Jeff A said:I've raced go-karts a goodly amount, and in a kart, if you skid AT ALL, you get passed up in the race. It's absolutely a major slow-down to drift in a kart. Not sure if it's the same in a vehicle with a suspension, but I bet it is.
Jeff
Its amazing how many so called "drivers" are out there with so little regard for the laws of physics. Jeff's observations are right on - here's why...
The force a tire can exert on the pavement in any direction is equal to the normal force (think of weight) times the friction coefficient.
When the tire is rolling (grip method) you use the static friction coefficient (Mu sub s) and when it is sliding you use the kinetic friction coefficient (Mu sub k).
The normal force is the same in each case so the amount of grip is then only proportional to the static vs kinetic coefficients. Since the static value is always higher than kinetic, a tire can always exert more force when it is not sliding.
Therefore you could never pass a guy on the track if he is "hooked up" and you are drifting in the same corners in spec cars.
If drifting worked, we could stop faster by locking up all four tires (and save some money on ABS systems too). :smile:
This is even without considering the Next lesson: VECTOR MATH AND THE NEGATIVE IMPLICATIONS FOR DRIFTING-AKA:the larger the drift angle, the higher the component of force in the aft (slow) direction.
And remember students: Sex would be no fun if (Mu sub K) was zero or infinite! :biggrin: