Re: Re[6]: [ATM] Use of bearings in (static) mirror cells

["matt" <electro_optic@bellsouth.net>]

is this an attempt at humor, or just a case of total misunderstanding ?

We were discussing solid friction as in mirror cells with bearings vs.
flexure stages not aerodynamic drag, hydrodynamic or other totally unrelated
phenomena.

See the title of bearings in mirror cells and other posts in this thread .

thanks,
matt

p.s. I'm not sure at all what you're trying to say by your reply:
"Your claim is totally puzzling though that friction is dependent on
_velocity_ and sliding friction coefficient."
"It's the only definition I have ever seen. Try pulling a heavy weight on a
sled. Now try running..."

what exactly has running or pulling a heavy weight have to do with the
_definition_ of coefficient of friction ? I would appreciate an answer that
refers to physics rather than to one's own person or subjective attempts,
feelings etc.




-----Original Message-----
From: Richard <cnc@cncservo.co.uk>
To: matt <electro_optic@bellsouth.net>
Date: Wednesday, April 20, 2005 1:08 PM
Subject: Re[6]: [ATM] Use of bearings in (static) mirror cells


>Hi matt,
>
>Wednesday, April 20, 2005, 4:51:02 PM, you wrote:
>
>m> you wrote in a previous post F=a+kV (I attached it down this message),
and
>m> that constitutes a linear function by all math definitions.
>
>Yes, but F is frictional ***FORCE***, not friction.
>
>m> Even if you decided to "infer" that the constant k sometimes might be
not so
>m> constant and dependent on velocity too;-)
>
>There can be higher order terms, but they don't usually go under
>the nmae of friction. Aerodynamic drag for instance, goes as V
>to the power of about 1.5.
>
>m> Your claim is totally puzzling though that friction is dependent on
>m> _velocity_ and sliding friction coefficient.
>
>It's the only definition I have ever seen. Try pulling a heavy
>weight on a sled. Now try running...
>
>--
>
>Best regards,
> Richard
>
>
>
>

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