Find the range of value of $L/D$ such that the system remains in static equilibrium. And explain why such a range exists and not just a single value.
This is the question where I encountered a confusion. I know how friction acts on plane surfaces. But how do I analyze the friction in two places of the diagram marked in red. It's especially confusing to understand in which direction does the normal force act at a corner. Help anyone? It would be great if no one posted a complete solution to the problem (I would love to solve it myself), but instead if someone could provide an approach to solve such a case.