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> > This is confusing to me and I suspect confusing to students. Why not
> > identify the force that is really doing work and go from there?
>
> In this particular case I wouldn't do that because (ignoring air
> resistance and rolling resistance) there *is* no force that is
> doing "real work" on the car.
>
>
Then you would say there is no real work being done? And no real change in
kinetic energy? I would say there is a real force doing work and this comes
from the drive axle applying a normal force on the car.
Bob Carlson