8-30 Friction - Chapter 8 | Hibbeler Statics 14th ed | Engineers Academy

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Engineering Statics by Hibbeler 14th Edition
Chapter 8: Friction

8–30. 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 mA = 0.15 and mB = 0.25. Determine the incline angle u 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.

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[sszogg]

Tricky. I didn't realize that combining the spring into the Fx equations would solve for an angle that satisfied the conditions of movement in both blocks and the deformation of the spring at the same time. Thanks for being smart!