Hi everyone, Please refer to the attached diagram. I was playing around with pulling tablecloths out from the bottom of plates and objects resting on it, and was getting good results. I also happened to have a cuboid wooden paperweight which was on the table cloth and I noticed that that wooden block would tip and stand up if I didn't pull hard enough (but enough to make it tip). This got me thinking how I would calculate the force required to be exerted on the block in order to achieve this effect. I haven't been able to figure out anything yet, so I would like some inputs. I reformed the effect in the form of a question: A block of wood with mass M, height h and length l is placed on a smooth frictionless surface. A force F is applied at the bottom left edge of the wooden block, causing it to pivot at that edge, counter-clockwise upwards till it is standing up. Find the minimum force required. If one were to consider moments, where would one use as a pivot? If it were at the bottom edge, then F wouldn't generate a torque, and it wouldn't tip. Anywhere else on the cube and the pivot will also rise (will that cause any problems?).