{"id":45783,"date":"2019-10-20T04:40:50","date_gmt":"2019-10-20T03:40:50","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/quest-ce-quun-exemple-denergie-mecanique-definition\/"},"modified":"2020-02-26T11:12:18","modified_gmt":"2020-02-26T10:12:18","slug":"quest-ce-quun-exemple-denergie-mecanique-definition","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/fr\/quest-ce-quun-exemple-denergie-mecanique-definition\/","title":{"rendered":"Exemple d&#8217;\u00e9nergie m\u00e9canique &#8211; D\u00e9finition"},"content":{"rendered":"<div class=\"su-quote su-quote-style-default\">\n<div class=\"su-quote-inner su-clearfix\">Exemples d&#8217;\u00e9nergie m\u00e9canique.\u00a0L&#8217;\u00e9nergie m\u00e9canique (et \u00e9galement l&#8217;\u00e9nergie thermique) peut \u00eatre s\u00e9par\u00e9e en deux cat\u00e9gories, transitoire et stock\u00e9e.\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>Quelle est l&#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<\/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>Exemple: bloc glissant sur une pente inclin\u00e9e sans frottement<\/h2>\n<p>Le bloc de 1 kg commence \u00e0 une hauteur H (disons 1 m) au-dessus du sol, avec\u00a0<strong>une \u00e9nergie potentielle en\u00a0<\/strong><strong>mgH<\/strong>\u00a0et\u00a0<strong>une \u00e9nergie cin\u00e9tique<\/strong>\u00a0\u00e9gale \u00e0 0. Il glisse vers le sol (sans frottement) et arrive sans \u00e9nergie potentielle ni \u00e9nergie cin\u00e9tique.\u00a0<strong>K = \u00bd mv\u00a0<sup>2<\/sup><\/strong>\u00a0.\u00a0Calculez la vitesse du bloc au sol et son \u00e9nergie cin\u00e9tique.<\/p>\n<p><strong><em>E\u00a0<\/em><\/strong><strong><em><sub>mech<\/sub><\/em><\/strong><strong><em>\u00a0= U + K = const<\/em><\/strong><\/p>\n<p><strong><em>=&gt; \u00bd mv\u00a0<\/em><\/strong><strong><em><sup>2<\/sup><\/em><\/strong><strong><em>\u00a0= mgH<\/em><\/strong><\/p>\n<p><strong><em>=&gt; v = \u221a2gH = 4,43 m \/ s<\/em><\/strong><\/p>\n<p><strong><em>=&gt; K\u00a0<\/em><\/strong><strong><em><sub>2<\/sub><\/em><\/strong><strong><em>\u00a0= \u00bd x 1 kg x (4,43 m \/ s)\u00a0<\/em><\/strong><strong><em><sup>2<\/sup><\/em><\/strong><strong><em>\u00a0= 19,62 kg.m\u00a0<\/em><\/strong><strong><em><sup>2<\/sup><\/em><\/strong><strong><em>\u00a0.s\u00a0<\/em><\/strong><strong><em><sup>-2<\/sup><\/em><\/strong><strong><em>\u00a0= 19,62 J<\/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>Exemple: pendule<\/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=\"pendule \u00e0 conservation d'\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><span>Supposons un\u00a0<\/span><strong><span>pendule<\/span><\/strong><span>\u00a0(boule de masse m suspendue \u00e0 une cha\u00eene de longueur\u00a0<\/span><strong><span>L<\/span><\/strong><span>\u00a0que nous avons tir\u00e9e de sorte que la balle soit \u00e0 une hauteur\u00a0<\/span><strong><span>H &lt;L<\/span><\/strong><span>\u00a0au-dessus de son point le plus bas sur l&#8217;arc de son mouvement de corde tendue. Le pendule est soumis au\u00a0<\/span><strong><span>conservateur force gravitationnelle<\/span><\/strong><span>\u00a0o\u00f9 les forces de friction comme la tra\u00een\u00e9e d&#8217;air et la friction au pivot sont n\u00e9gligeables.<\/span><\/p>\n<p><span>Nous le lib\u00e9rons du repos.\u00a0<\/span><strong><span>\u00c0 quelle vitesse va-t-il au fond?<\/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=\"pendule \u00e0 conservation d'\u00e9nergie m\u00e9canique2\" 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>Le pendule atteint la\u00a0<\/span><strong><span>plus grande \u00e9nergie cin\u00e9tique<\/span><\/strong><span>\u00a0et le\u00a0<\/span><strong><span>moins d&#8217;\u00e9nergie potentielle<\/span><\/strong><span>\u00a0lorsqu&#8217;il est en\u00a0<\/span><strong><span>position verticale<\/span><\/strong><span>\u00a0, car il aura la plus grande vitesse et sera le plus proche de la Terre \u00e0 ce point.\u00a0D&#8217;un autre c\u00f4t\u00e9, il aura sa\u00a0<\/span><strong><span>moindre \u00e9nergie cin\u00e9tique<\/span><\/strong><span>\u00a0et sa\u00a0<\/span><strong><span>plus grande \u00e9nergie potentielle<\/span><\/strong><span>\u00a0aux\u00a0<\/span><strong><span>positions extr\u00eames<\/span><\/strong><span>\u00a0de son swing, car il a une vitesse nulle et est le plus \u00e9loign\u00e9 de la Terre en ces points.<\/span><\/p>\n<p><span>Si l&#8217;amplitude est limit\u00e9e \u00e0 de petites oscillations, la p\u00e9riode\u00a0<\/span><em><span>T<\/span><\/em><span>\u00a0d&#8217;un simple pendule, le temps pris pour un cycle complet, est:<\/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=\"p\u00e9riode-de-pendule-conservation-d'\u00e9nergie\" 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>o\u00f9\u00a0<\/span><strong><em><span>L<\/span><\/em><\/strong><span>\u00a0est la longueur du pendule et\u00a0<\/span><strong><em><span>g<\/span><\/em><\/strong><span>\u00a0est l&#8217;acc\u00e9l\u00e9ration locale de la gravit\u00e9.\u00a0Pour les petites balan\u00e7oires, la p\u00e9riode de balancement est approximativement la m\u00eame pour les balan\u00e7oires de tailles diff\u00e9rentes.\u00a0Autrement dit,\u00a0\u00a0<\/span><strong><span>la p\u00e9riode est ind\u00e9pendante de l&#8217;amplitude<\/span><\/strong><span>\u00a0.<\/span><\/p>\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>Exemples d&#8217;\u00e9nergie m\u00e9canique.\u00a0L&#8217;\u00e9nergie m\u00e9canique (et \u00e9galement l&#8217;\u00e9nergie thermique) peut \u00eatre s\u00e9par\u00e9e en deux cat\u00e9gories, transitoire et stock\u00e9e.\u00a0G\u00e9nie thermique Quelle est l&#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 deux cat\u00e9gories, transitoire et &#8230; <a title=\"Exemple d&#8217;\u00e9nergie m\u00e9canique &#8211; D\u00e9finition\" class=\"read-more\" href=\"https:\/\/www.thermal-engineering.org\/fr\/quest-ce-quun-exemple-denergie-mecanique-definition\/\" aria-label=\"En savoir plus sur Exemple d&#8217;\u00e9nergie m\u00e9canique &#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>Exemple d&#039;\u00e9nergie m\u00e9canique - D\u00e9finition<\/title>\n<meta name=\"description\" content=\"Exemples d&#039;\u00e9nergie m\u00e9canique. 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