{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,2,21]],"date-time":"2025-02-21T23:02:24Z","timestamp":1740178944909,"version":"3.37.3"},"reference-count":0,"publisher":"Pontifical Catholic University of Sao Paulo (PUC-SP)","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Hist. Ciencia Ens."],"abstract":"<jats:p>Resumo Aprendemos no liceu e na universidade que a segunda lei de Newton e\u0301 F=ma. Pore\u0301m, Newton nunca escreveu a equac\u0327a\u0303o. Ale\u0301m disso, na\u0303o ha\u0301 acordo entre os historiadores da cie\u0302ncia em relac\u0327a\u0303o a\u0300 equac\u0327a\u0303o que expressa a segunda lei de Newton. Fi\u0301sicos do se\u0301c. XVIII, que citaram e explicaram as leis de Newton, na\u0303o usaram F=ma. Portanto, se a tese dos manuais contempora\u0302neos fosse correta, teri\u0301amos de admitir que todos aqueles fi\u0301sicos interpretaram mal a segunda lei de Newton. Por outro lado, Euler defendeu ter descoberto um novo princi\u0301pio de meca\u0302nica, que e\u0301 F = ma. Comparando a segunda lei de Newton e o princi\u0301pio de Euler compreendemos que elas diferem significativamente. Este resultado da pesquisa histo\u0301rica tem implicac\u0327o\u0303es nos problemas conceptuais da meca\u0302nica e na resoluc\u0327a\u0303o de problemas, como iremos ver.Palavras-chave: A segunda lei de Newton; o princi\u0301pio de Euler; manuais. Abstract We learned at high school and university that Newton\u2019s second law is F=ma. However, Newton never wrote this equation. Furthermore, there is no agreement among historians of science as to the equation that expresses Newton\u2019s second law. 18th century physicists, who quoted and explained Newton\u2019s laws of motion, did not use F=ma. Therefore, if contemporary textbook writers\u2019 claim were correct, we would have to admit that all those physicists misunderstood Newton\u2019s second law. They did not grasp that his law was F=ma. Furthermore, Euler claimed to have discovered a principle of mechanics, which is F=ma. This paper of Euler provides us with the means of clarifying the issue. We can compare Newton\u2019s second law and Euler\u2019s principle with each other and verify whether there are significant differences between both laws. The result is that Newton\u2019s second law is not Euler's principle. This result of historical research has implications for the conceptual problems of mechanics and problem solving, as we shall see. Keywords: Newton\u2019s second law; Euler\u2019s principle; textbooks.<\/jats:p>","DOI":"10.23925\/2178-2911.2019v20espp536-549","type":"journal-article","created":{"date-parts":[[2020,1,20]],"date-time":"2020-01-20T05:52:33Z","timestamp":1579499553000},"page":"536-549","source":"Crossref","is-referenced-by-count":0,"title":["Manuais e Hist\u00f3ria da Ci\u00eancia: a segunda lei de Newton"],"prefix":"10.23925","volume":"20","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8422-3057","authenticated-orcid":false,"given":"Ricardo","family":"Lopes Coelho","sequence":"first","affiliation":[]}],"member":"10019","published-online":{"date-parts":[[2019,12,29]]},"container-title":["Hist\u00f3ria da Ci\u00eancia e Ensino: construindo interfaces"],"original-title":[],"link":[{"URL":"https:\/\/revistas.pucsp.br\/hcensino\/article\/viewFile\/43792\/31022","content-type":"application\/pdf","content-version":"vor","intended-application":"text-mining"}],"deposited":{"date-parts":[[2020,1,20]],"date-time":"2020-01-20T05:52:37Z","timestamp":1579499557000},"score":1,"resource":{"primary":{"URL":"https:\/\/revistas.pucsp.br\/hcensino\/article\/view\/43792"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2019,12,29]]},"references-count":0,"URL":"https:\/\/doi.org\/10.23925\/2178-2911.2019v20espp536-549","relation":{},"ISSN":["2178-2911"],"issn-type":[{"type":"electronic","value":"2178-2911"}],"subject":[],"published":{"date-parts":[[2019,12,29]]}}}