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Re: Car acceleration

In a message dated 2/5/2002 5:49:53 PM Central Standard Time, ajmallinckro@CSUPOMONA.EDU writes:


Let's compare on this very simple problem.

A car of mass m starts from rest and accelerates due to a constant
static frictional force F on the tires.  How fast is it going
after moving a distance d?

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?

Bob Carlson