Suppose I have a metal rod in empty space with a uniform mass distribution. Suppose a force acts perpendicular to the rod at some distance R from the rod's centre of mass over some time Δt. There are no other forces acting on the rod. (1) What type of motion will the rod have over Δt? Will the rod rotate about the point where the force acts, or will it have some other type of motion? (2) How much of the work done on the rod will be converted to translational kinetic energy and how much will be converted to rotaional kinetic energy? Note that the force does not change direction even as the rod rotates - ie it only acts perpendicular to the rod at the start of its motion. Thank You. BTW - This question is theoretical in nature - ie it doesn't require a calculation so I don't think it counts as a "homework" type question. I've been thinking about this for some time now. Nevertheless, I apologise if I've placed it in the wrong section.