The results of Friday qualifying determine the order the cars take to the track on Saturday. The fastest car on Friday is the last car out on Saturday �theoretically the best slot. The results of Saturday qualifying determine the starting order of the race.
For Friday qualifying, the driver and his engineers don�t need to concern themselves with anything other than how to get the car around the track on its one flying lap as fast as possible. The car need have only enough fuel on board to get it through an out-lap, the flying lap, and an in-lap. Typically, cars will carry less than 10kg of fuel � compared to as much as 70kg during Saturday qualifying when there also needs to be enough fuel on board to enable the car to do its first race stint on Sunday. The difference between 10kg and 70kg of fuel can be as much as 1.8s per lap at some tracks. In addition to the lower weight, the cars are set up for ultimate speed over one lap, with no compromise for tyre wear or raceablity. For these reasons, on Friday qualifying, you will probably see the cars go faster than at any other stage of the weekend. A spin or a non-completion of a lap on Friday means that you will be at the back of the timesheets and therefore the first one to take to the track for Saturday qualifying � theoretically the slowest slot because the track will be at its dirtiest. Tyres of other cars will clear the dust and build up a layer of rubber on the track surface, making the track faster as the session goes on.
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