Sliding Bookcase - PROBLEM; - A uniform rectangular bookcase of height Hand width W: Hfz is to be pushed at a constant velocity across a level floor - 111e bookcase is pushed horizontally at its top edge, at the distance H above the floor * What is the maximum value the coefficient of kinetic friction between the bookcase and the floor can have if the bookcase is not to tip over while being pushed? . THINK . The bottom part of the bookcase always stays in contact with the ground - The condition for the bookcase not tipping over is that the sum of the torques about a pivot point must equal zero and the sum of the forces in the x and y direction sum to zero March 21, 2012