Suppose of uniform thin rod (mass M, length b) is attached to a pivot at the top. A piece of clay of mass m strikes the rod at distance x below the pivot at v0 perpendicular to the rod and sticks to it. I understand the E is not conserved b/c this is an inelastic collision (clay sticks to rod). But would the fraction of E loss be during the collision? I think: Fraction of E loss = E final / E initial where E initial = 1/2mv0^2 but what would E final be? Can someone please help with respect to the rod's rotational and translational E? What would it's moment of inertia be? Should I apply parallel axis theorem?