The problem:
A $100\,\mathrm{kg}$ cubical box lies on the floor. A child pushes horizontally at the top edge. What is the magnitude of force to put the box on the verge of tipping over, given that there is sufficient friction between it and the floor to prevent sliding?
My questions:
At which point will gravity act? On center of mass? I am also confused about how the rotation equations should be applied to the box. Will the torque remain constant while box is being pushed?