{"id":1843,"date":"2025-08-13T15:26:00","date_gmt":"2025-08-13T13:26:00","guid":{"rendered":"https:\/\/acriv.org\/WP\/?page_id=1843"},"modified":"2025-08-13T15:26:00","modified_gmt":"2025-08-13T13:26:00","slug":"%e2%9c%88%ef%b8%8f-pourquoi-un-avion-vole","status":"publish","type":"page","link":"https:\/\/acriv.org\/WP\/%e2%9c%88%ef%b8%8f-pourquoi-un-avion-vole\/","title":{"rendered":"\u2708\ufe0f POURQUOI UN AVION VOLE"},"content":{"rendered":"\n<p><\/p>\n\n\n\n<p>Un avion vole gr\u00e2ce \u00e0 un \u00e9quilibre bien orchestr\u00e9 entre <strong>quatre forces principales<\/strong> et \u00e0 la forme particuli\u00e8re de ses ailes.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1. Les quatre forces<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Portance (Lift)<\/strong> : force qui pousse l\u2019avion vers le haut. Elle est cr\u00e9\u00e9e par les ailes.<\/li>\n\n\n\n<li><strong>Poids (Weight)<\/strong> : force due \u00e0 la gravit\u00e9 qui attire l\u2019avion vers le bas.<\/li>\n\n\n\n<li><strong>Pouss\u00e9e (Thrust)<\/strong> : force qui propulse l\u2019avion vers l\u2019avant, produite par les moteurs ou h\u00e9lices.<\/li>\n\n\n\n<li><strong>Tra\u00een\u00e9e (Drag)<\/strong> : r\u00e9sistance de l\u2019air qui freine l\u2019avion.<\/li>\n<\/ul>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"599\" src=\"https:\/\/acriv.org\/WP\/wp-content\/uploads\/2025\/08\/image-38-1024x599.png\" alt=\"\" class=\"wp-image-1846\" style=\"width:405px;height:auto\" srcset=\"https:\/\/acriv.org\/WP\/wp-content\/uploads\/2025\/08\/image-38-1024x599.png 1024w, https:\/\/acriv.org\/WP\/wp-content\/uploads\/2025\/08\/image-38-300x176.png 300w, https:\/\/acriv.org\/WP\/wp-content\/uploads\/2025\/08\/image-38-768x449.png 768w, https:\/\/acriv.org\/WP\/wp-content\/uploads\/2025\/08\/image-38-800x468.png 800w, https:\/\/acriv.org\/WP\/wp-content\/uploads\/2025\/08\/image-38-513x300.png 513w, https:\/\/acriv.org\/WP\/wp-content\/uploads\/2025\/08\/image-38-310x181.png 310w, https:\/\/acriv.org\/WP\/wp-content\/uploads\/2025\/08\/image-38-150x88.png 150w, https:\/\/acriv.org\/WP\/wp-content\/uploads\/2025\/08\/image-38.png 1282w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n<\/div>\n\n\n<h3 class=\"wp-block-heading\">2. Le r\u00f4le des ailes<\/h3>\n\n\n\n<p>Les ailes sont profil\u00e9es (forme dite <strong>a\u00e9rodynamique<\/strong>).<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>L\u2019air qui passe au-dessus de l\u2019aile parcourt un trajet l\u00e9g\u00e8rement plus long que l\u2019air qui passe en dessous.<\/li>\n\n\n\n<li>Cela cr\u00e9e une diff\u00e9rence de pression (plus faible au-dessus, plus forte en dessous), ce qui <strong>soul\u00e8ve<\/strong> l\u2019aile.<\/li>\n\n\n\n<li>C\u2019est ce ph\u00e9nom\u00e8ne, d\u00e9crit par la combinaison de la <strong>loi de Bernoulli<\/strong> et de la <strong>d\u00e9viation de l\u2019air (principe de Newton)<\/strong>, qui produit la portance.<\/li>\n<\/ul>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"295\" height=\"171\" src=\"https:\/\/acriv.org\/WP\/wp-content\/uploads\/2025\/08\/images.jpg\" alt=\"\" class=\"wp-image-1844\" style=\"width:334px;height:auto\" srcset=\"https:\/\/acriv.org\/WP\/wp-content\/uploads\/2025\/08\/images.jpg 295w, https:\/\/acriv.org\/WP\/wp-content\/uploads\/2025\/08\/images-150x87.jpg 150w\" sizes=\"auto, (max-width: 295px) 100vw, 295px\" \/><\/figure>\n<\/div>\n\n\n<h3 class=\"wp-block-heading\">3. L\u2019\u00e9quilibre en vol<\/h3>\n\n\n\n<p>Pour que l\u2019avion reste en vol :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>La <strong>portance<\/strong> doit \u00e9galer le <strong>poids<\/strong>.<\/li>\n\n\n\n<li>La <strong>pouss\u00e9e<\/strong> doit compenser la <strong>tra\u00een\u00e9e<\/strong>.<\/li>\n<\/ul>\n\n\n\n<p>Si la pouss\u00e9e est sup\u00e9rieure, l\u2019avion acc\u00e9l\u00e8re ; si la portance est sup\u00e9rieure au poids, il monte.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Un avion vole gr\u00e2ce \u00e0 un \u00e9quilibre bien orchestr\u00e9 entre quatre forces principales et \u00e0 la forme particuli\u00e8re de ses ailes. 1. Les quatre forces 2. Le r\u00f4le des ailes Les ailes sont profil\u00e9es (forme dite a\u00e9rodynamique). 3. L\u2019\u00e9quilibre en vol Pour que l\u2019avion reste en vol : Si la pouss\u00e9e est sup\u00e9rieure, l\u2019avion acc\u00e9l\u00e8re ; si la portance est<\/p>\n<p><a class=\"more-link\" href=\"https:\/\/acriv.org\/WP\/%e2%9c%88%ef%b8%8f-pourquoi-un-avion-vole\/\">Read More<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-1843","page","type-page","status-publish","hentry"],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/acriv.org\/WP\/wp-json\/wp\/v2\/pages\/1843","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/acriv.org\/WP\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/acriv.org\/WP\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/acriv.org\/WP\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/acriv.org\/WP\/wp-json\/wp\/v2\/comments?post=1843"}],"version-history":[{"count":1,"href":"https:\/\/acriv.org\/WP\/wp-json\/wp\/v2\/pages\/1843\/revisions"}],"predecessor-version":[{"id":1847,"href":"https:\/\/acriv.org\/WP\/wp-json\/wp\/v2\/pages\/1843\/revisions\/1847"}],"wp:attachment":[{"href":"https:\/\/acriv.org\/WP\/wp-json\/wp\/v2\/media?parent=1843"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}