*1.1.2. Tests recommended by FŁT in Kraśnik (MB-2)*

Before the tests were started, in the initial stage, normal force of N= 350 [kG] ≈ 3433 [N] was applied to the bearing. Next the apparatus was switched on for t=30 [min] at the speed of n= 1000 [rpm]. After that the rotational speed was increased to n= 1400 [rpm] and as soon as the system became stable the moment of friction was measured (Mt). Then, the rotational speed was decreased by 200 [rpm] in each step, and on each occasion after the friction node became stable the measurements Mt were taken.
