Referring to Fig. P-519, block A weighs 4 kN and B weighs 3 kN. If μ = 0.20 under B, compute the minimum coefficient of friction under A to prevent motion.
Amount of friction in block B at impending motion
Summation of vertical forces in block A
Summation of horizontal forces in block A
Coefficient of friction at A
Another Solution to Problem 520
Sine law to the force polygon B
Sine law to force polygon A