78974 20200117221602.0 doi 10.1088/1361-6404/aab98b sideral 105993 ART-2018-105993 eng Gomes, Mário S.M.N.F. The 'spinning disk touches stationary disk' problem revisited: an experimental approach 2018 Access copy available to the general public Unrestricted A popular Newtonian mechanics problem, featured in textbooks, physics olympiads and forums alike, concerns two disks with different radii and moment of inertia that rotate differently and that touch each other. Most students struggle to calculate the final angular velocity of the disks, erroneously attempting to use different conservation laws. In this paper we propose a simple experiment that should help physics teachers explain this challenging exercise in an engaging way for the students. By using a smartphone/tablet and video analysis tools, the angular velocity of both disks can easily be tracked as a function of time, clearly showing the three stages of the interaction (before touching, only one disk rotating; touching with slippage; and touching without slippage). Processing and plotting of the data in a spreadsheet immediately shows which quantities are conserved and which are not. Several extensions to the core experiment are also suggested. info:eu-repo/semantics/openAccess by-nc-nd http://creativecommons.org/licenses/by-nc-nd/3.0/es/ 0.861 2018 PHYSICS, MULTIDISCIPLINARY 64 / 81 = 0.79 2018 Q4 T3 EDUCATION, SCIENTIFIC DISCIPLINES 34 / 41 = 0.829 2018 Q4 T3 0.441 2018 Physics and Astronomy (miscellaneous) 2018 Q2 info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion (orcid)0000-0003-2713-2786 Martín-Ramos, Pablo Universidad de Zaragoza Pereira da Silva, Pedro S Ramos Silva, Manuela 5011 500 Universidad de Zaragoza Dpto. CC.Agrar.y Medio Natural Area Ingeniería Agroforestal 39, 4 (2018), 045709 [9 pp.] Eur. j. phys. EUROPEAN JOURNAL OF PHYSICS 0143-0807 1023663 http://zaguan.unizar.es/record/78974/files/texto_completo.pdf Postprint 100106 http://zaguan.unizar.es/record/78974/files/texto_completo.jpg?subformat=icon icon Postprint oai:zaguan.unizar.es:78974 articulos driver 2020-01-17-21:43:48 ARTICLE