Re: Re[4]: [ATM] Use of bearings in (static) mirror cells

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

Richard, do you have any references stating that friction is linearly
dependent on velocity?
you wrote in a previous post F=a+kV (I attached it down this message), and
that constitutes a linear function by all math definitions.

Even if you decided to "infer" that the constant k sometimes might be not so
constant and dependent on velocity too;-)

Your claim is totally puzzling though that friction is dependent on
_velocity_ and sliding friction coefficient.
All references that I'm aware of , for the past 40 years or so, told me
solid friction is proportional to the normal force to the surface and
friction coefficient but _not_ velocity and _not_  surface size .

You seem to bring something new to very old and well established physics,
and hence my request for references.

thanks,
matt


-----Original Message-----
From: Richard <cnc@cncservo.co.uk>
To: matt <electro_optic@bellsouth.net>
Date: Wednesday, April 20, 2005 10:41 AM
Subject: Re[4]: [ATM] Use of bearings in (static) mirror cells


>Hi matt,
>
>Wednesday, April 20, 2005, 3:13:05 PM, you wrote:
>
>m> now that's a new one, friction allegedly being a linear function of
>m> velocity!
>m> would you happen to have any references for it ? ;-)
>
>Read again - I said Frictional **Force** is proportional to
>velocity. The *coefficient* of sliding friction is a constant.
>And it's a simplification to say it's linear, as I inferred by
>the nonlinear statement.
>
>--
>
>Best regards,
> Richard
>
>
>...........................
>Frictional force, F = a + k.V
>where V is velocity

>a = stiction
>k = coefficient of sliding friction.

>Any change in 'k' with velocity (ie higher terms) have nothing
>to do with stiction, just the possible non linear behave of
>friction.


_______________________________________________
ATM mailing list http://www.atmlist.net/