Frictional force is a source of misconceptions among students, as teachers know from daily experience. This is confirmed by many studies carried out by investigators from all over the world. Surprisingly (or perhaps not), we have found some of these misconceptions among physics school teachers and senior students of physics education courses participating in a workshop in Portugal. In this article we discuss conceptual problems involving frictional force in rotating bodies and suggest teaching strategies based on problem solving, in order to ensure meaningful learning of this difficult topic.