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physics.fisikastudycenter.com - shortcut to equilibrium cases how to determine the static coefficient of friction. Given two physics mechanics shortcuts in this post.

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Finding static coefficient of friction in the specific of equilibrium cases. See the figures represent problems below:

Case I

The floor is rough, the wall is frictionless
Case II

The wall is rough, the bar tied with string / rope

where θ is the angle between floor and the ladder for case I and between the bar and the rope in case II, a and b are the length of bar at the left and right of the weight of the block. In the case II, the weight of the bar is ignored.

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