Calculating the Braking Force of a Car

What determines how quickly a car can stop? How do tires and brakes affect braking distance? This video explains an equation that can be used to determine how well a car brakes.

Want to include factors such as rain or ABS no ABS? Here is how to alter the equation. In the original equation, multiply u (frictional coefficient) by acceleration, so the new equation reads:
D=0.5*V^2/(u*a)
Leave a as 1, and change u according to the condition.
With ABS ON: u can be considered 1, since ABS will attempt to maintain peak friction.
With ABS OFF: u will be less than 1, and will equal the frictional coefficient of a tire slipping on pavement.
With RAIN, and ABS ON: u will be less than 1, and will equal the frictional coefficient of a tire on wet pavement.
With RAIN, and ABS OFF: u will be less than 1 (and than with ABS ON), and will be equal to the frictional coefficient of a tire slipping on wet pavement. This is the worst case scenario of the four listed.

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