Recent content by ojb89

So the formula for equation in motion for y-direction (my''=-\frac{\partial V}{\partial y}-mg) that was written in the problem description is wrong based on the choice of the direction of y? It should be my''=-\frac{\partial V}{\partial y}+mg ? I just need to get this confirmed. So F_u goes in...

Homework Statement A pendulum with a mass m hanging on a elastic bug rigid massless rod which may swing in the xy-plane. The pivot point is the origin of the coordinate system. The force acting on the pendulum is the sum of force of an elastic central force directed towards the origin, and...