{"id":249,"date":"2023-06-23T08:21:34","date_gmt":"2023-06-23T08:21:34","guid":{"rendered":"https:\/\/physigeek.com\/pt\/coeficiente-de-atrito-estatico-ou-coeficiente-de-atrito-estatico\/"},"modified":"2023-06-23T08:21:34","modified_gmt":"2023-06-23T08:21:34","slug":"coeficiente-de-atrito-estatico-ou-coeficiente-de-atrito-estatico","status":"publish","type":"post","link":"https:\/\/physigeek.com\/pt\/coeficiente-de-atrito-estatico-ou-coeficiente-de-atrito-estatico\/","title":{"rendered":"Coeficiente de atrito est\u00e1tico (ou coeficiente de atrito est\u00e1tico)"},"content":{"rendered":"<p>Este artigo explica o que \u00e9 o coeficiente de atrito est\u00e1tico (ou coeficiente de atrito est\u00e1tico) em f\u00edsica e como ele \u00e9 calculado. Voc\u00ea encontrar\u00e1 portanto um exemplo concreto de c\u00e1lculo do coeficiente de atrito est\u00e1tico e, al\u00e9m disso, quais s\u00e3o as diferen\u00e7as com o coeficiente de atrito din\u00e2mico. <\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%C2%BFQue-es-el-coeficiente-de-friccion-estatico\"><\/span> Qual \u00e9 o coeficiente de atrito est\u00e1tico?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> O <strong>coeficiente de atrito est\u00e1tico<\/strong> , tamb\u00e9m chamado <strong>de coeficiente de atrito est\u00e1tico<\/strong> , \u00e9 um coeficiente que relaciona a for\u00e7a de atrito est\u00e1tico com a for\u00e7a normal.<\/p>\n<p> Simplificando, o coeficiente de atrito est\u00e1tico \u00e9 um coeficiente que indica o atrito entre as superf\u00edcies de dois corpos quando um pretende come\u00e7ar a deslizar sobre o outro (mas ainda est\u00e1 em repouso).<\/p>\n<p> O coeficiente de atrito est\u00e1tico \u00e9 adimensional, portanto n\u00e3o possui unidade.<\/p>\n<p> Da mesma forma, o coeficiente de atrito est\u00e1tico \u00e9 geralmente representado pelo s\u00edmbolo \u03bc <sub>e<\/sub> . <\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Como-calcular-el-coeficiente-de-friccion-estatico\"><\/span> Como calcular o coeficiente de atrito est\u00e1tico<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> O coeficiente de atrito est\u00e1tico \u00e9 igual \u00e0 raz\u00e3o entre a for\u00e7a de atrito est\u00e1tico (ou for\u00e7a de atrito) e a for\u00e7a normal. Portanto, o coeficiente de atrito est\u00e1tico \u00e9 calculado dividindo a for\u00e7a de atrito est\u00e1tico pela for\u00e7a normal.<\/p>\n<p> Resumindo, a <strong>f\u00f3rmula do coeficiente de atrito est\u00e1tico<\/strong> \u00e9:<\/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-568706ddaf0d45e662693d59fae2c27b_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\mu_e=\\cfrac{F_R}{N}\" title=\"Rendered by QuickLaTeX.com\" height=\"38\" width=\"66\" style=\"vertical-align: -12px;\"><\/p>\n<\/p>\n<p style=\"margin-bottom:5px\"> Ouro: <\/p>\n<ul style=\"color:#4fd12f; font-weight: bold;\">\n<li style=\"margin-bottom:8px\"><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-2e31866dcf024412ee93cebbefeaefed_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\mu_e\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"17\" style=\"vertical-align: -4px;\"><\/p>\n<p> \u00e9 o coeficiente de atrito est\u00e1tico, que n\u00e3o tem unidade. <\/span><\/li>\n<li style=\"margin-bottom:8px\"><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-5b005ac29604de5f2904d2da7ade0238_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"F_R\" title=\"Rendered by QuickLaTeX.com\" height=\"15\" width=\"22\" style=\"vertical-align: -3px;\"><\/p>\n<p> \u00e9 a for\u00e7a de atrito ou atrito est\u00e1tico, expressa em newtons.<\/span><\/li>\n<li><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-7354bae77b50b7d1faed3e8ea7a3511a_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"N\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"16\" style=\"vertical-align: 0px;\"><\/p>\n<p> \u00e9 a for\u00e7a normal, expressa em newtons.<\/span><\/li>\n<\/ul>\n<p> Por outro lado, quando o corpo a ser movido est\u00e1 sobre um <span style=\"text-decoration: underline;\">plano inclinado<\/span> , a for\u00e7a de atrito e a for\u00e7a normal equivalem \u00e0s seguintes express\u00f5es:<\/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-acd84f443a675eee12ededdb68512b2d_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"F_R=m\\cdot g\\cdot \\text{sin}(\\alpha)\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"143\" style=\"vertical-align: -5px;\"><\/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-3faf701ac1fd486c1362be307d74d145_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"N=m\\cdot g\\cdot \\text{cos}(\\alpha)\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"138\" style=\"vertical-align: -5px;\"><\/p>\n<\/p>\n<p> Ent\u00e3o, se substituirmos essas express\u00f5es na f\u00f3rmula, podemos obter uma equa\u00e7\u00e3o que relaciona o coeficiente de atrito est\u00e1tico com a inclina\u00e7\u00e3o do plano:<\/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-568706ddaf0d45e662693d59fae2c27b_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\mu_e=\\cfrac{F_R}{N}\" title=\"Rendered by QuickLaTeX.com\" height=\"38\" width=\"66\" 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-9a65be8d49858744d7088d0e7fa8e16d_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\mu_e=\\cfrac{m\\cdot g\\cdot \\text{sin}(\\alpha)}{m\\cdot g\\cdot \\text{cos}(\\alpha)}\" title=\"Rendered by QuickLaTeX.com\" height=\"45\" width=\"143\" style=\"vertical-align: -17px;\"><\/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-14796839a3329cdb5aa424a69b399224_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\mu_e=\\cfrac{\\text{sin}(\\alpha)}{\\text{cos}(\\alpha)}\" title=\"Rendered by QuickLaTeX.com\" height=\"45\" width=\"92\" style=\"vertical-align: -17px;\"><\/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-f3e2e0c815d7b64abc6c2dad0e83d51a_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\mu_e=\\text{tg}(\\alpha)\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"82\" style=\"vertical-align: -5px;\"><\/p>\n<\/p>\n<p> Resumindo, a <strong>f\u00f3rmula do coeficiente de atrito est\u00e1tico em um plano inclinado<\/strong> \u00e9 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-f3e2e0c815d7b64abc6c2dad0e83d51a_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\mu_e=\\text{tg}(\\alpha)\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"82\" style=\"vertical-align: -5px;\"><\/p>\n<\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Ejercicio-resuelto-del-coeficiente-de-friccion-estatico\"><\/span> Exerc\u00edcio resolvido sobre o coeficiente de atrito est\u00e1tico<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> Depois de vermos a defini\u00e7\u00e3o e a f\u00f3rmula do coeficiente de atrito est\u00e1tico (ou coeficiente de atrito est\u00e1tico), veremos um exerc\u00edcio resolvido para melhor compreender o conceito.<\/p>\n<ul>\n<li> O objetivo \u00e9 mover um bloco de massa m=12 kg sobre uma superf\u00edcie plana e, para isso, \u00e9 exercida uma for\u00e7a horizontal F=35 N, mas ele n\u00e3o consegue se mover. Qual \u00e9 o coeficiente de atrito est\u00e1tico entre o solo e o bloco? Dados: g=9,81 m\/ <sup>s2<\/sup> . <\/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\/probleme-resolu-coefficient-de-frottement-statique.png\" alt=\"problema resolvido de coeficiente de atrito est\u00e1tico\" class=\"wp-image-4302\" width=\"285\" height=\"125\" srcset=\"https:\/\/physigeek.com\/wp-content\/uploads\/2023\/09\/probleme-resolu-coefficient-de-frottement-statique-300x132.png 300w, https:\/\/physigeek.com\/wp-content\/uploads\/2023\/09\/probleme-resolu-coefficient-de-frottement-statique.png 650w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\"><\/figure>\n<p> Primeiro, representamos graficamente todas as for\u00e7as que atuam no bloco: <\/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\/exercice-resolu-force-de-friction-statique.png\" alt=\"exerc\u00edcio resolvido sobre o coeficiente de atrito est\u00e1tico ou coeficiente de atrito est\u00e1tico\" class=\"wp-image-4303\" width=\"269\" height=\"359\" srcset=\"https:\/\/physigeek.com\/wp-content\/uploads\/2023\/09\/exercice-resolu-force-de-friction-statique-225x300.png 225w, https:\/\/physigeek.com\/wp-content\/uploads\/2023\/09\/exercice-resolu-force-de-friction-statique.png 670w\" sizes=\"auto, (max-width: 225px) 100vw, 225px\"><\/figure>\n<p> Como o corpo permanece em equil\u00edbrio, as duas equa\u00e7\u00f5es a seguir s\u00e3o verdadeiras: <\/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-318d3aaff48777c13e5ac24cb775f6b0_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"N=P\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"54\" style=\"vertical-align: 0px;\"><\/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-b2d0fc9325264d9c3dceae21b529d2c5_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"F_R=F\" title=\"Rendered by QuickLaTeX.com\" height=\"15\" width=\"60\" style=\"vertical-align: -3px;\"><\/p>\n<\/p>\n<p> Assim a for\u00e7a de atrito ser\u00e1 equivalente \u00e0 for\u00e7a horizontal aplicada ao corpo:<\/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-cbfde4eeb825f6a30512f9903b23c0fd_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"F_R=F=35\\N\" title=\"Rendered by QuickLaTeX.com\" height=\"16\" width=\"101\" style=\"vertical-align: -3px;\"><\/p>\n<\/p>\n<p> Por outro lado, podemos calcular o valor da for\u00e7a normal usando a f\u00f3rmula da for\u00e7a peso:<\/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-4dfb5f5889745871fa0f92f8fa053408_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\begin{array}{l}N=P\\\\[3ex] N=m\\cdot g\\\\[3ex] N=12\\cdot 9,81 \\\\[3ex] N=117,72 \\ N \\end{array }\" title=\"Rendered by QuickLaTeX.com\" height=\"151\" width=\"114\" style=\"vertical-align: 0px;\"><\/p>\n<\/p>\n<p> Finalmente, uma vez conhecido o valor da for\u00e7a de atrito e da for\u00e7a normal, aplicamos a f\u00f3rmula do coeficiente de atrito est\u00e1tico para determinar o seu valor: <\/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-356fd4987f05195ea999321eedc620af_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\mu_e=\\cfrac{F_R}{N}=\\cfrac{35}{117.72}=0.30\" title=\"Rendered by QuickLaTeX.com\" height=\"39\" width=\"197\" style=\"vertical-align: -12px;\"><\/p>\n<\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Coeficiente-de-friccion-estatico-y-dinamico\"><\/span> Coeficiente de atrito est\u00e1tico e din\u00e2mico<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> Nesta se\u00e7\u00e3o veremos a diferen\u00e7a entre o coeficiente de atrito est\u00e1tico e o coeficiente de atrito din\u00e2mico, pois dependendo da situa\u00e7\u00e3o um ou outro deve ser utilizado.<\/p>\n<p> A <strong>diferen\u00e7a entre o coeficiente de atrito est\u00e1tico e din\u00e2mico<\/strong> \u00e9 que o coeficiente de atrito est\u00e1tico \u00e9 usado quando o corpo est\u00e1 em repouso, enquanto o coeficiente de atrito din\u00e2mico \u00e9 usado quando o corpo est\u00e1 em movimento.<\/p>\n<p> Portanto, dependendo se o corpo sobre o qual atua a for\u00e7a de atrito est\u00e1 estacion\u00e1rio ou deslizando sobre uma superf\u00edcie, \u00e9 necess\u00e1rio usar o coeficiente de atrito est\u00e1tico ou o coeficiente de atrito din\u00e2mico respectivamente para calcular a for\u00e7a de atrito.<\/p>\n<p> Em geral, o coeficiente de atrito est\u00e1tico \u00e9 maior que o coeficiente de atrito din\u00e2mico.<\/p>\n<p> Para saber mais sobre este tipo de coeficiente de atrito, clique no link a seguir: <\/p>\n<div style=\"background-color:#FFFDE7; padding-top: 10px; padding-bottom: 10px; padding-right: 10px; padding-left: 20px; border: 2.5px dashed #FFB74D; border-radius:20px;\"> <span style=\"color:#ff951b\">\u27a4<\/span> <strong>Veja:<\/strong> <a href=\"https:\/\/physigeek.com\/pt\/coeficiente-de-atrito-dinamico\/\">coeficiente de atrito din\u00e2mico<\/a> <\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Valores-del-coeficiente-de-friccion-estatico\"><\/span> Valores do coeficiente de atrito est\u00e1tico<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p> Por fim, deixamos a seguinte tabela na qual voc\u00ea pode ver alguns valores comuns do coeficiente de atrito est\u00e1tico e do coeficiente de atrito din\u00e2mico:<\/p>\n<figure class=\"wp-block-table is-style-stripes\">\n<table>\n<thead>\n<tr>\n<th> Superf\u00edcies de contato<\/th>\n<th class=\"has-text-align-center\" data-align=\"center\"> Coeficiente de atrito est\u00e1tico (\u03bc <sub>e<\/sub> )<\/th>\n<th class=\"has-text-align-center\" data-align=\"center\"> Coeficiente de atrito din\u00e2mico ( <sub>\u03bcd<\/sub> )<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td> Cobre em a\u00e7o<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\"> 0,53<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\"> 0,36<\/td>\n<\/tr>\n<tr>\n<td> A\u00e7o sobre a\u00e7o<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\"> 0,74<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\"> 0,57<\/td>\n<\/tr>\n<tr>\n<td> Alum\u00ednio sobre a\u00e7o<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\"> 0,61<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\"> 0,47<\/td>\n<\/tr>\n<tr>\n<td> Borracha sobre cimento<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\"> 1<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\"> 0,8<\/td>\n<\/tr>\n<tr>\n<td> Madeira sobre madeira<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\"> 0,25-0,5<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\"> 0,2<\/td>\n<\/tr>\n<tr>\n<td> Madeira em couro<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\"> 0,5<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\"> 0,4<\/td>\n<\/tr>\n<tr>\n<td> Teflon em Teflon<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\"> 0,04<\/td>\n<td class=\"has-text-align-center\" data-align=\"center\"> 0,04<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/figure>\n<p> Tenha em mente que esses valores podem variar, pois dependem de muitos fatores, como rugosidade da superf\u00edcie, temperatura, etc.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Este artigo explica o que \u00e9 o coeficiente de atrito est\u00e1tico (ou coeficiente de atrito est\u00e1tico) em f\u00edsica e como ele \u00e9 calculado. Voc\u00ea encontrar\u00e1 portanto um exemplo concreto de c\u00e1lculo do coeficiente de atrito est\u00e1tico e, al\u00e9m disso, quais s\u00e3o as diferen\u00e7as com o coeficiente de atrito din\u00e2mico. Qual \u00e9 o coeficiente de atrito &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"https:\/\/physigeek.com\/pt\/coeficiente-de-atrito-estatico-ou-coeficiente-de-atrito-estatico\/\"> <span class=\"screen-reader-text\">Coeficiente de atrito est\u00e1tico (ou coeficiente de atrito est\u00e1tico)<\/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-249","post","type-post","status-publish","format-standard","hentry","category-dinamico"],"yoast_head":"<!-- This site is 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