{"id":3680,"date":"2025-12-14T10:45:31","date_gmt":"2025-12-14T09:45:31","guid":{"rendered":"https:\/\/www.collegedelouest.ch\/wordpress\/?p=3680"},"modified":"2026-03-12T21:35:46","modified_gmt":"2026-03-12T20:35:46","slug":"dehors-en-equilibre","status":"publish","type":"post","link":"https:\/\/www.collegedelouest.ch\/wordpress\/2025\/12\/14\/dehors-en-equilibre\/","title":{"rendered":"Dehors \u00ab En \u00e9quilibre \u00bb"},"content":{"rendered":"\n<h1 class=\"wp-block-heading\">Dehors \u00ab En \u00e9quilibre \u00bb<\/h1>\n\n\n\n<ul id=\"block-07c6d08a-9eb4-424e-af69-fc8800e159ec\" class=\"wp-block-list\">\n<li>Date : 9 d\u00e9cembre 2025<\/li>\n\n\n\n<li>Lieu : Ancien acroland<\/li>\n\n\n\n<li>Nombre d&rsquo;\u00e9l\u00e8ves : 18<\/li>\n\n\n\n<li>Niveau : quatri\u00e8me Harmos<\/li>\n\n\n\n<li>Temps : beau temps, chaud (env. 10\u00b0C), presque printanier<\/li>\n\n\n\n<li>Temps de travail : env. une heure<\/li>\n\n\n\n<li>Num\u00e9ro de la s\u00e9ance du document de r\u00e9f\u00e9rence : <\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"block-d7b594cf-d619-4535-abb6-fd826da8964f\">Objectifs<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">S&rsquo;interroger sur l&rsquo;\u00e9quilibre d&rsquo;un pendule. D\u00e9couverte d&rsquo;un centre d&rsquo;\u00e9quilibre, puis approche tr\u00e8s intuitive de la notion de bras de levier par l&rsquo;\u00e9quilibre de deux masses diff\u00e9rentes.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"842\" src=\"https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/SN_3-4_GD_Equilibre_intercal-2_01_questionnement-sciences-1024x842.png\" alt=\"\" class=\"wp-image-3700\" srcset=\"https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/SN_3-4_GD_Equilibre_intercal-2_01_questionnement-sciences-1024x842.png 1024w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/SN_3-4_GD_Equilibre_intercal-2_01_questionnement-sciences-300x247.png 300w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/SN_3-4_GD_Equilibre_intercal-2_01_questionnement-sciences-768x631.png 768w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/SN_3-4_GD_Equilibre_intercal-2_01_questionnement-sciences-690x567.png 690w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/SN_3-4_GD_Equilibre_intercal-2_01_questionnement-sciences-980x806.png 980w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/SN_3-4_GD_Equilibre_intercal-2_01_questionnement-sciences.png 1080w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Une partie des points \u00e9voqu\u00e9s sur l&rsquo;image ci-dessus n&rsquo;a pas \u00e9t\u00e9 r\u00e9alis\u00e9. Mais les notions de position du point de gravit\u00e9 par rapport au sol et celle de position du centre de gravit\u00e9 d&rsquo;un bateau, seront reprises dans un atelier o\u00f9 l&rsquo;eau pourra \u00eatre pr\u00e9sente.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"block-aad91833-8ff9-4738-8228-3339c6eeb761\">Pr\u00e9liminaire<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Un petit rituel s&rsquo;est \u00e9tabli avec quelques \u00e9l\u00e8ves qui consiste \u00e0 faire du calcul mental pendant le d\u00e9placement vers la for\u00eat avec une approche tr\u00e8s intuitive des nombres n\u00e9gatifs.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"block-b4b14bdb-108a-45f5-881b-6a2b50716655\">Travaux pratiques<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Position d&rsquo;\u00e9quilibre<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Trouver une branche d&rsquo;arbre la plus droite possible, assez solide, autant que possible d\u00e9pourvue de branches lat\u00e9rales, ne fut pas un probl\u00e8me. En effet, la for\u00eat mise \u00e0 mal par une temp\u00eate, en regorgeait.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"768\" src=\"https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Prepa4-1024x768.jpg\" alt=\"\" class=\"wp-image-3696\" srcset=\"https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Prepa4-1024x768.jpg 1024w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Prepa4-300x225.jpg 300w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Prepa4-768x576.jpg 768w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Prepa4-1536x1152.jpg 1536w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Prepa4-690x518.jpg 690w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Prepa4-980x735.jpg 980w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Prepa4.jpg 1920w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Ensuite, la recherche du point d&rsquo;\u00e9quilibre de la branche seule ne fut pas simple pour les \u00e9l\u00e8ves. Pas parce qu&rsquo;ils ne comprenaient pas cette notion, non parce qu&rsquo;ils ne pouvaient le situer, ce qu&rsquo;ils firent tr\u00e8s bien en posant la branche sur l&rsquo;un de leur doigt, mais parce qu&rsquo;ils devaient y accrocher le fil de suspension principal. Pour \u00e9viter d&rsquo;avoir \u00e0 faire des n\u0153uds difficiles, ils avaient \u00e0 leur disposition une ficelle au milieu de laquelle se trouvait un petit fil m\u00e9tallique rigide mais facilement pliable. En tordant ce lien, ils ont pu r\u00e9aliser des boucles qu&rsquo;ils pouvaient coulisser pour trouver le centre de gravit\u00e9. Mais, celui-ci d\u00e9termin\u00e9, bloquer le n\u0153ud \u00e0 l&rsquo;endroit pr\u00e9cis de celui-ci a \u00e9t\u00e9 difficile et il a fallu les aider.<\/p>\n\n\n\n<figure class=\"wp-block-gallery has-nested-images columns-default is-cropped wp-block-gallery-1 is-layout-flex wp-block-gallery-is-layout-flex\">\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"768\" data-id=\"3693\" src=\"https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Prepa3-1024x768.jpg\" alt=\"\" class=\"wp-image-3693\" srcset=\"https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Prepa3-1024x768.jpg 1024w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Prepa3-300x225.jpg 300w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Prepa3-768x576.jpg 768w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Prepa3-1536x1152.jpg 1536w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Prepa3-690x518.jpg 690w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Prepa3-980x735.jpg 980w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Prepa3.jpg 1920w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"768\" data-id=\"3692\" src=\"https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/CG1-1024x768.jpg\" alt=\"\" class=\"wp-image-3692\" srcset=\"https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/CG1-1024x768.jpg 1024w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/CG1-300x225.jpg 300w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/CG1-768x576.jpg 768w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/CG1-1536x1152.jpg 1536w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/CG1-690x518.jpg 690w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/CG1-980x735.jpg 980w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/CG1.jpg 1920w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n<\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Un groupe n&rsquo;a pas imm\u00e9diatement compris ce qu&rsquo;il fallait faire et \u00e0 bloqu\u00e9 sa branche sous des pierres pour qu&rsquo;elle ne bouge pas, au lieu de la suspendre. En voyant les autres, ils ont spontan\u00e9ment repris leur travail et r\u00e9alis\u00e9 l&rsquo;\u00e9quilibre de la branche.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u00c9l\u00e9ments du mobile<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Pour la suspension des \u00e9l\u00e9ments du mobile, un de chaque c\u00f4t\u00e9, il fallait trouver des objets de masse approximativement identique. La plus grande partie de leur travail fut consacr\u00e9e \u00e0 cet recherche. Mais, plut\u00f4t que de trouver deux objets de m\u00eame masse, il proc\u00e9d\u00e8rent comme avec une balance : on accroche un \u00e9l\u00e9ment de r\u00e9f\u00e9rence, puis on en trouve un autre qui contre-balance le premier.<\/p>\n\n\n\n<figure class=\"wp-block-gallery has-nested-images columns-default is-cropped wp-block-gallery-2 is-layout-flex wp-block-gallery-is-layout-flex\">\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"768\" height=\"1024\" data-id=\"3695\" src=\"https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Prepa1-768x1024.jpg\" alt=\"\" class=\"wp-image-3695\" srcset=\"https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Prepa1-768x1024.jpg 768w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Prepa1-225x300.jpg 225w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Prepa1-1152x1536.jpg 1152w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Prepa1-690x920.jpg 690w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Prepa1-980x1307.jpg 980w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Prepa1.jpg 1440w\" sizes=\"auto, (max-width: 768px) 100vw, 768px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"768\" data-id=\"3694\" src=\"https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Prepa3-1-1024x768.jpg\" alt=\"\" class=\"wp-image-3694\" srcset=\"https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Prepa3-1-1024x768.jpg 1024w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Prepa3-1-300x225.jpg 300w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Prepa3-1-768x576.jpg 768w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Prepa3-1-1536x1152.jpg 1536w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Prepa3-1-690x518.jpg 690w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Prepa3-1-980x735.jpg 980w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Prepa3-1.jpg 1920w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n<\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">De plus, \u00e0 la difficult\u00e9 d&rsquo;envisager deux masses identiques, s&rsquo;est ajout\u00e9e celle de les accrocher. Si par exemple, la premi\u00e8re \u00e9tait faite d&rsquo;un tas de mousses, le choix de la seconde sous forme de pierre en imposait une de trop petite dimension pour pouvoir l&rsquo;accrocher. Rapidement, quelques groupes ont compris que le choix du bois pour ces deux \u00e9l\u00e9ments lat\u00e9raux du mobile \u00e9tait tr\u00e8s int\u00e9ressant parce qu&rsquo;ils pouvaient en casser une partie pour r\u00e9aliser l&rsquo;\u00e9quilibre.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">R\u00e9sultats<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">L&rsquo;\u00e9valuation du r\u00e9sultat \u00e9tait tr\u00e8s simple : tenir le mobile par la ficelle centrale et s&rsquo;il \u00e9tait en \u00e9quilibre aller l&rsquo;accrocher \u00e0 une corde que nous avions tendue entre deux arbres.<\/p>\n\n\n\n<figure class=\"wp-block-gallery has-nested-images columns-default is-cropped wp-block-gallery-3 is-layout-flex wp-block-gallery-is-layout-flex\">\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"768\" data-id=\"3689\" src=\"https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Mobile1-1024x768.jpg\" alt=\"\" class=\"wp-image-3689\" srcset=\"https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Mobile1-1024x768.jpg 1024w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Mobile1-300x225.jpg 300w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Mobile1-768x576.jpg 768w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Mobile1-1536x1152.jpg 1536w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Mobile1-690x518.jpg 690w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Mobile1-980x735.jpg 980w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Mobile1.jpg 1920w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"768\" data-id=\"3691\" src=\"https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Mobile2-1024x768.jpg\" alt=\"\" class=\"wp-image-3691\" srcset=\"https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Mobile2-1024x768.jpg 1024w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Mobile2-300x225.jpg 300w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Mobile2-768x576.jpg 768w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Mobile2-1536x1152.jpg 1536w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Mobile2-690x518.jpg 690w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Mobile2-980x735.jpg 980w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Mobile2.jpg 1920w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"768\" data-id=\"3690\" src=\"https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Mobile3-1024x768.jpg\" alt=\"\" class=\"wp-image-3690\" srcset=\"https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Mobile3-1024x768.jpg 1024w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Mobile3-300x225.jpg 300w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Mobile3-768x576.jpg 768w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Mobile3-1536x1152.jpg 1536w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Mobile3-690x518.jpg 690w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Mobile3-980x735.jpg 980w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Mobile3.jpg 1920w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"768\" data-id=\"3684\" src=\"https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Mobile4-1024x768.jpg\" alt=\"\" class=\"wp-image-3684\" srcset=\"https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Mobile4-1024x768.jpg 1024w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Mobile4-300x225.jpg 300w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Mobile4-768x576.jpg 768w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Mobile4-1536x1152.jpg 1536w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Mobile4-690x518.jpg 690w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Mobile4-980x735.jpg 980w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Mobile4.jpg 1920w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"768\" data-id=\"3688\" src=\"https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Mobile5-1024x768.jpg\" alt=\"\" class=\"wp-image-3688\" srcset=\"https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Mobile5-1024x768.jpg 1024w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Mobile5-300x225.jpg 300w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Mobile5-768x576.jpg 768w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Mobile5-1536x1152.jpg 1536w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Mobile5-690x518.jpg 690w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Mobile5-980x735.jpg 980w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Mobile5.jpg 1920w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"768\" data-id=\"3685\" src=\"https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Mobile6-1024x768.jpg\" alt=\"\" class=\"wp-image-3685\" srcset=\"https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Mobile6-1024x768.jpg 1024w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Mobile6-300x225.jpg 300w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Mobile6-768x576.jpg 768w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Mobile6-1536x1152.jpg 1536w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Mobile6-690x518.jpg 690w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Mobile6-980x735.jpg 980w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Mobile6.jpg 1920w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"768\" data-id=\"3686\" src=\"https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Mobile7-1024x768.jpg\" alt=\"\" class=\"wp-image-3686\" srcset=\"https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Mobile7-1024x768.jpg 1024w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Mobile7-300x225.jpg 300w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Mobile7-768x576.jpg 768w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Mobile7-1536x1152.jpg 1536w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Mobile7-690x518.jpg 690w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Mobile7-980x735.jpg 980w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Mobile7.jpg 1920w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"768\" data-id=\"3687\" src=\"https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Mobile8-1024x768.jpg\" alt=\"\" class=\"wp-image-3687\" srcset=\"https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Mobile8-1024x768.jpg 1024w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Mobile8-300x225.jpg 300w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Mobile8-768x576.jpg 768w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Mobile8-1536x1152.jpg 1536w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Mobile8-690x518.jpg 690w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Mobile8-980x735.jpg 980w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/Mobile8.jpg 1920w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n<\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Finalement<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">La pr\u00e9sentation de tous les mobiles fut un grand moment. Un l\u00e9ger vent les faisait se balancer et chacun a pu constater que son travail pr\u00e9sentait un aspect tr\u00e8s esth\u00e9tique.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"768\" src=\"https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/ToutLesMobiles-1024x768.jpg\" alt=\"\" class=\"wp-image-3698\" srcset=\"https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/ToutLesMobiles-1024x768.jpg 1024w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/ToutLesMobiles-300x225.jpg 300w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/ToutLesMobiles-768x576.jpg 768w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/ToutLesMobiles-1536x1152.jpg 1536w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/ToutLesMobiles-690x518.jpg 690w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/ToutLesMobiles-980x735.jpg 980w, https:\/\/www.collegedelouest.ch\/wordpress\/wp-content\/uploads\/2025\/12\/ToutLesMobiles.jpg 1920w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<div style=\"height:23px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">En d\u00e9finitive, la recherche des \u00e9l\u00e9ments du mobile, celle du centre de gravit\u00e9, des \u00e9quilibres avec les \u00e9l\u00e9ments du mobile se sont faites avec une grande intensit\u00e9 parce que le but \u00e9tait clair : l&rsquo;\u00e9quilibre final sur la corde. \u00c0 part la ficelle l\u00e9g\u00e8rement rigidifi\u00e9e pour \u00e9viter les n\u0153uds, aucun autre mat\u00e9riel n&rsquo;a \u00e9t\u00e9 n\u00e9cessaire. Nous avons cependant eu de la chance avec le temps, car accrocher des \u00e9l\u00e9ments sur une branche avec les doigts dans un froid vif aurait \u00e9t\u00e9 probl\u00e9matique.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Enfin, aucun \u00e9l\u00e8ve n&rsquo;a demand\u00e9 un moment de pause. Leur concentration a \u00e9t\u00e9 maximale du d\u00e9but \u00e0 la fin et les premiers attendirent m\u00eame que tout le monde ait fini pour improviser une petite descente \u00e0 la course sur l&rsquo;ancienne piste de ski (voir image en avant).<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Dehors \u00ab En \u00e9quilibre \u00bb Objectifs S&rsquo;interroger sur l&rsquo;\u00e9quilibre d&rsquo;un pendule. D\u00e9couverte d&rsquo;un centre d&rsquo;\u00e9quilibre, puis approche tr\u00e8s intuitive de la notion de bras de levier par l&rsquo;\u00e9quilibre de deux masses diff\u00e9rentes. Une partie des points \u00e9voqu\u00e9s sur l&rsquo;image ci-dessus n&rsquo;a pas \u00e9t\u00e9 r\u00e9alis\u00e9. Mais les notions de position du point de gravit\u00e9 par rapport [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":3705,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"image","meta":{"footnotes":""},"categories":[32,47,46],"tags":[],"class_list":["post-3680","post","type-post","status-publish","format-image","has-post-thumbnail","hentry","category-classe-celine-guyot-et-audrey-thiebaud-2021-22","category-dehors","category-travaux-202526","post_format-post-format-image"],"_links":{"self":[{"href":"https:\/\/www.collegedelouest.ch\/wordpress\/wp-json\/wp\/v2\/posts\/3680","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.collegedelouest.ch\/wordpress\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.collegedelouest.ch\/wordpress\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.collegedelouest.ch\/wordpress\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.collegedelouest.ch\/wordpress\/wp-json\/wp\/v2\/comments?post=3680"}],"version-history":[{"count":14,"href":"https:\/\/www.collegedelouest.ch\/wordpress\/wp-json\/wp\/v2\/posts\/3680\/revisions"}],"predecessor-version":[{"id":3711,"href":"https:\/\/www.collegedelouest.ch\/wordpress\/wp-json\/wp\/v2\/posts\/3680\/revisions\/3711"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.collegedelouest.ch\/wordpress\/wp-json\/wp\/v2\/media\/3705"}],"wp:attachment":[{"href":"https:\/\/www.collegedelouest.ch\/wordpress\/wp-json\/wp\/v2\/media?parent=3680"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.collegedelouest.ch\/wordpress\/wp-json\/wp\/v2\/categories?post=3680"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.collegedelouest.ch\/wordpress\/wp-json\/wp\/v2\/tags?post=3680"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}