GATE Mechanical Engineering (ME) 2020 Shift 2 Solved Paper

An attempt is made to pull a roller of weight W over a curb (step) by applying a horizontalforce F as shown in the figure.The coefficient of static friction between the roller and the ground (including the edge of the step) is $\mathit{\mu }$. Identify the correct free body diagram (FBD) of the roller when the roller is just about to climb over the step.