Question

how to calculate the minimum coefficient of static friction between two blocks? what is the formula for that?

ok so I have a problem that has a triangle in the middle and on top of its sides there are two blocks , one in each side with different masses.. i will try to draw it on the bottom ... I'm told that this picture represent a static scene , and asked to find the minimum coefficient of static friction between the blocks and the triangle.

(note: it is an equilateral tingle . The pulley is frictionless and the ropes are mass-less)



that's what I did so far: I sat up the angles to be 60 degrees, and labeled the tension and gravity force, but I'm not sure what to do next.

I know F < or equal to UsN (force less than or equal to static coefficient)