{"id":287,"date":"2023-06-22T13:13:03","date_gmt":"2023-06-22T13:13:03","guid":{"rendered":"https:\/\/physigeek.com\/pt\/alavanca-de-terceiro-grau\/"},"modified":"2023-06-22T13:13:03","modified_gmt":"2023-06-22T13:13:03","slug":"alavanca-de-terceiro-grau","status":"publish","type":"post","link":"https:\/\/physigeek.com\/pt\/alavanca-de-terceiro-grau\/","title":{"rendered":"Alavanca de terceiro grau"},"content":{"rendered":"<p>Este artigo explica o que s\u00e3o alavancas de terceiro grau (ou alavancas de terceira classe). Voc\u00ea encontrar\u00e1 assim as caracter\u00edsticas das alavancas de terceiro grau, a f\u00f3rmula deste tipo de alavanca e, por fim, um exerc\u00edcio resolvido passo a passo. <\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%C2%BFQue-es-una-palanca-de-tercer-grado\"><\/span> O que \u00e9 uma alavanca de terceiro grau?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> A <strong>alavanca do terceiro grau<\/strong> , ou <strong>alavanca do terceiro tipo<\/strong> , \u00e9 a alavanca que exerce o esfor\u00e7o (ou pot\u00eancia) entre o ponto de apoio (ou fulcro) e a carga (ou resist\u00eancia).<\/p>\n<p> Ou seja, as alavancas de terceiro grau t\u00eam o fulcro em uma extremidade, a resist\u00eancia na outra extremidade e a pot\u00eancia em algum lugar entre as duas extremidades da alavanca. <\/p>\n<figure class=\"wp-block-image aligncenter size-full is-resized\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/uploads\/2023\/09\/levier-du-troisieme-degre.png\" alt=\"alavanca de terceiro grau, alavanca de terceiro grau, desenho de alavanca de terceiro grau\" class=\"wp-image-5010\" width=\"362\" height=\"359\" srcset=\"https:\/\/physigeek.com\/wp-content\/uploads\/2023\/09\/levier-du-troisieme-degre-300x297.png 300w, https:\/\/physigeek.com\/wp-content\/uploads\/2023\/09\/levier-du-troisieme-degre-150x150.png 150w, https:\/\/physigeek.com\/wp-content\/uploads\/2023\/09\/levier-du-troisieme-degre.png 612w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\"><\/figure>\n<p> Por exemplo, varas de pescar, pin\u00e7as e cortadores de unhas s\u00e3o alavancas de terceiro grau. Todos estes instrumentos s\u00e3o exemplos de alavancas de terceiro grau porque a for\u00e7a est\u00e1 entre o ponto de apoio e a resist\u00eancia. <\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Partes-de-una-palanca-de-tercer-grado\"><\/span> Partes de uma alavanca de terceiro grau<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> Depois de vermos a defini\u00e7\u00e3o da alavanca de terceiro grau, os diferentes componentes deste tipo de alavanca s\u00e3o apresentados a seguir.<\/p>\n<ul style=\"color:#4fd12f; font-weight: bold;\">\n<li style=\"margin-bottom:14px\"> <span style=\"color:#101010;font-weight: normal;\"><strong>Ponto de apoio ou fulcro (F)<\/strong> : \u00e9 a parte da alavanca de terceiro grau sobre a qual permanece o mecanismo.<\/span><\/li>\n<li style=\"margin-bottom:14px\"> <span style=\"color:#101010;font-weight: normal;\"><strong>Esfor\u00e7o ou pot\u00eancia (P)<\/strong> : \u00e9 a for\u00e7a aplicada \u00e0 alavanca para neutralizar a resist\u00eancia em uma extremidade da alavanca.<\/span><\/li>\n<li style=\"margin-bottom:14px\"> <span style=\"color:#101010;font-weight: normal;\"><strong>Carga ou resist\u00eancia (R)<\/strong> : esta \u00e9 a for\u00e7a que deve ser superada.<\/span><\/li>\n<li style=\"margin-bottom:14px\"> <span style=\"color:#101010;font-weight: normal;\"><strong>Bra\u00e7o de for\u00e7a (BP)<\/strong> : \u00e9 a dist\u00e2ncia entre a for\u00e7a e o fulcro.<\/span><\/li>\n<li style=\"margin-bottom:14px\"> <span style=\"color:#101010;font-weight: normal;\"><strong>Bra\u00e7o de resist\u00eancia (BR)<\/strong> : \u00e9 a dist\u00e2ncia entre a resist\u00eancia e o fulcro.<\/span> <\/li>\n<\/ul>\n<figure class=\"wp-block-image aligncenter size-full is-resized\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/uploads\/2023\/09\/caracteristiques-du-levier-de-troisieme-annee.png\" alt=\"caracter\u00edsticas de uma alavanca de terceiro grau\" class=\"wp-image-5009\" width=\"280\" height=\"377\" srcset=\"https:\/\/physigeek.com\/wp-content\/uploads\/2023\/09\/caracteristiques-du-levier-de-troisieme-annee-223x300.png 223w, https:\/\/physigeek.com\/wp-content\/uploads\/2023\/09\/caracteristiques-du-levier-de-troisieme-annee.png 525w\" sizes=\"auto, (max-width: 223px) 100vw, 223px\"><\/figure>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Caracteristicas-de-una-palanca-de-tercer-grado\"><\/span> Caracter\u00edsticas de uma alavanca de terceiro grau<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> <strong>A principal caracter\u00edstica de uma alavanca de terceiro grau<\/strong> \u00e9 que a pot\u00eancia est\u00e1 entre a resist\u00eancia e o fulcro. Portanto, como a resist\u00eancia estar\u00e1 sempre mais distante do fulcro do que a pot\u00eancia, nas alavancas de terceiro grau o bra\u00e7o de resist\u00eancia \u00e9 sempre maior que o bra\u00e7o de pot\u00eancia.<\/p>\n<p> Portanto, o esfor\u00e7o necess\u00e1rio para compensar a resist\u00eancia tamb\u00e9m \u00e9 maior que a resist\u00eancia. Ent\u00e3o neste tipo de alavanca n\u00e3o h\u00e1 ganho mec\u00e2nico, muito pelo contr\u00e1rio. \u00c9 por isso que alavancas de terceiro grau s\u00e3o geralmente usadas para manipular objetos leves, caso contr\u00e1rio, uma for\u00e7a muito grande teria que ser aplicada.<\/p>\n<p> Por outro lado, uma vantagem das alavancas de terceiro grau \u00e9 que permitem obter um movimento de grande resist\u00eancia com um movimento de pequena pot\u00eancia. <\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Formula-de-una-palanca-de-tercer-grado\"><\/span> F\u00f3rmula de uma alavanca de terceiro grau<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> Para que uma alavanca de terceiro grau esteja em equil\u00edbrio, a equa\u00e7\u00e3o deve ser satisfeita: a pot\u00eancia vezes o bra\u00e7o de pot\u00eancia \u00e9 igual \u00e0 resist\u00eancia vezes o bra\u00e7o de resist\u00eancia.<\/p>\n<p> A <strong>f\u00f3rmula para uma alavanca de terceiro grau<\/strong> \u00e9, portanto, a seguinte:<\/p>\n<p class=\"has-text-align-center\">\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/ql-cache\/quicklatex.com-f6834df9d4ef006d7a868d9f1df7af56_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"P\\cdot BP=R\\cdot BR\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"133\" style=\"vertical-align: 0px;\"><\/p>\n<\/p>\n<p style=\"margin-bottom:5px\"> Ouro: <\/p>\n<ul style=\"color:#4fd12f; font-weight: bold;\">\n<li style=\"margin-bottom:5px\"><span style=\"color:#101010;font-weight: normal;\">\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/ql-cache\/quicklatex.com-fda1e51b12ba3624074fcbebad72b1fc_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"P\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"14\" style=\"vertical-align: 0px;\"><\/p>\n<p> \u00e9 o poder (ou esfor\u00e7o). <\/span><\/li>\n<li style=\"margin-bottom:5px\"><span style=\"color:#101010;font-weight: normal;\">\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/ql-cache\/quicklatex.com-fc8acbc9d0331ce1b64fef220d307f4a_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"BP\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"28\" style=\"vertical-align: 0px;\"><\/p>\n<p> \u00e9 a arma do poder. <\/span><\/li>\n<li style=\"margin-bottom:5px\"><span style=\"color:#101010;font-weight: normal;\">\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/ql-cache\/quicklatex.com-d6abdd487c56e5efbb2c9522ed4b9360_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"R\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"14\" style=\"vertical-align: 0px;\"><\/p>\n<p> \u00e9 a resist\u00eancia (ou carga). <\/span><\/li>\n<li style=\"margin-bottom:5px\"><span style=\"color:#101010;font-weight: normal;\">\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/ql-cache\/quicklatex.com-47cb9c1f3d49c4064a8ea053f28ba5f8_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"BR\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"28\" style=\"vertical-align: 0px;\"><\/p>\n<p> \u00e9 o bra\u00e7o da resist\u00eancia. <\/span><\/li>\n<\/ul>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Ejercicio-resuelto-de-la-palanca-de-tercer-grado\"><\/span> Exerc\u00edcio resolvido da alavanca do terceiro grau<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> Numa alavanca de terceiro grau, uma for\u00e7a equivalente a 60 N deve ser exercida para neutralizar uma resist\u00eancia de 15 N localizada a 80 cm do fulcro. Calcule a que dist\u00e2ncia do fulcro a energia \u00e9 aplicada. <\/p>\n<div class=\"wp-block-otfm-box-spoiler-start otfm-sp__wrapper otfm-sp__box js-otfm-sp-box__closed otfm-sp__FFF8E1\" role=\"button\" tabindex=\"0\" aria-expanded=\"false\" data-otfm-spc=\"#FFF8E1\" style=\"text-align:center\">\n<div class=\"otfm-sp__title\"> <strong>veja a solu\u00e7\u00e3o<\/strong><\/div>\n<\/div>\n<p class=\"has-text-align-left\"> Neste problema de alavanca de terceiro grau, somos solicitados a determinar o bra\u00e7o de pot\u00eancia. Ent\u00e3o, para resolver o problema, precisamos aplicar a equa\u00e7\u00e3o da alavancagem:<\/p>\n<p class=\"has-text-align-center\">\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/ql-cache\/quicklatex.com-f6834df9d4ef006d7a868d9f1df7af56_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"P\\cdot BP=R\\cdot BR\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"133\" style=\"vertical-align: 0px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-left\"> Substitu\u00edmos os dados que conhecemos na equa\u00e7\u00e3o:<\/p>\n<p class=\"has-text-align-center\">\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/ql-cache\/quicklatex.com-1dae5ba7078c412fbe57dd6d8fe0008f_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"60\\cdot BP=15\\cdot 80\" title=\"Rendered by QuickLaTeX.com\" height=\"13\" width=\"131\" style=\"vertical-align: 0px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-left\"> E resolvemos a inc\u00f3gnita na equa\u00e7\u00e3o:<\/p>\n<p class=\"has-text-align-center\">\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/ql-cache\/quicklatex.com-6c20589172f022b76c17eb055f14ab91_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"BP=\\cfrac{15\\cdot 80}{60}\" title=\"Rendered by QuickLaTeX.com\" height=\"39\" width=\"103\" style=\"vertical-align: -12px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-center\">\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/ql-cache\/quicklatex.com-4b319952f3a57992cb5e4d229af26b5b_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"BP=20 \\text{ cm}\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"98\" style=\"vertical-align: 0px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-left\"> A pot\u00eancia deve, portanto, ser aplicada a 20 cm do fulcro.<\/p>\n<div class=\"wp-block-otfm-box-spoiler-end otfm-sp_end\"><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Este artigo explica o que s\u00e3o alavancas de terceiro grau (ou alavancas de terceira classe). Voc\u00ea encontrar\u00e1 assim as caracter\u00edsticas das alavancas de terceiro grau, a f\u00f3rmula deste tipo de alavanca e, por fim, um exerc\u00edcio resolvido passo a passo. O que \u00e9 uma alavanca de terceiro grau? A alavanca do terceiro grau , ou &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"https:\/\/physigeek.com\/pt\/alavanca-de-terceiro-grau\/\"> <span class=\"screen-reader-text\">Alavanca de terceiro grau<\/span> Leia mais &raquo;<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"","footnotes":""},"categories":[5],"tags":[],"class_list":["post-287","post","type-post","status-publish","format-standard","hentry","category-dinamico"],"yoast_head":"<!-- This site is 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