calculate the forces involved a conventional basketball rim and support assembly 22 with a force of 230 pounds applied to an outer end of the basketball rim member 50 is used with the following facts in order to determine the breakover pressure at f3 and f4 the angular relationship of a line through support shafts 108 and 110 is indicated a z degrees being 36 9 degrees now with the angle indicated at x degrees set at 2 degrees and 22 5 minutes we can calculate the unknown forces f3 and f4 equ2 from known tables the coefficient of friction at the angle x degrees or 2 degrees 221 2 minutes is 12 1 the formula is as follows however on actual testing of the force f4 with a force of 230 lbs at f1 found f4 to actually be 58 lbs sq inch which indicates the internal friction to be 160 58 or 102 lbs sq inch this is the balanced point between the force of 230 lbs at f1 and the pressure at f4 on the breakover actuator assembly 24 when the basketball rim member 50 remains in the horizontal basketball playing condition an example of a breakover condition as achieved on application of 240 lbs at f1 results in the following this is a greater force than the f4 at a 230 lb force at f1 and causes the breakover of the breakover actuator assembly 24 as the angle z degrees then increases at breakover the internal friction decreases and the force f4 is now being absorbed in the breakover biasing assembly 76 until force f1 is relieved the biasing assembly 76 then returns the basketball rim member.