1. The problem statement, all variables and given/known data Four similar rods of uniform density are connected with frictionless hinges, and this frame is placed to a horizontal smooth tabletop, such that its shape is a square. Vertex P is acted upon by a horizontal force in the direction of the diagonal, and due to this force it begins to move at an acceleration of aP. What is the acceleration of the opposite vertex Q at which it begins to move? 2. Relevant equations 3. The attempt at a solution I have no idea how to begin with this question. I can't visualize how the body would move when only one one of the vetex is given an acceleration. Any help is appreciated. Thanks!