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Two blocks A and B have a weight of 10 lb and 6 lb, respectively. They are resting on the incline for which the coefficients of static friction are µA = 15% and µB = 25%. Determine the incline angle for which both blocks begin to slide. Also find the required stretch or compression in the connecting spring for this to occur. The spring has a stiffness of k = 2 lb/ft.
Since Block-A has the lower µS value, it will Slide FIRST, thereby PULLING Block-B Down the ramp with it
Thus expect the Dual-Block Slip-Angle
Take the FBD of both Blocks noting that the Spring Force, FS, will be equal & opposite for both blocks