{"id":49398,"date":"2019-11-17T22:36:01","date_gmt":"2019-11-17T21:36:01","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/o-que-e-energia-mecanica-definicao\/"},"modified":"2020-01-29T12:28:42","modified_gmt":"2020-01-29T11:28:42","slug":"o-que-e-energia-mecanica-definicao","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-energia-mecanica-definicao\/","title":{"rendered":"O que \u00e9 energia mec\u00e2nica &#8211; defini\u00e7\u00e3o"},"content":{"rendered":"<div class=\"su-quote su-quote-style-default\">\n<div class=\"su-quote-inner su-clearfix\">Na f\u00edsica, energia mec\u00e2nica (Emech) \u00e9 a energia associada ao movimento e posi\u00e7\u00e3o de um objeto geralmente em algum campo de for\u00e7a (por exemplo, campo gravitacional).\u00a0Engenharia T\u00e9rmica<\/div>\n<\/div>\n<div class=\"su-divider su-divider-style-dotted\"><\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-100 lgc-tablet-grid-100 lgc-mobile-grid-100 lgc-equal-heights lgc-first lgc-last\">\n<div class=\"inside-grid-column\">\n<div class=\"su-spacer\"><\/div>\n<h2>O que \u00e9 energia mec\u00e2nica<\/h2>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/conservartion-of-mechanical-energy-pendulum.png\"><img loading=\"lazy\" class=\"alignright size-full wp-image-15713 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/conservartion-of-mechanical-energy-pendulum.png\" alt=\"conserva\u00e7\u00e3o do p\u00eandulo de energia mec\u00e2nica\" width=\"282\" height=\"214\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/conservartion-of-mechanical-energy-pendulum.png\" \/><\/a>Na f\u00edsica,\u00a0<strong>energia mec\u00e2nica<\/strong>\u00a0(E\u00a0<sub>mech<\/sub>\u00a0) \u00e9 a energia associada ao\u00a0<strong>movimento<\/strong>\u00a0e\u00a0<strong>posi\u00e7\u00e3o<\/strong>\u00a0de um objeto geralmente em algum campo de for\u00e7a (por exemplo, campo gravitacional).\u00a0<strong>A energia mec\u00e2nica<\/strong>\u00a0(e tamb\u00e9m a energia t\u00e9rmica) pode ser separada em duas categorias, transit\u00f3ria e armazenada.\u00a0Energia transit\u00f3ria \u00e9 energia em movimento, isto \u00e9, energia sendo transferida de um lugar para outro.\u00a0Energia armazenada \u00e9 a energia contida em uma subst\u00e2ncia ou objeto.\u00a0A energia mec\u00e2nica transit\u00f3ria \u00e9 comumente referida como\u00a0<strong>trabalho<\/strong>\u00a0.\u00a0A energia mec\u00e2nica armazenada existe em uma de duas formas:\u00a0<strong>cin\u00e9tica<\/strong>\u00a0ou\u00a0<strong>potencial<\/strong>\u00a0:<\/p>\n<ul>\n<li><strong>Energia potencial<\/strong>\u00a0.\u00a0Energia potencial, U, \u00e9 definida como a energia armazenada em um objeto sujeito a uma for\u00e7a conservadora.\u00a0Tipos comuns incluem a energia potencial gravitacional de um objeto que depende de sua massa e sua dist\u00e2ncia do centro de massa de outro objeto.<\/li>\n<li><strong>Energia cin\u00e9tica<\/strong>\u00a0.\u00a0A energia cin\u00e9tica,\u00a0<em>K<\/em>\u00a0, \u00e9 definida como a energia armazenada em um objeto por causa de seu movimento.\u00a0Depende da velocidade de um objeto e \u00e9 a capacidade de um objeto em movimento de trabalhar em outros objetos quando colide com eles.<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-100 lgc-tablet-grid-100 lgc-mobile-grid-100 lgc-equal-heights lgc-first lgc-last\">\n<div class=\"inside-grid-column\">\n<div class=\"su-spacer\"><\/div>\n<h2>Conserva\u00e7\u00e3o de Energia Mec\u00e2nica<\/h2>\n<p>Primeiro, o princ\u00edpio da\u00a0<strong>Conserva\u00e7\u00e3o de Energia Mec\u00e2nica<\/strong>\u00a0foi declarado:<\/p>\n<p><em><strong>A energia mec\u00e2nica total<\/strong>\u00a0(definida como a soma de seu potencial e energias cin\u00e9ticas) de uma part\u00edcula sendo acionada apenas por for\u00e7as conservadoras\u00a0<strong>\u00e9 constante<\/strong>\u00a0.<\/em><\/p>\n<p><strong><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/conservartion-of-mechanical-energy-example.png\"><img loading=\"lazy\" class=\"alignright size-full wp-image-15711 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/conservartion-of-mechanical-energy-example.png\" alt=\"exemplo de conserva\u00e7\u00e3o-de-energia-mec\u00e2nica\" width=\"194\" height=\"172\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/conservartion-of-mechanical-energy-example.png\" \/><\/a><\/strong><\/p>\n<p>Veja tamb\u00e9m:\u00a0<a title=\"Conserva\u00e7\u00e3o de Energia Mec\u00e2nica\" href=\"https:\/\/www.nuclear-power.com\/laws-of-conservation\/law-of-conservation-of-energy\/conservation-of-mechanical-energy\/\">Conserva\u00e7\u00e3o de energia mec\u00e2nica<\/a><\/p>\n<p><strong>Um sistema isolado<\/strong>\u00a0\u00e9 aquele em que\u00a0<strong>nenhuma for\u00e7a externa<\/strong>\u00a0causa mudan\u00e7as de energia.\u00a0Se apenas\u00a0<strong>for\u00e7as conservadoras<\/strong>\u00a0atuam em um objeto e\u00a0<strong>U<\/strong>\u00a0\u00e9 a\u00a0fun\u00e7\u00e3o\u00a0<strong>potencial de energia<\/strong>\u00a0para a for\u00e7a conservadora total, ent\u00e3o<\/p>\n<p><em><strong>E\u00a0<\/strong><strong><sub>mech<\/sub><\/strong><strong>\u00a0= U + K<\/strong><\/em><\/p>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-100 lgc-tablet-grid-100 lgc-mobile-grid-100 lgc-equal-heights  lgc-first lgc-last\">\n<div class=\"inside-grid-column\">\n<p><strong><span>A energia potencial,\u00a0<\/span><em><span>U<\/span><\/em><\/strong><span>\u00a0, depende da posi\u00e7\u00e3o de um objeto sujeito a uma for\u00e7a conservadora.<\/span><\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/potential-energy-equation.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-15710 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/potential-energy-equation.png\" alt=\"equa\u00e7\u00e3o de energia potencial\" width=\"176\" height=\"71\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/potential-energy-equation.png\" \/><\/a><\/p>\n<p><span>\u00c9 definida como a capacidade do objeto de fazer o trabalho e \u00e9 aumentada \u00e0 medida que o objeto \u00e9 movido na dire\u00e7\u00e3o oposta \u00e0 dire\u00e7\u00e3o da for\u00e7a.<\/span><\/p>\n<p><strong><span>A energia potencial<\/span><\/strong><span>\u00a0associada a um sistema que consiste na Terra e em uma part\u00edcula pr\u00f3xima \u00e9\u00a0\u00a0<\/span><strong><span>a energia potencial gravitacional<\/span><\/strong><span>\u00a0.<\/span><\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/gravitational-potential-energy-equation.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-15712 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/gravitational-potential-energy-equation.png\" alt=\"equa\u00e7\u00e3o gravitacional do potencial de energia\" width=\"256\" height=\"45\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/gravitational-potential-energy-equation.png\" \/><\/a><\/p>\n<p><strong><span>A energia cin\u00e9tica,\u00a0<\/span><em><span>K<\/span><\/em><\/strong><span>\u00a0, depende da velocidade de um objeto e \u00e9 a capacidade de um objeto em movimento de trabalhar em outros objetos quando colide com eles.<\/span><\/p>\n<p><em><strong><span>\u00a0K = \u00bd mv\u00a0<\/span><sup><span>2<\/span><\/sup><\/strong><\/em><\/p>\n<p><span>A defini\u00e7\u00e3o acima mencionada (\u00a0<\/span><strong><span>E\u00a0<\/span><\/strong><strong><sub><span>mech<\/span><\/sub><\/strong><strong><span>\u00a0= U + K<\/span><\/strong><span>\u00a0) assume que o sistema est\u00e1\u00a0<\/span><strong><span>livre de atritos<\/span><\/strong><span>\u00a0e outras\u00a0<\/span><a title=\"Conservador - For\u00e7as n\u00e3o conservadoras\" href=\"https:\/\/www.nuclear-power.com\/laws-of-conservation\/law-of-conservation-of-energy\/conservative-nonconservative-forces\/\"><strong><span>for\u00e7as n\u00e3o conservadoras<\/span><\/strong><\/a><span>\u00a0.\u00a0A diferen\u00e7a entre uma for\u00e7a conservadora e uma n\u00e3o conservadora \u00e9 que, quando uma for\u00e7a conservadora move um objeto de um ponto para outro, o trabalho realizado pela for\u00e7a conservadora \u00e9 independente do caminho.<\/span><\/p>\n<p><span>Em qualquer situa\u00e7\u00e3o real,\u00a0<\/span><strong><span>for\u00e7as de atrito<\/span><\/strong><span>\u00a0e outras\u00a0<strong>for\u00e7as<\/strong>\u00a0n\u00e3o conservadoras est\u00e3o presentes, mas em muitos casos seus efeitos no sistema s\u00e3o t\u00e3o pequenos que o princ\u00edpio de\u00a0<\/span><strong><span>conserva\u00e7\u00e3o de energia mec\u00e2nica<\/span><\/strong><span>\u00a0pode ser usado como uma aproxima\u00e7\u00e3o justa.\u00a0Por exemplo, a for\u00e7a de atrito \u00e9 uma for\u00e7a n\u00e3o conservadora, porque atua para reduzir a energia mec\u00e2nica em um sistema.<\/span><\/p>\n<p><span>Observe que for\u00e7as n\u00e3o conservadoras nem sempre reduzem a energia mec\u00e2nica.\u00a0Uma for\u00e7a n\u00e3o conservadora altera a energia mec\u00e2nica; existem for\u00e7as que aumentam a energia mec\u00e2nica total, como a for\u00e7a fornecida por um motor ou motor, tamb\u00e9m \u00e9 uma for\u00e7a n\u00e3o conservadora.<\/span><\/p>\n<\/div>\n<\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-100 lgc-tablet-grid-100 lgc-mobile-grid-100 lgc-equal-heights  lgc-first lgc-last\">\n<div class=\"inside-grid-column\">\n<div class=\"su-spacer\"><\/div>\n<h2><span>Bloco deslizando por uma ladeira sem atrito<\/span><\/h2>\n<p><span>O bloco de 1 kg inicia uma altura H (digamos 1 m) acima do solo, com\u00a0<\/span><strong><span>energia potencial\u00a0<\/span><\/strong><strong><span>mgH<\/span><\/strong><span>\u00a0e\u00a0<\/span><strong><span>energia cin\u00e9tica<\/span><\/strong><span>\u00a0igual a 0.\u00a0<strong>Desliza<\/strong>\u00a0para o ch\u00e3o (sem atrito) e chega sem energia potencial e energia cin\u00e9tica\u00a0<\/span><strong><span>K = \u00bd mv\u00a0<\/span><sup><span>2<\/span><\/sup><\/strong><span>\u00a0.\u00a0Calcule a velocidade do bloco no ch\u00e3o e sua energia cin\u00e9tica.<\/span><\/p>\n<p><strong><em><span>E\u00a0<\/span><\/em><\/strong><strong><em><sub><span>mech<\/span><\/sub><\/em><\/strong><strong><em><span>\u00a0= U + K = const<\/span><\/em><\/strong><\/p>\n<p><strong><em><span>=&gt; \u00bd mv\u00a0<\/span><\/em><\/strong><strong><em><sup><span>2<\/span><\/sup><\/em><\/strong><strong><em><span>\u00a0= mgH<\/span><\/em><\/strong><\/p>\n<p><strong><em><span>=&gt; v = \u221a2gH = 4,43 m \/ s<\/span><\/em><\/strong><\/p>\n<p><strong><em><span>=&gt; K\u00a0<\/span><\/em><\/strong><strong><em><sub><span>2<\/span><\/sub><\/em><\/strong><strong><em><span>\u00a0= \u00bd x 1 kg x (4,43 m \/ s)\u00a0<\/span><\/em><\/strong><strong><em><sup><span>2<\/span><\/sup><\/em><\/strong><strong><em><span>\u00a0= 19,62 kg.m\u00a0<\/span><\/em><\/strong><strong><em><sup><span>2<\/span><\/sup><\/em><\/strong><strong><em><span>\u00a0.s\u00a0<\/span><\/em><\/strong><strong><em><sup><span>-2<\/span><\/sup><\/em><\/strong><strong><em><span>\u00a0= 19,62 J<\/span><\/em><\/strong><\/p>\n<\/div>\n<\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-100 lgc-tablet-grid-100 lgc-mobile-grid-100 lgc-equal-heights  lgc-first lgc-last\">\n<div class=\"inside-grid-column\">\n<div class=\"su-spacer\"><\/div>\n<h2><span>P\u00eandulo<\/span><\/h2>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/conservartion-of-mechanical-energy-pendulum.png\"><img loading=\"lazy\" class=\"alignright size-full wp-image-15713 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/conservartion-of-mechanical-energy-pendulum.png\" alt=\"conserva\u00e7\u00e3o-do-p\u00eandulo-de-energia-mec\u00e2nica\" width=\"282\" height=\"214\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/conservartion-of-mechanical-energy-pendulum.png\" \/><\/a><span>Suponha um\u00a0<\/span><strong><span>p\u00eandulo<\/span><\/strong><span>\u00a0(bola de massa m suspensa em uma corda de comprimento\u00a0<\/span><strong><span>L<\/span><\/strong><span>\u00a0que t\u00eam puxado para cima de modo a que a bola \u00e9 uma altura\u00a0<\/span><strong><span>H &lt;G<\/span><\/strong><span>\u00a0acima do seu ponto mais baixo do arco do seu movimento corda esticada. O p\u00eandulo \u00e9 submetido ao\u00a0<\/span><strong><span>conservador for\u00e7a gravitacional,<\/span><\/strong><span>\u00a0onde for\u00e7as de atrito como o arrasto a\u00e9reo e o atrito no piv\u00f4 s\u00e3o desprez\u00edveis.<\/span><\/p>\n<p><span>N\u00f3s o liberamos do descanso.\u00a0<\/span><strong><span>Qu\u00e3o r\u00e1pido est\u00e1 indo no fundo?<\/span><\/strong><\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/conservartion-of-mechanical-energy-pendulum2.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-15714 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/conservartion-of-mechanical-energy-pendulum2.png\" alt=\"conserva\u00e7\u00e3o-de-energia-mec\u00e2nica-p\u00eandulo2\" width=\"322\" height=\"115\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/conservartion-of-mechanical-energy-pendulum2.png\" \/><\/a><\/p>\n<p><span>O p\u00eandulo atinge a\u00a0<\/span><strong><span>maior energia cin\u00e9tica<\/span><\/strong><span>\u00a0e\u00a0<\/span><strong><span>menos energia potencial<\/span><\/strong><span>\u00a0quando na\u00a0<\/span><strong><span>posi\u00e7\u00e3o vertical<\/span><\/strong><span>\u00a0, porque ter\u00e1 a maior velocidade e estar\u00e1 mais pr\u00f3ximo da Terra neste ponto.\u00a0Por outro lado, ter\u00e1 sua\u00a0<\/span><strong><span>energia menos cin\u00e9tica<\/span><\/strong><span>\u00a0e\u00a0<\/span><strong><span>maior energia potencial<\/span><\/strong><span>\u00a0nas\u00a0<\/span><strong><span>posi\u00e7\u00f5es extremas<\/span><\/strong><span>\u00a0de seu balan\u00e7o, porque possui velocidade zero e est\u00e1 mais distante da Terra nesses pontos.<\/span><\/p>\n<p><span>Se a amplitude \u00e9 limitada a pequenas oscila\u00e7\u00f5es, o per\u00edodo\u00a0<\/span><em><span>T<\/span><\/em><span>\u00a0de um p\u00eandulo simples, o tempo necess\u00e1rio para um ciclo completo, \u00e9:<\/span><\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/period-of-pendulum-conservation-of-energy.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-15715 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/period-of-pendulum-conservation-of-energy.png\" alt=\"per\u00edodo-de-p\u00eandulo-conserva\u00e7\u00e3o-de-energia\" width=\"252\" height=\"77\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/period-of-pendulum-conservation-of-energy.png\" \/><\/a><\/p>\n<p><span>onde\u00a0<\/span><strong><em><span>L<\/span><\/em><\/strong><span>\u00a0\u00e9 o comprimento do p\u00eandulo\u00a0<\/span><strong><em><span>eg<\/span><\/em><\/strong><span>\u00a0\u00e9 a acelera\u00e7\u00e3o local da gravidade.\u00a0Para balan\u00e7os pequenos, o per\u00edodo de oscila\u00e7\u00e3o \u00e9 aproximadamente o mesmo para balan\u00e7os de tamanhos diferentes.\u00a0Ou seja,\u00a0\u00a0<\/span><strong><span>o per\u00edodo \u00e9 independente da amplitude<\/span><\/strong><span>\u00a0.<\/span><\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<p>&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;.<\/p>\n<p>Este artigo \u00e9 baseado na tradu\u00e7\u00e3o autom\u00e1tica do artigo original em ingl\u00eas. Para mais informa\u00e7\u00f5es, consulte o artigo em ingl\u00eas. Voc\u00ea pode nos ajudar. Se voc\u00ea deseja corrigir a tradu\u00e7\u00e3o, envie-a para: translations@nuclear-power.com ou preencha o formul\u00e1rio de tradu\u00e7\u00e3o on-line. Agradecemos sua ajuda, atualizaremos a tradu\u00e7\u00e3o o mais r\u00e1pido poss\u00edvel. Obrigado.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Na f\u00edsica, energia mec\u00e2nica (Emech) \u00e9 a energia associada ao movimento e posi\u00e7\u00e3o de um objeto geralmente em algum campo de for\u00e7a (por exemplo, campo gravitacional).\u00a0Engenharia T\u00e9rmica O que \u00e9 energia mec\u00e2nica Na f\u00edsica,\u00a0energia mec\u00e2nica\u00a0(E\u00a0mech\u00a0) \u00e9 a energia associada ao\u00a0movimento\u00a0e\u00a0posi\u00e7\u00e3o\u00a0de um objeto geralmente em algum campo de for\u00e7a (por exemplo, campo gravitacional).\u00a0A energia mec\u00e2nica\u00a0(e tamb\u00e9m &#8230; <a title=\"O que \u00e9 energia mec\u00e2nica &#8211; defini\u00e7\u00e3o\" class=\"read-more\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-energia-mecanica-definicao\/\" aria-label=\"More on O que \u00e9 energia mec\u00e2nica &#8211; defini\u00e7\u00e3o\">Ler mais<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[14],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v15.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>O que \u00e9 energia mec\u00e2nica - defini\u00e7\u00e3o<\/title>\n<meta name=\"description\" content=\"Na f\u00edsica, energia mec\u00e2nica (Emech) \u00e9 a energia associada ao movimento e posi\u00e7\u00e3o de um objeto geralmente em algum campo de for\u00e7a (por exemplo, campo gravitacional). 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