{"id":45779,"date":"2019-10-20T04:22:07","date_gmt":"2019-10-20T03:22:07","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/quest-ce-que-la-formule-denergie-mecanique-equation-definition\/"},"modified":"2020-02-26T11:10:37","modified_gmt":"2020-02-26T10:10:37","slug":"quest-ce-que-la-formule-denergie-mecanique-equation-definition","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/fr\/quest-ce-que-la-formule-denergie-mecanique-equation-definition\/","title":{"rendered":"Qu&#8217;est-ce que la formule d&#8217;\u00e9nergie m\u00e9canique &#8211; Equation &#8211; D\u00e9finition"},"content":{"rendered":"<div class=\"su-quote su-quote-style-default\">\n<div class=\"su-quote-inner su-clearfix\">Formule d&#8217;\u00e9nergie m\u00e9canique &#8211; \u00e9quation.\u00a0Emech = U + K. L&#8217;\u00e9nergie m\u00e9canique stock\u00e9e existe sous l&#8217;une des deux formes suivantes: cin\u00e9tique ou potentielle.\u00a0G\u00e9nie thermique<\/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>Formule d&#8217;\u00e9nergie m\u00e9canique<\/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=\"conservation-du-pendule-\u00e9nergie-m\u00e9canique\" 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>En physique,\u00a0<strong>l&#8217;\u00e9nergie m\u00e9canique<\/strong>\u00a0(E\u00a0<sub>mech<\/sub>\u00a0) est l&#8217;\u00e9nergie associ\u00e9e au\u00a0<strong>mouvement<\/strong>\u00a0et \u00e0 la\u00a0<strong>position<\/strong>\u00a0d&#8217;un objet g\u00e9n\u00e9ralement dans un champ de force (par exemple, un champ gravitationnel).\u00a0<strong>L&#8217;\u00e9nergie m\u00e9canique<\/strong>\u00a0(et \u00e9galement l&#8217;\u00e9nergie thermique) peut \u00eatre s\u00e9par\u00e9e en deux cat\u00e9gories, transitoire et stock\u00e9e.\u00a0L&#8217;\u00e9nergie transitoire est l&#8217;\u00e9nergie en mouvement, c&#8217;est-\u00e0-dire l&#8217;\u00e9nergie transf\u00e9r\u00e9e d&#8217;un endroit \u00e0 un autre.\u00a0L&#8217;\u00e9nergie stock\u00e9e est l&#8217;\u00e9nergie contenue dans une substance ou un objet.\u00a0L&#8217;\u00e9nergie m\u00e9canique transitoire est commun\u00e9ment appel\u00e9e\u00a0<strong>travail<\/strong>\u00a0.\u00a0L&#8217;\u00e9nergie m\u00e9canique stock\u00e9e existe sous l&#8217;une des deux formes suivantes:\u00a0<strong>cin\u00e9tique<\/strong>\u00a0ou\u00a0<strong>potentielle<\/strong>\u00a0:<\/p>\n<ul>\n<li><strong>L&#8217; \u00e9nergie potentielle<\/strong>\u00a0.\u00a0L&#8217;\u00e9nergie potentielle, U, est d\u00e9finie comme l&#8217;\u00e9nergie stock\u00e9e dans un objet soumis \u00e0 une force conservatrice.\u00a0Les types courants incluent l&#8217;\u00e9nergie potentielle gravitationnelle d&#8217;un objet qui d\u00e9pend de sa masse et de sa distance au centre de masse d&#8217;un autre objet.<\/li>\n<li><strong>\u00c9nergie cin\u00e9tique<\/strong>\u00a0.\u00a0L&#8217;\u00e9nergie cin\u00e9tique,\u00a0<em>K<\/em>\u00a0, est d\u00e9finie comme l&#8217;\u00e9nergie stock\u00e9e dans un objet en raison de son mouvement.\u00a0Cela d\u00e9pend de la vitesse d&#8217;un objet et de la capacit\u00e9 d&#8217;un objet en mouvement \u00e0 travailler sur d&#8217;autres objets lorsqu&#8217;il entre en collision avec eux.<\/li>\n<\/ul>\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=\"exemple de conservation d'\u00e9nergie m\u00e9canique\" 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>Voir aussi:\u00a0<a title=\"Conservation de l'\u00e9nergie m\u00e9canique\" href=\"https:\/\/www.nuclear-power.com\/laws-of-conservation\/law-of-conservation-of-energy\/conservation-of-mechanical-energy\/\">Conservation de l&#8217;\u00e9nergie m\u00e9canique<\/a><\/p>\n<p><strong>Un syst\u00e8me isol\u00e9<\/strong>\u00a0est un\u00a0<strong>syst\u00e8me<\/strong>\u00a0dans lequel\u00a0<strong>aucune force externe ne<\/strong>\u00a0provoque de changement d&#8217;\u00e9nergie.\u00a0Si seules\u00a0<strong>les forces conservatrices<\/strong>\u00a0agissent sur un objet et que\u00a0<strong>U<\/strong>\u00a0est la\u00a0fonction d&#8217;\u00a0<strong>\u00e9nergie potentielle<\/strong>\u00a0pour la force conservatrice totale, alors<\/p>\n<p><em><strong>E\u00a0<\/strong><strong><sub>mech<\/sub><\/strong><strong>\u00a0= U + K<\/strong><\/em><\/p>\n<p><strong>L&#8217;\u00e9nergie potentielle,\u00a0<em>U<\/em><\/strong>\u00a0, d\u00e9pend de la position d&#8217;un objet soumis \u00e0 une force conservatrice.<\/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=\"\u00e9quation d'\u00e9nergie potentielle\" 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>Elle est d\u00e9finie comme la capacit\u00e9 de l&#8217;objet \u00e0 travailler et est augment\u00e9e \u00e0 mesure que l&#8217;objet est d\u00e9plac\u00e9 dans le sens oppos\u00e9 \u00e0 celui de la force.<\/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>L&#8217;\u00e9nergie potentielle<\/span><\/strong><span>\u00a0associ\u00e9e \u00e0 un syst\u00e8me compos\u00e9 de la Terre et d&#8217;une particule voisine est\u00a0\u00a0<\/span><strong><span>l&#8217;\u00e9nergie potentielle gravitationnelle<\/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=\"gravitationnel-potentiel-\u00e9nergie-\u00e9quation\" 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>L&#8217;\u00e9nergie cin\u00e9tique,\u00a0<\/span><em><span>K<\/span><\/em><\/strong><span>\u00a0, d\u00e9pend de la vitesse d&#8217;un objet et est la capacit\u00e9 d&#8217;un objet en mouvement \u00e0 travailler sur d&#8217;autres objets lorsqu&#8217;il entre en collision avec eux.<\/span><\/p>\n<p><em><strong><span>\u00a0K = \u00bd mv\u00a0<\/span><sup><span>2<\/span><\/sup><\/strong><\/em><\/p>\n<p><span>La d\u00e9finition mentionn\u00e9e ci-dessus (\u00a0<\/span><strong><span>E\u00a0<\/span><\/strong><strong><sub><span>mech<\/span><\/sub><\/strong><strong><span>\u00a0= U + K<\/span><\/strong><span>\u00a0) suppose que le syst\u00e8me est\u00a0<\/span><strong><span>exempt de frottement<\/span><\/strong><span>\u00a0et d&#8217;autres\u00a0<\/span><a title=\"Conservateur - Forces non conservatrices\" href=\"https:\/\/www.nuclear-power.com\/laws-of-conservation\/law-of-conservation-of-energy\/conservative-nonconservative-forces\/\"><strong><span>forces non conservatrices<\/span><\/strong><\/a><span>\u00a0.\u00a0La diff\u00e9rence entre une force conservatrice et une force non conservatrice est que lorsqu&#8217;une force conservatrice d\u00e9place un objet d&#8217;un point \u00e0 un autre, le travail effectu\u00e9 par la force conservatrice est ind\u00e9pendant du chemin.<\/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>Bloc glissant sur une pente inclin\u00e9e sans friction<\/span><\/h2>\n<p><span>Le bloc de 1 kg commence \u00e0 une hauteur H (disons 1 m) au-dessus du sol, avec\u00a0<\/span><strong><span>une \u00e9nergie potentielle\u00a0<\/span><\/strong><strong><span>mgH<\/span><\/strong><span>\u00a0et\u00a0<\/span><strong><span>une \u00e9nergie cin\u00e9tique<\/span><\/strong><span>\u00a0\u00e9gale \u00e0 0. Il glisse vers le sol (sans frottement) et arrive sans \u00e9nergie potentielle et \u00e9nergie cin\u00e9tique\u00a0<\/span><strong><span>K = \u00bd mv\u00a0<\/span><sup><span>2<\/span><\/sup><\/strong><span>\u00a0.\u00a0Calculez la vitesse du bloc au sol et son \u00e9nergie cin\u00e9tique.<\/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>\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>Cet article est bas\u00e9 sur la traduction automatique de l&#8217;article original en anglais. Pour plus d&#8217;informations, voir l&#8217;article en anglais. Pouvez vous nous aider Si vous souhaitez corriger la traduction, envoyez-la \u00e0 l&#8217;adresse: translations@nuclear-power.com ou remplissez le formulaire de traduction en ligne. Nous appr\u00e9cions votre aide, nous mettrons \u00e0 jour la traduction le plus rapidement possible. Merci<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Formule d&#8217;\u00e9nergie m\u00e9canique &#8211; \u00e9quation.\u00a0Emech = U + K. L&#8217;\u00e9nergie m\u00e9canique stock\u00e9e existe sous l&#8217;une des deux formes suivantes: cin\u00e9tique ou potentielle.\u00a0G\u00e9nie thermique Formule d&#8217;\u00e9nergie m\u00e9canique En physique,\u00a0l&#8217;\u00e9nergie m\u00e9canique\u00a0(E\u00a0mech\u00a0) est l&#8217;\u00e9nergie associ\u00e9e au\u00a0mouvement\u00a0et \u00e0 la\u00a0position\u00a0d&#8217;un objet g\u00e9n\u00e9ralement dans un champ de force (par exemple, un champ gravitationnel).\u00a0L&#8217;\u00e9nergie m\u00e9canique\u00a0(et \u00e9galement l&#8217;\u00e9nergie thermique) peut \u00eatre s\u00e9par\u00e9e en &#8230; <a title=\"Qu&#8217;est-ce que la formule d&#8217;\u00e9nergie m\u00e9canique &#8211; Equation &#8211; D\u00e9finition\" class=\"read-more\" href=\"https:\/\/www.thermal-engineering.org\/fr\/quest-ce-que-la-formule-denergie-mecanique-equation-definition\/\" aria-label=\"En savoir plus sur Qu&#8217;est-ce que la formule d&#8217;\u00e9nergie m\u00e9canique &#8211; Equation &#8211; D\u00e9finition\">Lire la suite<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[8],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v15.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Qu&#039;est-ce que la formule d&#039;\u00e9nergie m\u00e9canique - Equation - D\u00e9finition<\/title>\n<meta name=\"description\" content=\"Formule d&#039;\u00e9nergie m\u00e9canique - \u00e9quation. 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