Challenge on conservation of angular momentum

Abstract

Abstract In order to fix some important concepts of Fundamental Physics, either because they are not usually discussed in depth in theoretical classes and much less at laboratories, or because they are not sufficiently developed in textbooks, it is more effective not to tackle them directly, but to propose a mental or practical experiment to attract the student’s attention by questioning their beliefs about it (erroneous preconceptions). We propose a new example about the conservation of angular momentum of a system of material points in this way previously explained.