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Re: Car acceleration

In a message dated 2/5/2002 8:15:14 PM Central Standard Time, ajmallinckro@CSUPOMONA.EDU writes:


> > 1. Using pseudowork = change in KE
> >
> >       Fd = mv^2/2 => v = sqrt(2Fd/m)
>
> If you are saying static friction is doing work, then how do you explain it
> does no work on a disk rolling down an incline?

But I'm *not* saying that static friction is doing work here. I'm
saying it is doing pseudowork.  It also does pseudowork (of the
negative gender) on a disk rolling down an incline.


As a second thought, I would consider static friction to be a nonconservative force in mechanics.  Do you agree?  If so, then if it does work of the negative gender (is this male or female?), then the total mechanical energy should decrease.  I do not observe this to any significant degree in controlled experiments.  Do you?

Bob Carlson