Investigating the role of sliding friction in rolling motion: a teaching sequence based on experiments and simulations

摘要

We designed a teaching-learning sequence on rolling motion, rooted in previous research about student conceptions, and proposing an educational reconstruction strongly centred on the role of friction in different cases of rolling. A series of experiments based on video analysis is used to highlight selected key concepts and to motivate students in their exploration of the topic; and interactive simulations, which can be modified on the fly by students to model different physical situations, are used to stimulate autonomous investigation in enquiry activities. The activity sequence was designed for students on introductory physics courses and was tested with a group of student teachers. Comparisons between pre-and post-tests, and between our results and those reported in the literature, indicate that students' understanding of rolling motion improved markedly and some typical difficulties were overcome.