| deans@wdeans.com 2005-07-24, 9:11 pm |
| Greetings,
I ran through your experiment and it doesn't seem to work for me.
> Set up two axles so that you can apply the same constant external torque
> to each.
OK, the only way you could apply a constant external torque is by
making the wheels rapidly accelerate with no brakes applied.
> Set up a hydraulic disc brake on each axle, each brake
> actuated by the same hydraulic line.
OK, this means that each pad will press against the rotor with equal
force.
> Put pads of different materials on each brake.
OK, I'll pretend the pads are Teflon and Asbestos.
> Now apply the external torque and apply hydraulic pressure.
As I apply hydraulic pressure the wheels will slow. The Teflon wheel
will always spin faster than the Asbestos wheel at a fixed external
torque and certain hydraulic pressure. Eventually the Asbestos pad
wheel will stop once the hydraulic pressure is high enough. Later the
Teflon pad wheel will come to a stop once the pressure is still higher.
> The worse pads are the ones that lock their brake first.
Why? Why is the Asbestos pad worse than the Teflon one just because it
locked the brakes first? I don't get it.
> You can actually do this experiment by putting pads of different
> materials on the front brakes of a non-ABS car.
No you cannot. The front wheels will spin at the same speed and so the
same external torque will not be exerted as suggested in your
experiment (unless there is a different hydrolic pressure on each side
which again is in violation of your experiment).
I was so happy when I almost thought you had it Matt. I think you have
come the closest yet.
William
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