{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,12]],"date-time":"2026-04-12T03:26:04Z","timestamp":1775964364111,"version":"3.50.1"},"reference-count":5,"publisher":"American Association of Physics Teachers (AAPT)","issue":"8","content-domain":{"domain":["pubs.aip.org"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2005,11,1]]},"abstract":"<jats:p>Frictional forces are everywhere. They are probably among the most important macroscopic forces in our daily routine because we depend on them to walk, to pick up objects, and even to eat! They affect our lives in different ways, and thus it is very important to understand them better; this is what we say to our students. There are many experimental methods and techniques to measure static and kinetic frictional forces (and to determine their corresponding coefficients of friction), which we can find in several textbooks.1\u20135 Most of them involve pulling\/pushing blocks along a flat surface and expensive equipment for accurate measuring (sensors, computers, etc.). In this paper we show how to find both coefficients of friction, static and kinetic, with rolling objects instead of blocks in a very simple way and using nonexpensive laboratory equipment.<\/jats:p>","DOI":"10.1119\/1.2120388","type":"journal-article","created":{"date-parts":[[2005,10,13]],"date-time":"2005-10-13T22:00:53Z","timestamp":1129240853000},"page":"548-550","update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":7,"title":["An Inexpensive Technique to Measure Coefficients of Friction with Rolling Solids"],"prefix":"10.1119","volume":"43","author":[{"given":"Paulo Sime\u00e3o","family":"Carvalho","sequence":"first","affiliation":[{"name":"Departamento de F\u00edsica, Faculdade de Ci\u00eancias da Universidade do Porto, Rua do Campo Alegre, 687, P-4169-007 PORTO, Portugal"}]},{"given":"Adriano","family":"Sampaio e Sousa","sequence":"additional","affiliation":[{"name":"Departamento de F\u00edsica, Faculdade de Ci\u00eancias da Universidade do Porto, Rua do Campo Alegre, 687, P-4169-007 PORTO, Portugal"}]}],"member":"3","published-online":{"date-parts":[[2005,10,13]]},"reference":[{"key":"2023062920272341500_r1"},{"key":"2023062920272341500_r2"},{"key":"2023062920272341500_r3"},{"key":"2023062920272341500_r4"},{"key":"2023062920272341500_r5"}],"container-title":["The Physics Teacher"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/pubs.aip.org\/aapt\/pte\/article-pdf\/43\/8\/548\/9852170\/548_1_online.pdf","content-type":"application\/pdf","content-version":"vor","intended-application":"syndication"},{"URL":"https:\/\/pubs.aip.org\/aapt\/pte\/article-pdf\/43\/8\/548\/9852170\/548_1_online.pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2023,6,29]],"date-time":"2023-06-29T20:28:48Z","timestamp":1688070528000},"score":1,"resource":{"primary":{"URL":"https:\/\/pubs.aip.org\/pte\/article\/43\/8\/548\/274504\/An-Inexpensive-Technique-to-Measure-Coefficients"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2005,10,13]]},"references-count":5,"journal-issue":{"issue":"8","published-online":{"date-parts":[[2005,10,13]]},"published-print":{"date-parts":[[2005,11,1]]}},"URL":"https:\/\/doi.org\/10.1119\/1.2120388","relation":{},"ISSN":["0031-921X","1943-4928"],"issn-type":[{"value":"0031-921X","type":"print"},{"value":"1943-4928","type":"electronic"}],"subject":[],"published-other":{"date-parts":[[2005,11]]},"published":{"date-parts":[[2005,10,13]]}}}