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ERIC Number: EJ1114137
Record Type: Journal
Publication Date: 2016-Nov
Pages: 10
Abstractor: As Provided
ISSN: ISSN-0031-9120
Work-Energy Theorem and Friction Forces: Two Experiments
Bonanno, A.; Bozzo, G.; Grandinetti, M.; Sapia, P.
Physics Education, v51 n6 Article 065004 Nov 2016
Several studies have showed the subsistence, even in students enrolled in scientific degree courses, of spontaneous ideas regarding the motion of bodies that conflict with Newton's laws. One of the causes is related to the intuitive preconceptions that students have about the role of friction as a force. In fact, in real world novices do not recognise friction as a force, and for this reason they may believe that a motion with a constant speed needs as a necessary condition the presence of a constant force in the same direction of the motion. In order to face these "intuitive ways of reasoning", in this paper we propose two sequential experiments that can allow undergraduate students to clarify the role of friction forces through the use of the work-energy theorem. This is a necessary first step on the way to a deeper understanding of Newton's second law. We have planned our experiments in order to strongly reduce quantitative difficult calculations and to facilitate qualitative comprehension of observed phenomena. Moreover, the proposed activities represent two examples of the recurring methodology used in experimental practices, since they offer the possibility to measure very small physical quantities in an indirect way with a higher accuracy than the direct measurements of the same quantities.
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Publication Type: Journal Articles; Reports - Research
Education Level: Higher Education; Postsecondary Education
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A
Identifiers - Location: Italy
Grant or Contract Numbers: N/A