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Old 09-18-2017, 09:48 PM   #1
racingbrake
 
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Default What a car speed means to the brake

When a car stops, the kinetic energy is converted into heat via brakes.

The kinetic energy is equal to 1/2 the product of the mass and the square of the speed. In formula form:



where m is the mass and v is the speed (or the velocity) of the body. In SI units, mass is measured in kilograms, speed in meters per second, and the resulting kinetic energy is in joules.

For example, you would calculate the kinetic energy of a GTR in 1,730 kg mass (~3,800 lbs) traveling at 28.82 m/s (~60 mph, or 96 km/h) as

Ek = 1/2 *1730 * (28.82 m/s)^2 = 865 * 830.6 = 718469 J = 718.47 KJ (Kilo Joules)

Since the kinetic energy increases with the square of the speed, an object doubling its speed has four times as much kinetic energy.

For example, a car traveling twice as fast as another requires four times as much distance to stop, assuming a constant braking force*. As a consequence of this quadrupling, it takes four times the work to double the speed.

* Or if you tried to stop the car in the same distance at 120 mph, you would be putting 4 times more stress to the same brake set up than at 60 mph speed.

Our conclusion and recommendation:

1. Have a basic and clear understanding of the REAL impact of speed increase to the kinetic energy.

2. Choose a proper brake set up (pad compound) and switch the pad between street and track, if not to, then it's safer to go with a track pad and put up with dusting and squeaking on street, than opt a street pad and risk yourself in losing the brake at high speed spirited driving (= tracking).

3. Definition of track driving a car is NOT where you drive it, rather it's HOW (what speed) your drive it.

4. Drive safely and always obey the traffic law in speed limit, over speeding on street/highway not only is unsafe but also is an irresponsible act to public safety.

5. Learn and practice your speed/time attack only at tracks where the only speed limit is sky, with safety precaution against accidents are equipped.
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