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Re: [Phys-L] forwarded from physlrnr list: Re: comparison of "frictionless" of air track and maglev



<https://www.minnesotasafetycouncil.org/facts/factsheet.cfm?qs=858251BECECF1976F908D7D68B570E85>

There are many other Google links to the subject - mostly with similar results.

Bob
________________________________________
From: Phys-l <phys-l-bounces@www.phys-l.org> on behalf of Bill Norwood <bnorwood111@gmail.com>
Sent: Friday, June 24, 2016 9:15 AM
To: Phys-L@phys-l.org
Subject: Re: [Phys-L] forwarded from physlrnr list: Re: comparison of "frictionless" of air track and maglev

Bob,
- From what speed does it take a mile for the train to stop?
- If the train could muster enough braking friction to stop in 1/10 the
distance would that buckle the track?
Bill Norwood, U of MD at College Park

On Thu, Jun 23, 2016 at 8:10 PM, LaMontagne, Bob <RLAMONT@providence.edu>
wrote:

Maglev is just a high tech boondoggle - a solution in search of a problem.
Steel wheels rolling on steel rails are around 99% efficient. Even when the
wheels are locked, it takes over a mile to stop a moving train on flat
ground.

Maglev provides no advantage for freight transport. For passenger trains,
a cheaper alternative is to provide dedicated tracks for their use only.
The problem right now is that passenger trains must share track with
freight and delays make it an unpalatable way to travel.

But hey, what's a few trillion dollars in development to the current
government?

Bob at PC
(I ride trains whenever they will get me to the same place as an airline.
They are a relaxing way to travel.)
________________________________________
From: Phys-l <phys-l-bounces@www.phys-l.org> on behalf of Bernard Cleyet <
bernard@cleyet.org>
Sent: Wednesday, June 22, 2016 4:41 PM
To: Forum Physics Educators
Subject: [Phys-L] forwarded from physlrnr list: Re: comparison of
"frictionless" of air track and maglev

On 2016, Jun 21, , at 22:51, Zhang Family <ying123@HOTMAIL.COM> wrote:

Has anyone compared the "frictionless" of air track and maglev? It
seems to us that even though an object is floating with maglev, it stops
after traveling some distance. It seems that the magnetic force acts
horizontally to stop the floating object (except in the super conductor
case). Has anyone successfully created a "frictionless" maglev track with
permanent magnets?

Thanks,

Weijia



bc
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Forum for Physics Educators
Phys-l@www.phys-l.org
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_______________________________________________
Forum for Physics Educators
Phys-l@www.phys-l.org
http://www.phys-l.org/mailman/listinfo/phys-l

_______________________________________________
Forum for Physics Educators
Phys-l@www.phys-l.org
http://www.phys-l.org/mailman/listinfo/phys-l