{"id":424,"date":"2026-10-03T19:10:57","date_gmt":"2026-10-03T18:10:57","guid":{"rendered":"https:\/\/wpcalc.com\/pt\/lei-de-hooke\/"},"modified":"2026-10-03T19:10:57","modified_gmt":"2026-10-03T18:10:57","slug":"lei-de-hooke","status":"publish","type":"post","link":"https:\/\/wpcalc.com\/pt\/fisica\/lei-de-hooke\/","title":{"rendered":"Calculadora da Lei de Hooke"},"content":{"rendered":"<section class=\"not-prose calculator-box\" aria-labelledby=\"calculator-title\"><div class=\"flex items-baseline sm:items-center justify-between gap-2 sm:gap-3\"><div class=\"flex flex-col sm:flex-row sm:items-center gap-2\"><span class=\"icon icon-calculator text-primary-700! text-base! dark:text-primary-300!\" aria-hidden=\"true\"><\/span><h2 id=\"calculator-title\" class=\"text-lg font-display font-bold\">Calcular for\u00e7a el\u00e1stica, constante el\u00e1stica ou deforma\u00e7\u00e3o<\/h2><\/div><div class=\"calcdash-favorite group\">\n  <button type=\"button\" class=\"favorite\" id=\"favorite\" data-favorite-id=\"424\" data-favorite-title=\"Lei de Hooke\" data-favorite-url=\"https:\/\/wpcalc.com\/pt\/fisica\/lei-de-hooke\/\" data-favorite-excerpt=\"Calcule a for\u00e7a da mola, a constante el\u00e1stica ou a deforma\u00e7\u00e3o usando a lei de Hooke (F = k\u00b7x). Introduza as duas grandezas conhecidas, escolha as unidades e obtenha instantaneamente o terceiro valor.\" aria-label=\"Adicionar aos favoritos\" data-favorite-icon=\"icon icon-physic\">\n    <span class=\"icon icon-shape-star-empty\" aria-hidden=\"true\"><\/span>\n  <\/button>\n  <div class=\"calcdash-favorite__tip\" aria-hidden=\"true\">\n   <span class=\"favorite-tooltip\" id=\"favorite-tooltip\"><\/span>\n  <\/div>\n  <span class=\"sr-only\" role=\"status\" id=\"favorite-status\"><\/span>\n<\/div><\/div><form action=\"https:\/\/wpcalc.com\/pt\/fisica\/lei-de-hooke\/\" method=\"POST\" class=\"calculator\" id=\"calculator-424\" data-post=\"424\"><fieldset class=\"fieldset-input is-1\"><legend class=\"sr-only\">Campos de entrada<\/legend><div class=\"field is-single\" id=\"input-1\"><label for=\"field-1\">Calcular<\/label><div class=\"grid grid-cols-1\"><select id=\"field-1\" name=\"calcular\"><option value=\"force\" selected>For\u00e7a el\u00e1stica (F)<\/option><option value=\"constant\">Constante el\u00e1stica (k)<\/option><option value=\"displacement\">Extens\u00e3o \/ compress\u00e3o (x)<\/option><\/select><svg class=\"pointer-events-none col-start-1 row-start-1 mr-2 size-5 self-center justify-self-end text-gray-500 sm:size-4\" viewBox=\"0 0 16 16\" fill=\"currentColor\" aria-hidden=\"true\" data-slot=\"icon\">\n              <path fill-rule=\"evenodd\" d=\"M4.22 6.22a.75.75 0 0 1 1.06 0L8 8.94l2.72-2.72a.75.75 0 1 1 1.06 1.06l-3.25 3.25a.75.75 0 0 1-1.06 0L4.22 7.28a.75.75 0 0 1 0-1.06Z\" clip-rule=\"evenodd\" \/>\n            <\/svg><\/div><\/div><div class=\"field is-single has-term\" id=\"input-2\" hidden><label for=\"field-2\">For\u00e7a el\u00e1stica (F)<\/label><div class=\"term\">F<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><div class=\"field-group\"><input type=\"number\" name=\"fora_elstica_f\" id=\"field-2\" aria-describedby=\"calc-info-2\" placeholder=\"e.g. 50\" step=\"any\" value=\"50\"\/><div class=\"grid grid-cols-1\"><select id=\"field-3\" name=\"unidade\" aria-label=\"Unidade\"><option value=\"N\" selected>N<\/option><option value=\"lbf\">lbf<\/option><option value=\"kgf\">kgf<\/option><\/select><svg class=\"pointer-events-none col-start-1 row-start-1 mr-2 size-5 self-center justify-self-end text-gray-500 sm:size-4\" viewBox=\"0 0 16 16\" fill=\"currentColor\" aria-hidden=\"true\" data-slot=\"icon\">\n              <path fill-rule=\"evenodd\" d=\"M4.22 6.22a.75.75 0 0 1 1.06 0L8 8.94l2.72-2.72a.75.75 0 1 1 1.06 1.06l-3.25 3.25a.75.75 0 0 1-1.06 0L4.22 7.28a.75.75 0 0 1 0-1.06Z\" clip-rule=\"evenodd\" \/>\n            <\/svg><\/div><\/div><small id=\"calc-info-2\">Valor positivo estica a mola, valor negativo a comprime.<\/small><\/div><div class=\"field is-single has-term\" id=\"input-3\"><label for=\"field-4\">Constante el\u00e1stica (k)<\/label><div class=\"term\">k<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><div class=\"field-group\"><input type=\"text\" name=\"constante_elstica_k\" id=\"field-4\" aria-describedby=\"calc-info-4\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" placeholder=\"e.g. 250\" min=\"0\" value=\"250\"\/><div class=\"grid grid-cols-1\"><select id=\"field-5\" name=\"unidade\" aria-label=\"Unidade\"><option value=\"N\/m\" selected>N\/m<\/option><option value=\"N\/cm\">N\/cm<\/option><option value=\"lbf\/in\">lbf\/in<\/option><option value=\"lbf\/ft\">lbf\/ft<\/option><\/select><svg class=\"pointer-events-none col-start-1 row-start-1 mr-2 size-5 self-center justify-self-end text-gray-500 sm:size-4\" viewBox=\"0 0 16 16\" fill=\"currentColor\" aria-hidden=\"true\" data-slot=\"icon\">\n              <path fill-rule=\"evenodd\" d=\"M4.22 6.22a.75.75 0 0 1 1.06 0L8 8.94l2.72-2.72a.75.75 0 1 1 1.06 1.06l-3.25 3.25a.75.75 0 0 1-1.06 0L4.22 7.28a.75.75 0 0 1 0-1.06Z\" clip-rule=\"evenodd\" \/>\n            <\/svg><\/div><\/div><small id=\"calc-info-4\">Rigidez da mola.<\/small><\/div><div class=\"field is-single has-term\" id=\"input-4\"><label for=\"field-6\">Deforma\u00e7\u00e3o (x)<\/label><div class=\"term\">x<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><div class=\"field-group\"><input type=\"number\" name=\"deformao_x\" id=\"field-6\" aria-describedby=\"calc-info-6\" placeholder=\"e.g. 0.2\" step=\"any\" value=\"0.2\"\/><div class=\"grid grid-cols-1\"><select id=\"field-7\" name=\"unidade\" aria-label=\"Unidade\"><option value=\"m\" selected>m<\/option><option value=\"cm\">cm<\/option><option value=\"mm\">mm<\/option><option value=\"ft\">ft<\/option><option value=\"in\">in<\/option><\/select><svg class=\"pointer-events-none col-start-1 row-start-1 mr-2 size-5 self-center justify-self-end text-gray-500 sm:size-4\" viewBox=\"0 0 16 16\" fill=\"currentColor\" aria-hidden=\"true\" data-slot=\"icon\">\n              <path fill-rule=\"evenodd\" d=\"M4.22 6.22a.75.75 0 0 1 1.06 0L8 8.94l2.72-2.72a.75.75 0 1 1 1.06 1.06l-3.25 3.25a.75.75 0 0 1-1.06 0L4.22 7.28a.75.75 0 0 1 0-1.06Z\" clip-rule=\"evenodd\" \/>\n            <\/svg><\/div><\/div><small id=\"calc-info-6\">Positivo = extens\u00e3o, negativo = compress\u00e3o.<\/small><\/div><\/fieldset><div class=\"buttons\"><button type=\"submit\" data-text=\"Recalcular\" id=\"calculate-button\" data-post=\"424\">Calcular<\/button><button type=\"reset\">Redefinir<\/button><\/div><div class=\"field is-checkbox hidden!\" id=\"field-auto-calc\"><input type=\"checkbox\" id=\"auto-calc\"><label for=\"auto-calc\">Calcular automaticamente<\/label><small>Se ativado, o resultado \u00e9 atualizado automaticamente quando voc\u00ea altera qualquer valor.<\/small><\/div><div class=\"fieldset-result is-hidden\" aria-labelledby=\"result-title\" aria-live=\"polite\" role=\"region\"> <h3 class=\"result-title bg-gradient-to-r from-primary-50 to-gray-50 dark:from-primary-900 dark:to-gray-800\" id=\"result-title\"><span class=\"icon icon-s-pulse\" aria-hidden=\"true\"><\/span> Resultados da Lei de Hooke<\/h3><div class=\"result-box\"><div class=\"field-result is-column\" id=\"output-1\"><span class=\"field-title\"><span>Grandeza calculada<\/span><\/span><span class=\"field-value\" id=\"result-1\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copiar resultado\" aria-label=\"Copiar resultado\"><span class=\"copy-icon icon icon-document-copy\" aria-hidden=\"true\"><\/span><\/button><\/div><div class=\"field-result is-column\" id=\"output-2\"><span class=\"field-title\"><span>Todas as grandezas deste c\u00e1lculo<\/span><\/span><span class=\"field-value\" id=\"result-2\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copiar resultado\" aria-label=\"Copiar resultado\"><span class=\"copy-icon icon icon-document-copy\" aria-hidden=\"true\"><\/span><\/button><\/div><\/div><div class=\"result-actions\"><button type=\"button\" class=\"copy-link\"><svg viewBox=\"0 0 20 20\" fill=\"currentColor\" aria-hidden=\"true\"><path d=\"M12.232 4.232a2.5 2.5 0 0 1 3.536 3.536l-1.225 1.224a.75.75 0 0 0 1.061 1.06l1.224-1.224a4 4 0 0 0-5.656-5.656l-3 3a4 4 0 0 0 .225 5.865.75.75 0 0 0 .977-1.138 2.5 2.5 0 0 1-.142-3.667l3-3Z\"\/><path d=\"M11.603 7.963a.75.75 0 0 0-.977 1.138 2.5 2.5 0 0 1 .142 3.667l-3 3a2.5 2.5 0 0 1-3.536-3.536l1.225-1.224a.75.75 0 0 0-1.061-1.06l-1.224 1.224a4 4 0 1 0 5.656 5.656l3-3a4 4 0 0 0-.225-5.865Z\"\/><\/svg><span class=\"copy-link__text\">Copiar link para este c\u00e1lculo<\/span><\/button><span class=\"sr-only\" role=\"status\" id=\"copy-link-status\"><\/span><\/div><\/div><a href=\"#respond\" class=\"hidden transition-opacity duration-300 opacity-0 w-50 text-sm justify-center items-center gap-2 px-4 py-2 rounded bg-gray-200 text-gray-700 hover:bg-gray-300\" id=\"leave-comment\"><span class=\"icon icon-comments\" aria-hidden=\"true\"><\/span>Deixar um coment\u00e1rio<\/a><\/form><\/section><section id=\"calc-reactions\" class=\"not-prose hidden my-12 bg-gradient-to-r from-primary-50 to-gray-50 border border-indigo-100 rounded-xl px-6 py-4 shadow-sm\" data-post=\"424\" aria-live=\"polite\" aria-labelledby=\"calc-reactions-title\"><p id=\"calc-reactions-title\" class=\"text-sm text-gray-500 text-center mb-2\">O que voc\u00ea achou deste resultado?<\/p><div role=\"group\" aria-labelledby=\"calc-reactions-title\" class=\"grid grid-cols-3 sm:flex sm:flex-row sm:justify-around gap-4 sm:items-center sm:flex-wrap\"><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"like\"><span class=\"reaction-count\" data-reaction-count=\"like\">0<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\ud83d\ude00 <\/span><span class=\"reaction-description font-medium\">Curti <\/span><\/button><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"helpful\"><span class=\"reaction-count\" data-reaction-count=\"helpful\">0<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\ud83d\udca1 <\/span><span class=\"reaction-description font-medium\">\u00datil <\/span><\/button><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"confused\"><span class=\"reaction-count\" data-reaction-count=\"confused\">0<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\ud83d\ude15 <\/span><span class=\"reaction-description font-medium\">Confuso <\/span><\/button><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"disappointed\"><span class=\"reaction-count\" data-reaction-count=\"disappointed\">0<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\ud83d\ude1e <\/span><span class=\"reaction-description font-medium\">Decepcionado <\/span><\/button><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"inaccurate\"><span class=\"reaction-count\" data-reaction-count=\"inaccurate\">0<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\u274c <\/span><span class=\"reaction-description font-medium\">Impreciso <\/span><\/button><\/div><div id=\"reaction-message\" class=\"hidden mt-8 rounded-md border border-primary-100 bg-white\/50 backdrop-blur-sm px-4 py-2 text-sm text-center shadow-sm\"><\/div><\/section><div class=\"calcdash-ad not-prose calcdash-ad--calc_result calcdash-ad--in-article\"><ins class=\"adsbygoogle\" style=\"display:block\" data-ad-client=\"ca-pub-1721569815777345\" data-ad-slot=\"6317458308\" data-ad-layout=\"in-article\" data-ad-format=\"fluid\"><\/ins><script>(adsbygoogle = window.adsbygoogle || []).push({});<\/script><\/div>\n<style id=\"wpcoderpro-inline-1\">.formula-box {\r\n\tborder-bottom: none !important;\r\n}<\/style><section class=\"formula-box\" aria-labelledby=\"formula-title\">\r\n\t<div id=\"formula-title\" class=\"not-prose font-display mb-4\"><span class=\"icon icon-formula\" aria-hidden=\"true\"><\/span><h2>F\u00f3rmula da Lei de Hooke<\/h2><\/div>\r\n\t<figure class=\"not-prose formula\">\r\n\t\t<figcaption class=\"formula-title\">F\u00f3rmula<\/figcaption>\r\n\t\t<div class=\"text-base text-gray-800\" id=\"formula\">\n\\[ F = k \\cdot x \\]\n<\/div>\r\n\t<\/figure>\r\n\t<\/p>\n<p><strong>Onde:<\/strong><\/p>\n<ul>\n<li>\\(F\\) \u2014 for\u00e7a da mola exercida pela (ou aplicada \u00e0) mola, em newtons (N)<\/li>\n<li>\\(k\\) \u2014 constante el\u00e1stica (rigidez), em newtons por metro (N\/m)<\/li>\n<li>\\(x\\) \u2014 deforma\u00e7\u00e3o em rela\u00e7\u00e3o ao comprimento natural, em metros (m); positiva no alongamento, negativa na compress\u00e3o<\/li>\n<\/ul>\n<p>A f\u00f3rmula estabelece que a for\u00e7a exercida por uma mola \u00e9 diretamente proporcional ao quanto ela \u00e9 esticada ou comprimida a partir do seu comprimento natural. As formas rearranjadas permitem calcular qualquer uma das tr\u00eas grandezas: \\( k = F\/x \\) e \\( x = F\/k \\).<\/p>\n<p>\r\n<\/section>\n<style id=\"wpcoderpro-inline-2\">.calculation-box {\r\n\tborder-bottom: none !important;\r\n}<\/style><section id=\"calculation\" class=\"calculation-box\" aria-labelledby=\"calculation-title\">\r\n\t<div id=\"calculation-title\" class=\"not-prose font-display\"><span class=\"icon icon-unordered-list\" aria-hidden=\"true\"><\/span><h2>Lei de Hooke \u2013 Exemplo de C\u00e1lculo<\/h2><\/div>\r\n\r\n<\/p>\n<p><strong>Exemplo:<\/strong> uma mola com rigidez de 250 N\/m \u00e9 esticada 0,2 m al\u00e9m do seu comprimento natural. Qual \u00e9 a for\u00e7a que ela exerce?<\/p>\n<p>\\[ F = k \\cdot x = 250 \\, \\text{N\/m} \\times 0.2 \\, \\text{m} \\]<\/p>\n<p>\\[ F = 50 \\, \\text{N} \\]<\/p>\n<p><strong>Resultado:<\/strong> a mola exerce uma for\u00e7a restauradora de 50 N (cerca de 11,24 lbf), puxando-a de volta em dire\u00e7\u00e3o ao seu comprimento natural.<\/p>\n<p>\n\r\n<\/section>\n<h2>Como usar a calculadora da lei de Hooke<\/h2>\n<ol>\n<li>No menu suspenso <strong>Calcular<\/strong>, escolha a grandeza que deseja determinar: <strong>For\u00e7a da mola (F)<\/strong>, <strong>Constante el\u00e1stica (k)<\/strong> ou <strong>Alongamento \/ compress\u00e3o (x)<\/strong>. A calculadora oculta o campo correspondente \u00e0 grandeza que est\u00e1 calculando.<\/li>\n<li>Introduza os dois valores conhecidos nos campos restantes: <strong>For\u00e7a da mola (F)<\/strong>, <strong>Constante el\u00e1stica (k)<\/strong> e <strong>Deforma\u00e7\u00e3o (x)<\/strong>.<\/li>\n<li>Escolha a unidade de cada entrada no menu suspenso ao lado \u2014 for\u00e7a em N, lbf ou kgf; rigidez em N\/m, N\/cm, lbf\/in ou lbf\/ft; deforma\u00e7\u00e3o em m, cm, mm, ft ou in.<\/li>\n<li>Leia o resultado: a grandeza calculada \u00e9 mostrada na unidade escolhida, com alternativas comuns, e uma tabela lista as tr\u00eas grandezas (for\u00e7a, rigidez, deforma\u00e7\u00e3o) com as suas dire\u00e7\u00f5es.<\/li>\n<\/ol>\n<h2>O que \u00e9 a lei de Hooke?<\/h2>\n<p>A lei de Hooke, formulada por Robert Hooke em 1676, descreve o comportamento de uma mola el\u00e1stica ideal: a for\u00e7a necess\u00e1ria para esticar ou comprimir uma mola \u00e9 diretamente proporcional \u00e0 dist\u00e2ncia da deforma\u00e7\u00e3o. Dobre o alongamento e precisar\u00e1 do dobro da for\u00e7a. Esta rela\u00e7\u00e3o linear \u00e9 v\u00e1lida para a maioria das molas, el\u00e1sticos e muitos materiais el\u00e1sticos \u2014 desde que se permane\u00e7a dentro do <em>limite el\u00e1stico<\/em>.<\/p>\n<p>A constante de proporcionalidade \\(k\\), chamada constante el\u00e1stica ou rigidez, indica o quanto uma mola resiste \u00e0 deforma\u00e7\u00e3o. Uma mola r\u00edgida de suspens\u00e3o de carro pode ter \\(k\\) na ordem de dezenas de milhares de N\/m, enquanto uma mola macia de brinquedo pode ter apenas alguns N\/m. \u00c9 importante notar que \\(k\\) depende do material, do di\u00e2metro das espiras, da espessura do fio e do n\u00famero de espiras \u2014 \u00e9 uma propriedade espec\u00edfica da mola, e n\u00e3o apenas do material.<\/p>\n<p>Note que a for\u00e7a na lei de Hooke \u00e9 uma for\u00e7a <em>restauradora<\/em>: ela sempre aponta no sentido oposto \u00e0 deforma\u00e7\u00e3o. Nesta calculadora, uma deforma\u00e7\u00e3o positiva significa que a mola est\u00e1 esticada, e a for\u00e7a positiva resultante \u00e9 o m\u00f3dulo da for\u00e7a restauradora. Se introduzir uma deforma\u00e7\u00e3o negativa (compress\u00e3o), a for\u00e7a ser\u00e1 negativa, indicando que a mola empurra para fora. Se quiser explorar a energia armazenada numa mola deformada, consulte a <a href=\"https:\/\/wpcalc.com\/pt\/fisica\/calculadora-energia-potencial-elastica\/\">calculadora de energia potencial el\u00e1stica<\/a>; para for\u00e7a em geral, experimente a <a href=\"https:\/\/wpcalc.com\/pt\/fisica\/forca-fisica\/\">calculadora de for\u00e7a<\/a>.<\/p>\n<p>Como a f\u00f3rmula \u00e9 uma simples propor\u00e7\u00e3o, pode us\u00e1-la em qualquer sistema de unidades coerente. A calculadora converte as suas entradas para unidades SI internamente, portanto misturar, por exemplo, lbf com polegadas funciona corretamente \u2014 sem necessidade de convers\u00f5es manuais.<\/p>\n<h2>Calcular cada vari\u00e1vel<\/h2>\n<ul>\n<li><strong>Encontrar a for\u00e7a:<\/strong> \\( F = k \\cdot x \\). Multiplique a rigidez pela deforma\u00e7\u00e3o. \u00c9 o caso em que se conhece a mola e a dist\u00e2ncia da sua deforma\u00e7\u00e3o.<\/li>\n<li><strong>Encontrar a constante el\u00e1stica:<\/strong> \\( k = F \/ x \\). Divida a for\u00e7a aplicada pela deforma\u00e7\u00e3o resultante. \u00c9 uma forma comum de medir experimentalmente a rigidez de uma mola desconhecida: pendure um peso conhecido e me\u00e7a o quanto ela se estica.<\/li>\n<li><strong>Encontrar a deforma\u00e7\u00e3o:<\/strong> \\( x = F \/ k \\). Divida a for\u00e7a pela rigidez. Isto indica o quanto uma mola se deformar\u00e1 sob uma determinada carga.<\/li>\n<\/ul>\n<h2>Hip\u00f3teses, limita\u00e7\u00f5es e dicas pr\u00e1ticas<\/h2>\n<ul>\n<li><strong>Limite el\u00e1stico:<\/strong> a lei de Hooke s\u00f3 funciona enquanto a deforma\u00e7\u00e3o for revers\u00edvel. Estique demasiado uma mola e ela deforma-se permanentemente; a rela\u00e7\u00e3o deixa de ser linear bem antes desse ponto.<\/li>\n<li><strong>Mola ideal e sem massa:<\/strong> o modelo ignora o pr\u00f3prio peso da mola e o atrito interno (histerese). As molas reais dissipam um pouco de energia em cada ciclo.<\/li>\n<li><strong>Conven\u00e7\u00f5es de sinal:<\/strong> introduza valores positivos para alongamento e negativos para compress\u00e3o. Ao calcular \\(k\\), a for\u00e7a e a deforma\u00e7\u00e3o devem ter o mesmo sinal \u2014 uma for\u00e7a de tra\u00e7\u00e3o com uma deforma\u00e7\u00e3o negativa implicaria uma constante el\u00e1stica negativa, fisicamente imposs\u00edvel, e a calculadora o avisar\u00e1.<\/li>\n<li><strong>Entradas nulas:<\/strong> uma for\u00e7a ou deforma\u00e7\u00e3o de zero n\u00e3o permite determinar \\(k\\) (qualquer rigidez produz deforma\u00e7\u00e3o nula sob carga nula), e a constante el\u00e1stica deve ser maior que zero.<\/li>\n<li><strong>Medir k na pr\u00e1tica:<\/strong> ao testar uma mola real, tome v\u00e1rios pares for\u00e7a\u2013deforma\u00e7\u00e3o e verifique se a raz\u00e3o \\(F\/x\\) \u00e9 constante \u2014 se ela variar, a mola est\u00e1 saindo da sua faixa linear.<\/li>\n<\/ul>\n<h2>Constantes el\u00e1sticas t\u00edpicas<\/h2>\n<table>\n<thead>\n<tr>\n<th>Mola \/ sistema<\/th>\n<th>k aproximado<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Mola de caneta esferogr\u00e1fica<\/td>\n<td>~50\u2013200 N\/m<\/td>\n<\/tr>\n<tr>\n<td>Mola de suspens\u00e3o de carro<\/td>\n<td>~20.000\u2013100.000 N\/m<\/td>\n<\/tr>\n<tr>\n<td>El\u00e1stico pequeno<\/td>\n<td>~10\u2013100 N\/m<\/td>\n<\/tr>\n<tr>\n<td>Espiral de colch\u00e3o<\/td>\n<td>~2.000\u201310.000 N\/m<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>A lei de Hooke tamb\u00e9m est\u00e1 na base dos problemas de oscila\u00e7\u00e3o: uma massa numa mola troca energia cin\u00e9tica por <a href=\"https:\/\/wpcalc.com\/en\/physics\/elastic-potential-energy\/\">energia potencial el\u00e1stica<\/a>, um caso que pode analisar com a <a href=\"https:\/\/wpcalc.com\/pt\/fisica\/calculadora-conservacao-de-energia\/\">calculadora de conserva\u00e7\u00e3o de energia<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Calcule a for\u00e7a da mola, a constante el\u00e1stica ou a deforma\u00e7\u00e3o usando a lei de Hooke (F = k\u00b7x). Introduza as duas grandezas conhecidas, escolha as unidades e obtenha instantaneamente o terceiro valor.<\/p>\n","protected":false},"author":3168,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[10],"tags":[55],"class_list":["post-424","post","type-post","status-publish","format-standard","hentry","category-fisica","tag-mecanica"],"acf":[],"_links":{"self":[{"href":"https:\/\/wpcalc.com\/pt\/wp-json\/wp\/v2\/posts\/424","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wpcalc.com\/pt\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/wpcalc.com\/pt\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/wpcalc.com\/pt\/wp-json\/wp\/v2\/users\/3168"}],"replies":[{"embeddable":true,"href":"https:\/\/wpcalc.com\/pt\/wp-json\/wp\/v2\/comments?post=424"}],"version-history":[{"count":4,"href":"https:\/\/wpcalc.com\/pt\/wp-json\/wp\/v2\/posts\/424\/revisions"}],"predecessor-version":[{"id":2612,"href":"https:\/\/wpcalc.com\/pt\/wp-json\/wp\/v2\/posts\/424\/revisions\/2612"}],"wp:attachment":[{"href":"https:\/\/wpcalc.com\/pt\/wp-json\/wp\/v2\/media?parent=424"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wpcalc.com\/pt\/wp-json\/wp\/v2\/categories?post=424"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wpcalc.com\/pt\/wp-json\/wp\/v2\/tags?post=424"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}