{"id":273,"date":"2023-06-22T20:16:32","date_gmt":"2023-06-22T20:16:32","guid":{"rendered":"https:\/\/physigeek.com\/pt\/alavanca-de-primeira-qualidade\/"},"modified":"2023-06-22T20:16:32","modified_gmt":"2023-06-22T20:16:32","slug":"alavanca-de-primeira-qualidade","status":"publish","type":"post","link":"https:\/\/physigeek.com\/pt\/alavanca-de-primeira-qualidade\/","title":{"rendered":"Alavancagem premium"},"content":{"rendered":"<p>Este artigo explica o que s\u00e3o alavancas de primeiro grau e quais s\u00e3o suas partes. Da mesma forma, voc\u00ea encontrar\u00e1 a f\u00f3rmula para alavancas de primeiro grau e um exemplo resolvido passo a passo deste tipo de problema. <\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%C2%BFQue-es-una-palanca-de-primer-grado\"><\/span> O que \u00e9 uma alavanca de primeiro grau?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> A <strong>alavanca de primeiro grau<\/strong> , tamb\u00e9m chamada de <strong>alavanca de primeira classe<\/strong> , \u00e9 uma m\u00e1quina simples formada por uma barra r\u00edgida que gira em torno de um fulcro e possui um peso em cada extremidade da barra.<\/p>\n<p> Assim, a principal caracter\u00edstica das alavancas de primeiro grau \u00e9 que elas possuem um fulcro (fulcro) entre os dois pesos. <\/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-de-premiere-qualite.png\" alt=\"alavanca premium\" class=\"wp-image-4735\" width=\"299\" height=\"251\" srcset=\"https:\/\/physigeek.com\/wp-content\/uploads\/2023\/09\/levier-de-premiere-qualite-300x252.png 300w, https:\/\/physigeek.com\/wp-content\/uploads\/2023\/09\/levier-de-premiere-qualite.png 602w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\"><\/figure>\n<p> Por exemplo, o balancim, a tesoura, a pin\u00e7a ou o alicate s\u00e3o alavancas principais. At\u00e9 o corpo humano pode funcionar como uma alavanca de primeiro grau quando tentamos levantar um peso.<\/p>\n<p> Observe que ambos os corpos exercer\u00e3o uma for\u00e7a vertical descendente na alavanca devido \u00e0 gravidade. Portanto deve-se determinar o ponto onde deve ser colocado o fulcro para que a alavanca de primeiro grau fique equilibrada e n\u00e3o gire para um lado, veremos a seguir como fazer isso. <\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Partes-de-una-palanca-de-primer-grado\"><\/span> Pe\u00e7as de alavanca premium<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> Uma vez que j\u00e1 conhecemos a defini\u00e7\u00e3o de alavanca de primeiro grau, veremos quais s\u00e3o as partes deste tipo de m\u00e1quina simples:<\/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 primeiro grau sobre a qual permanece a barra r\u00edgida. Portanto, ela suporta todo o peso da barra, bem como dos corpos acima dela.<\/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 carga do outro lado.<\/span><\/li>\n<li style=\"margin-bottom:14px\"> <span style=\"color:#101010;font-weight: normal;\"><strong>Carga ou resist\u00eancia (R)<\/strong> : \u00e9 a for\u00e7a que deve ser superada.<\/span><\/li>\n<li style=\"margin-bottom:14px\"> <span style=\"color:#101010;font-weight: normal;\"><strong>Power Arm (BP)<\/strong> : Esta \u00e9 a dist\u00e2ncia entre o poder 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> : \u00c9 a dist\u00e2ncia entre a resist\u00eancia e o ponto de apoio.<\/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\/parties-dun-levier-de-premiere-qualite.png\" alt=\"partes de uma alavanca premium\" class=\"wp-image-4733\" width=\"342\" height=\"255\" srcset=\"https:\/\/physigeek.com\/wp-content\/uploads\/2023\/09\/parties-dun-levier-de-premiere-qualite-300x224.png 300w, https:\/\/physigeek.com\/wp-content\/uploads\/2023\/09\/parties-dun-levier-de-premiere-qualite.png 606w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\"><\/figure>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Formula-de-la-palanca-de-primer-grado\"><\/span> F\u00f3rmula da alavanca de primeiro grau<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> Para que uma alavanca de primeiro grau esteja em equil\u00edbrio, deve-se cumprir a equa\u00e7\u00e3o de que 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 primeiro 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=\"Tipos-de-palancas-de-primer-grado\"><\/span> Tipos de alavancas premium<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> As alavancas de primeiro grau podem ser classificadas em tr\u00eas tipos diferentes:<\/p>\n<ul style=\"color:#4fd12f; font-weight: bold;\">\n<li style=\"margin-bottom:18px\"> <span style=\"color:#101010;font-weight: normal;\"><strong>Alavanca de primeiro grau com fulcro centrado<\/strong> : o fulcro fica bem no meio da barra, ou seja, a dist\u00e2ncia do fulcro \u00e0 pot\u00eancia \u00e9 igual \u00e0 dist\u00e2ncia do ponto de apoio da resist\u00eancia.<\/span><\/li>\n<li style=\"margin-bottom:18px\"> <span style=\"color:#101010;font-weight: normal;\"><strong>Alavanca de primeiro grau com fulcro pr\u00f3ximo \u00e0 resist\u00eancia<\/strong> : O fulcro est\u00e1 mais pr\u00f3ximo da resist\u00eancia do que da pot\u00eancia. Portanto, o bra\u00e7o de pot\u00eancia \u00e9 mais longo que o bra\u00e7o de resist\u00eancia e, portanto, a pot\u00eancia \u00e9 menor que a resist\u00eancia.<\/span><\/li>\n<li style=\"margin-bottom:18px\"> <span style=\"color:#101010;font-weight: normal;\"><strong>Alavanca de primeiro grau com ponto de apoio pr\u00f3ximo da pot\u00eancia<\/strong> : O ponto de apoio est\u00e1 mais pr\u00f3ximo da pot\u00eancia do que da resist\u00eancia. Portanto, o bra\u00e7o de resist\u00eancia \u00e9 mais longo que o bra\u00e7o de pot\u00eancia e, portanto, a pot\u00eancia \u00e9 maior que a resist\u00eancia.<\/span> <\/li>\n<\/ul>\n<div class=\"wp-block-columns is-layout-flex wp-container-4 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\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-de-premier-degre-a-point-dappui-centre.png\" alt=\"fulcro centrado na alavanca de primeiro grau\" class=\"wp-image-4744\" width=\"250\" height=\"274\" srcset=\"https:\/\/physigeek.com\/wp-content\/uploads\/2023\/09\/levier-de-premier-degre-a-point-dappui-centre-273x300.png 273w, https:\/\/physigeek.com\/wp-content\/uploads\/2023\/09\/levier-de-premier-degre-a-point-dappui-centre.png 604w\" sizes=\"auto, (max-width: 273px) 100vw, 273px\"><\/figure>\n<\/div>\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\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\/point-dappui-du-levier-du-premier-degre-proche-de-la-resistance.png\" alt=\"fulcro da alavanca de primeiro grau pr\u00f3ximo \u00e0 resist\u00eancia\" class=\"wp-image-4746\" width=\"250\" height=\"276\" srcset=\"https:\/\/physigeek.com\/wp-content\/uploads\/2023\/09\/point-dappui-du-levier-du-premier-degre-proche-de-la-resistance-271x300.png 271w, https:\/\/physigeek.com\/wp-content\/uploads\/2023\/09\/point-dappui-du-levier-du-premier-degre-proche-de-la-resistance.png 606w\" sizes=\"auto, (max-width: 271px) 100vw, 271px\"><\/figure>\n<\/div>\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\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-dappui-de-premiere-qualite-proche-de-la-puissance.png\" alt=\"ascens\u00e3o do fulcro do primeiro grau perto do poder\" class=\"wp-image-4747\" width=\"250\" height=\"276\" srcset=\"https:\/\/physigeek.com\/wp-content\/uploads\/2023\/09\/levier-dappui-de-premiere-qualite-proche-de-la-puissance-271x300.png 271w, https:\/\/physigeek.com\/wp-content\/uploads\/2023\/09\/levier-dappui-de-premiere-qualite-proche-de-la-puissance.png 606w\" sizes=\"auto, (max-width: 271px) 100vw, 271px\"><\/figure>\n<\/div>\n<\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Ejercicio-resuelto-de-la-palanca-de-primer-grado\"><\/span> Exerc\u00edcio resolvido pela alavanca do primeiro ano<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> Colocamos um corpo de 50 kg em um dos lados de uma alavanca de primeiro grau feita de uma barra r\u00edgida de 300 cm. Se a dist\u00e2ncia entre a carga e o fulcro \u00e9 de 180 cm, quanto deve pesar o corpo colocado do outro lado da alavanca para que esteja em equil\u00edbrio? <\/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 conhecemos apenas a resist\u00eancia (50 kg) e o bra\u00e7o de resist\u00eancia (180 cm). No entanto, como sabemos o comprimento da barra, podemos calcular o bra\u00e7o de pot\u00eancia subtraindo o comprimento total da barra menos o comprimento do bra\u00e7o de resist\u00eancia:<\/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-d8009cd38409af0152df783ad89f3f36_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"BP=300-180=120 \\text{ cm}\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"206\" style=\"vertical-align: 0px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-left\"> Ent\u00e3o, podemos determinar o valor da pot\u00eancia aplicando a f\u00f3rmula para alavancas de primeiro grau:<\/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 na f\u00f3rmula:<\/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-5959be827849cceb2665451a56d8ff0a_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"P\\cdot 120=50\\cdot 180\" title=\"Rendered by QuickLaTeX.com\" height=\"13\" width=\"134\" style=\"vertical-align: 0px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-left\"> E finalmente, 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-78a4d183ce7fc344a8b0a34efc858751_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"P=\\cfrac{50\\cdot 180}{120}\" title=\"Rendered by QuickLaTeX.com\" height=\"39\" width=\"97\" 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-7ace0a567aab127764f2007e8b8f0b3d_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"P=75 \\text{ kg}\" title=\"Rendered by QuickLaTeX.com\" height=\"17\" width=\"79\" style=\"vertical-align: -4px;\"><\/p>\n<\/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 primeiro grau e quais s\u00e3o suas partes. Da mesma forma, voc\u00ea encontrar\u00e1 a f\u00f3rmula para alavancas de primeiro grau e um exemplo resolvido passo a passo deste tipo de problema. O que \u00e9 uma alavanca de primeiro grau? A alavanca de primeiro grau , tamb\u00e9m chamada de &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"https:\/\/physigeek.com\/pt\/alavanca-de-primeira-qualidade\/\"> <span class=\"screen-reader-text\">Alavancagem premium<\/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-273","post","type-post","status-publish","format-standard","hentry","category-dinamico"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.4 - 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