber g=emc^2" <herbertglazier0@gmail.com> - 2015-11-04 15:15 -0800

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