Suppose all the surface in the previous problem are rough. The direction of friction of B due to A

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is upward The normal reaction force on the system (comprising of wall and contact surface of Aand B) is provided by F. As can be seen from the figure, the weight of A and B is in the downward direction. Therefore, the frictional force fA and fBA (friction on B due to A) is in upward direction. [Solution diagram: 66567_solution_1.png]

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