The main purpose of practice sessions is to enable the teams and drivers to find the optimum set-ups (suspension and aerodynamic settings) for their cars. These set-ups vary according to whether the team is preparing for the optimum one-lap of Friday qualifying or the one-lap-plus-a-race of Saturday and Sunday. They also vary according to the type of tyre the driver and his engineers choose.
Most of the time in Friday practice is spent pin-pointing the ideal balance for one-lap qualifying on Friday afternoon. With very little fuel on board and the need only to do one flying lap, the set up will be very different from that needed for Saturday qualifying and the race � when the cars will run with enough fuel for the race�s first stint. During Friday practice the driver looks for a set-up that gives him instant response into the corners for ultimate onelap speed. During the Saturday practice the goal is more about finding a good level of handling consistency from lap to lap. A car racing on Sunday with a Friday set up would quickly become undriveable.
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