The Traffic Accident Reconstruction Origin -ARnews-

Re: Is Drag Factor Velocity-Dependent or Not?

William Patterson (billyp@bellsouth.net)
Tue, 17 Jun 1997 16:50:23 -0400 (EDT)

I assume that drag factor is the same as dynamic friction which is
sometimes called coefficient of friction, providing all wheels are
braking equally. f = F/W I have heard some discussion about W=KE=F(d)
where KE=1/2Mv2. But I do not believe that I have seen any official
papers on its' comparison or usefulness. Personally, I have run many
test skids at various speeds and could not find any significant change
in results in the tenths column. There were some variations in the
hundreths column, but that is to be expected and not very useful
to the analysis overall. Try it with a drag sled. Pull it fast or slow.
The results are the same. Magnitude and direction do not appear to
influence the outcome. Interesting topic. Hope others post.

William Patterson #580
Trans Tech Services

William Patterson
billyp@bellsouth.net

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