{"id":45767,"date":"2019-10-20T03:43:48","date_gmt":"2019-10-20T02:43:48","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/quel-est-lexemple-de-lenergie-cinetique-definition\/"},"modified":"2020-02-26T11:08:58","modified_gmt":"2020-02-26T10:08:58","slug":"quel-est-lexemple-de-lenergie-cinetique-definition","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/fr\/quel-est-lexemple-de-lenergie-cinetique-definition\/","title":{"rendered":"L&#8217;exemple de l&#8217;\u00e9nergie cin\u00e9tique &#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 cin\u00e9tique.\u00a0L&#8217;\u00e9nergie cin\u00e9tique 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.\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 cin\u00e9tique<\/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><\/p>\n<p><strong>L&#8217;\u00e9nergie cin\u00e9tique,\u00a0<em>K<\/em><\/strong>\u00a0, est d\u00e9finie comme l&#8217;\u00e9nergie stock\u00e9e dans un objet en raison de son mouvement.\u00a0Un objet en mouvement a la capacit\u00e9 de travailler et peut donc \u00eatre consid\u00e9r\u00e9 comme ayant de l&#8217;\u00e9nergie.\u00a0Cela s&#8217;appelle l&#8217;\u00e9nergie cin\u00e9tique, du mot grec kinetikos, qui signifie \u00abmouvement\u00bb.<\/p>\n<p>L&#8217;\u00a0<strong>\u00e9nergie cin\u00e9tique<\/strong>\u00a0d\u00e9pend de la vitesse d&#8217;un objet et correspond \u00e0 la capacit\u00e9 d&#8217;un objet en mouvement \u00e0 travailler sur d&#8217;autres objets lorsqu&#8217;il entre en collision avec eux.\u00a0D&#8217;autre part, l&#8217;\u00e9nergie cin\u00e9tique d&#8217;un objet repr\u00e9sente la quantit\u00e9 d&#8217;\u00e9nergie n\u00e9cessaire pour augmenter la vitesse de l&#8217;objet du repos (v = 0) \u00e0 sa vitesse finale.\u00a0L&#8217;\u00e9nergie cin\u00e9tique d\u00e9pend \u00e9galement de mani\u00e8re lin\u00e9aire de la masse, qui est une mesure num\u00e9rique de l&#8217;\u00a0<strong>inertie<\/strong>\u00a0de l&#8217;objet\u00a0et la mesure de la r\u00e9sistance de celui-ci \u00e0 l&#8217;acc\u00e9l\u00e9ration lorsqu&#8217;une force est appliqu\u00e9e.<\/p>\n<p>Nous d\u00e9finissons la quantit\u00e9:<\/p>\n<p><em><strong>K = \u00bd mv\u00a0<sup>2<\/sup><\/strong><\/em><\/p>\n<p>\u00eatre l&#8217;\u00a0<strong>\u00e9nergie cin\u00e9tique de translation<\/strong>\u00a0de l&#8217;objet.\u00a0Il faut ajouter qu\u2019on l\u2019appelle \u00e9nergie cin\u00e9tique \u00abtranslationnelle\u00bb pour la distinguer de l\u2019\u00e9nergie cin\u00e9tique rotationnelle.<\/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<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<h2><span>Exemples d&#8217;\u00e9nergie cin\u00e9tique<\/span><\/h2>\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-accordion\">\n<div class=\"su-spoiler su-spoiler-style-default su-spoiler-icon-plus su-spoiler-closed\">\n<ul>\n<li class=\"su-spoiler-title\" tabindex=\"0\" role=\"button\"><span>\u00c9nergie cin\u00e9tique des fragments de fission<\/span><\/li>\n<li class=\"su-spoiler-title\" tabindex=\"0\" role=\"button\">\u00c9nergie cin\u00e9tique des neutrons rapide<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul>\n<li class=\"su-spoiler-title\" tabindex=\"0\" role=\"button\">\u00c9nergie cin\u00e9tique dans une collision nucl\u00e9aire \u00e9lastique<\/li>\n<\/ul>\n<\/div>\n<\/div>\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-accordion\">\n<div class=\"su-spoiler su-spoiler-style-default su-spoiler-icon-plus su-spoiler-closed\">\n<div class=\"su-spoiler-content su-clearfix\">\n<p>&nbsp;<\/p>\n<\/div>\n<\/div>\n<\/div>\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<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 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>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<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: \u00e9nergie cin\u00e9tique du proton<\/span><\/h2>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/what-is-proton-physics-min.png\"><img loading=\"lazy\" class=\"alignright size-medium wp-image-16556 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/what-is-proton-physics-min-300x300.png\" alt=\"Qu'est-ce que le proton - physique\" width=\"300\" height=\"300\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/what-is-proton-physics-min-300x300.png\" \/><\/a><span>Un proton (\u00a0<\/span><strong><span>m = 1,67 x 10\u00a0<\/span><sup><span>-27<\/span><\/sup><span>\u00a0kg<\/span><\/strong><span>\u00a0) se d\u00e9place \u00e0 une vitesse\u00a0<\/span><strong><span>v = 0,9900c = 2,968 x 10\u00a0<\/span><sup><span>8<\/span><\/sup><span>\u00a0m \/ s<\/span><\/strong><span>\u00a0.\u00a0Quelle est son\u00a0<\/span><strong><span>\u00e9nergie cin\u00e9tique<\/span><\/strong><span>\u00a0?<\/span><\/p>\n<p><span>Selon un calcul classique, qui n&#8217;est pas correct, on obtiendrait:<\/span><\/p>\n<p><span>K = 1 \/ 2mv\u00a0<\/span><sup><span>2<\/span><\/sup><span>\u00a0= \u00bd x (1,67 x 10\u00a0<\/span><sup><span>-27<\/span><\/sup><span>\u00a0kg) x (2,968 x 10\u00a0<\/span><sup><span>8<\/span><\/sup><span>\u00a0m \/ s)\u00a0<\/span><sup><span>2<\/span><\/sup><span>\u00a0=\u00a0<\/span><strong><span>7,355 x 10\u00a0<\/span><sup><span>-11<\/span><\/sup><span>\u00a0J<\/span><\/strong><\/p>\n<p><span>Avec la correction\u00a0<\/span><strong><span>relativiste, l&#8217;\u00e9nergie cin\u00e9tique relativiste<\/span><\/strong><span>\u00a0est \u00e9gale \u00e0:<\/span><\/p>\n<p><strong><span>K = (\u0263 &#8211; 1) mc\u00a0<\/span><sup><span>2<\/span><\/sup><\/strong><\/p>\n<p><span>o\u00f9 le facteur de Lorentz<\/span><\/p>\n<p><span>\u0263 = 7,089<\/span><\/p>\n<p><span>par cons\u00e9quent<\/span><\/p>\n<p><span>K = 6,089 x (1,67 x 10\u00a0<\/span><sup><span>-27<\/span><\/sup><span>\u00a0kg) x (2,9979 x 10\u00a0<\/span><sup><span>8<\/span><\/sup><span>\u00a0m \/ s)\u00a0<\/span><sup><span>2<\/span><\/sup><span>\u00a0=\u00a0<\/span><strong><span>9,139 x 10\u00a0<\/span><sup><span>-10<\/span><\/sup><span>\u00a0J = 5,701 GeV<\/span><\/strong><\/p>\n<p><span>C&#8217;est environ\u00a0<\/span><strong><span>12 fois plus d&#8217;<\/span><\/strong><span>\u00a0\u00e9nergie que dans le calcul classique.\u00a0Selon cette relation, une acc\u00e9l\u00e9ration d&#8217;un faisceau de protons \u00e0 5,7 GeV n\u00e9cessite des \u00e9nergies qui sont dans l&#8217;ordre diff\u00e9rent.<\/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\"><\/div>\n<\/div>\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=\"su-spoiler-content su-clearfix\">\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<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Exemples d&#8217;\u00e9nergie cin\u00e9tique.\u00a0L&#8217;\u00e9nergie cin\u00e9tique 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.\u00a0G\u00e9nie thermique Quelle est l&#8217;\u00e9nergie cin\u00e9tique L&#8217;\u00e9nergie cin\u00e9tique,\u00a0K\u00a0, est d\u00e9finie comme l&#8217;\u00e9nergie stock\u00e9e dans un objet en raison de son mouvement.\u00a0Un objet en mouvement a la capacit\u00e9 de travailler et peut donc \u00eatre &#8230; <a title=\"L&#8217;exemple de l&#8217;\u00e9nergie cin\u00e9tique &#8211; D\u00e9finition\" class=\"read-more\" href=\"https:\/\/www.thermal-engineering.org\/fr\/quel-est-lexemple-de-lenergie-cinetique-definition\/\" aria-label=\"En savoir plus sur L&#8217;exemple de l&#8217;\u00e9nergie cin\u00e9tique &#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>L&#039;exemple de l&#039;\u00e9nergie cin\u00e9tique - D\u00e9finition<\/title>\n<meta name=\"description\" content=\"Exemples d&#039;\u00e9nergie cin\u00e9tique. 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