About the Teaching of Plane Motion of Rigid Bodies

The study of the motion a rigid body on plane (RBP motion) is usually one most challenging topics that students face in introductory physics courses. In this paper, we discuss couple problems which are typically used basic courses, order to highlight some aspects related RBP not well understood by students. first problem pendulum composed rod and disk. angular frequency calculated two situations: disk fixed free spin. A detailed explanation change from case another given. second ladder slides touching frictionless surface. We use fact contact forces applied surface perform translational rotational work despite total mechanical energy conserved.