[Vwdiesel] mileage

[Erik Lane]

On Sun, Nov 29, 2009 at 1:37 PM, Val Christian <val at mongo.mongobird.com> wrote:
> Well, kinetic friction would be a tire sliding on the pavement,
> and static friction would be no relative movement.  Ideal braking will
> have neither individually or a combination of both.

My understanding is that ideal braking is actually right at the edge
of static, with no kinetic. For practical purposes the electronics
need to jump back and forth between the two simply to know where that
edge is.

My statement of it being pure kinetic is just because it's relatively
easy to lock up all the brakes and that is more of fair comparison
between the different vehicles. It's just a simpler way to test them,
is all.

>
> Mass of a vehicle will impact at least two factors (actaully more):
> -the total kinetic energy to bleed away
> -the normal force in friction
>
> Other factors include the moment of the mass, and how the weight shifts
> between tires, etc.

The moment is what causes the changing weight distribution, if we're
talking about the same thing. (Well, unless the load shifts.)