{"id":3707,"date":"2018-11-19T13:39:47","date_gmt":"2018-11-19T12:39:47","guid":{"rendered":"http:\/\/agora.xtec.cat\/ceipgitanjali\/?p=3707"},"modified":"2019-01-14T00:15:29","modified_gmt":"2019-01-13T23:15:29","slug":"3r-setmana-de-la-ciencia-2018","status":"publish","type":"post","link":"https:\/\/agora.xtec.cat\/ceipgitanjali\/primaria\/3r\/3r-setmana-de-la-ciencia-2018\/","title":{"rendered":"Classe de 3r: Setmana de la ci\u00e8ncia 2018"},"content":{"rendered":"<p><a href=\"https:\/\/agora.xtec.cat\/ceipgitanjali\/wp-content\/uploads\/usu1569\/2018\/11\/r\u00e8tols-preguntes-ciencia-2018-6-e1542629500199.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-3667 alignleft\" src=\"https:\/\/agora.xtec.cat\/ceipgitanjali\/wp-content\/uploads\/usu1569\/2018\/11\/r\u00e8tols-preguntes-ciencia-2018-6-724x1024.jpg\" alt=\"\" width=\"261\" height=\"369\" \/><\/a><!--more--><\/p>\n<ul>\n<li><strong>LA FOR\u00c7A<\/strong> \u00c9S IMPORTANT DOMINAR LA FOR\u00c7A AMB QUE ESTIREM LA GOMA EL\u00c0STICA PER ACONSEGUIR TOCAR LA DIANA.<\/li>\n<li><strong>LA POSICI\u00d3 CAP A ON APUNTEM<\/strong> AMB EL &#8220;TIRAXINES&#8221; PER ACONSEGUIR LA TRAJECT\u00d2RIA QUE NECESSITEM, HEM OBSERVAT QUE PODEM TIRAR DE DUES FORMES, RECTE O ENLAIRE ACONSEGUINT UNA TRAJECT\u00d2RIA BOMBEJADA.\n<ul>\n<li><strong>EL PES:<\/strong> SI EL PROJECTIL PESA M\u00c9S, ACONSEGUIM QUE VAGI M\u00c9S LLUNY, SI PESA POC VA M\u00c9S A LA VORA.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p><strong style=\"font-family: inherit; font-size: 1em;\">EXPERIMENTS i ACTIVITATS QUE HEM DUT A TERME:<\/strong><\/p>\n<p><strong>Llan\u00e7ament de gomes a diferent tensi\u00f3:<a href=\"https:\/\/agora.xtec.cat\/ceipgitanjali\/wp-content\/uploads\/usu1569\/2018\/11\/IMG-20181114-WA0023-e1542628705201.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-3706 alignright\" src=\"https:\/\/agora.xtec.cat\/ceipgitanjali\/wp-content\/uploads\/usu1569\/2018\/11\/IMG-20181114-WA0023-e1542628705201-1024x876.jpg\" alt=\"\" width=\"254\" height=\"217\" srcset=\"https:\/\/agora.xtec.cat\/ceipgitanjali\/wp-content\/uploads\/usu1569\/2018\/11\/IMG-20181114-WA0023-e1542628705201-1024x876.jpg 1024w, https:\/\/agora.xtec.cat\/ceipgitanjali\/wp-content\/uploads\/usu1569\/2018\/11\/IMG-20181114-WA0023-e1542628705201-300x257.jpg 300w, https:\/\/agora.xtec.cat\/ceipgitanjali\/wp-content\/uploads\/usu1569\/2018\/11\/IMG-20181114-WA0023-e1542628705201-768x657.jpg 768w, https:\/\/agora.xtec.cat\/ceipgitanjali\/wp-content\/uploads\/usu1569\/2018\/11\/IMG-20181114-WA0023-e1542628705201.jpg 1187w\" sizes=\"auto, (max-width: 254px) 100vw, 254px\" \/><\/a><\/strong><\/p>\n<p>Material:<\/p>\n<p>&#8211; Gomes el\u00e0stiques del mateix tipus i longitud<\/p>\n<p>&#8211; Regle llarg<\/p>\n<p>&#8211; Guix<\/p>\n<p>&#8211; Metro \/ Cinta m\u00e8trica<\/p>\n<p><strong>Experimenta i observa:<\/strong> Si tens un regle llarg, pots utilitzar-lo directament per al llan\u00e7ament. Si no, busca una fusta per exemple i marca-hi dist\u00e0ncies de 5 en 5 cent\u00edmetres. Busca un ajudant i un lloc a l&#8217;exterior per a aquest experiment.<\/p>\n<p>V\u00e0rem comprovar amb gometes i un regle llarg que com m\u00e9s tib\u00e0vem la goma m\u00e9s lluny anava.<\/p>\n<p>Per exemple: estirant 30 cm la goma, vam aconseguir llen\u00e7ar-la a m\u00e9s de 7 m de longitud.<\/p>\n<p>Tamb\u00e9 v\u00e0rem provar quina goma aniria m\u00e9s lluny si una de molt dura i ample o una de m\u00e9s fina i el\u00e0stica. Tots pens\u00e0vem que la dura es quedaria m\u00e9s a la vora i va ser una sorpresa que va sortir volant molt lluny, estirant molt poc la goma per\u00f2 estirant al m\u00e0xim les dues gomes anaven al mateix lloc.<\/p>\n<p><strong>&#8220;Tiraxines&#8221; gegant i joc de\u00a0&#8220;AngryBirds&#8221; amb els nostre propis &#8220;tiraxines&#8221;.<\/strong><\/p>\n<p><a href=\"https:\/\/agora.xtec.cat\/ceipgitanjali\/wp-content\/uploads\/usu1569\/2018\/11\/20181116_114600-e1542628601248.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-3704 alignleft\" src=\"https:\/\/agora.xtec.cat\/ceipgitanjali\/wp-content\/uploads\/usu1569\/2018\/11\/20181116_114600-e1542628601248-1024x842.jpg\" alt=\"\" width=\"241\" height=\"198\" srcset=\"https:\/\/agora.xtec.cat\/ceipgitanjali\/wp-content\/uploads\/usu1569\/2018\/11\/20181116_114600-e1542628601248-1024x842.jpg 1024w, https:\/\/agora.xtec.cat\/ceipgitanjali\/wp-content\/uploads\/usu1569\/2018\/11\/20181116_114600-e1542628601248-300x247.jpg 300w, https:\/\/agora.xtec.cat\/ceipgitanjali\/wp-content\/uploads\/usu1569\/2018\/11\/20181116_114600-e1542628601248-768x631.jpg 768w\" sizes=\"auto, (max-width: 241px) 100vw, 241px\" \/><\/a>Es tracta de muntar un tirador \u201ctiraxines\u201d en gran. Nom\u00e9s necessites una goma el\u00e0stica lligada a les potes d&#8217;una taula invertida<\/p>\n<p>Els projectils estan fets amb trossos de paper (un full tallat per la meitat al llarg, i doblegat despr\u00e9s formant plecs d&#8217;uns 5 cm d&#8217;ample i finalment doblegat per la meitat per poder enganxar-a la goma el\u00e0stica). Pots donar al projectil la forma que tu vulguis. Nosaltres vam decidir fer una petita modificaci\u00f3 per jugar al joc &#8220;AngryBirds&#8221; amb dibuixos dels coneguts ocells i vam muntar un objectiu a enderrocar: una torre feta amb els jocs de psicomotricitat, en qu\u00e8 col\u00b7loc\u00e0vem estrat\u00e8gicament uns quants &#8220;porquets&#8221; creats per nosaltres.<a href=\"https:\/\/agora.xtec.cat\/ceipgitanjali\/wp-content\/uploads\/usu1569\/2018\/11\/20181113_101116-e1542628797948.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-3702 alignright\" src=\"https:\/\/agora.xtec.cat\/ceipgitanjali\/wp-content\/uploads\/usu1569\/2018\/11\/20181113_101116-e1542628797948-1024x906.jpg\" alt=\"\" width=\"229\" height=\"203\" srcset=\"https:\/\/agora.xtec.cat\/ceipgitanjali\/wp-content\/uploads\/usu1569\/2018\/11\/20181113_101116-e1542628797948-1024x906.jpg 1024w, https:\/\/agora.xtec.cat\/ceipgitanjali\/wp-content\/uploads\/usu1569\/2018\/11\/20181113_101116-e1542628797948-300x265.jpg 300w, https:\/\/agora.xtec.cat\/ceipgitanjali\/wp-content\/uploads\/usu1569\/2018\/11\/20181113_101116-e1542628797948-768x679.jpg 768w\" sizes=\"auto, (max-width: 229px) 100vw, 229px\" \/>.<\/a><\/p>\n<p>\u00c9s una manera divertida i actual de jugar amb diferents conceptes f\u00edsics: forces, elasticitat, acceleraci\u00f3, gravetat, massa, etc. Ja que, com en el popular joc, haur\u00e0s de jugar amb moltes variables fins a aconseguir per fi enderrocar l&#8217;objectiu: la dist\u00e0ncia de despla\u00e7ament cap enrere de la goma el\u00e0stica abans de deixar anar el projectil, el pes del projectil, l&#8217;angle de llan\u00e7ament i la dist\u00e0ncia a la qual col\u00b7loques la torre.<a href=\"https:\/\/agora.xtec.cat\/ceipgitanjali\/wp-content\/uploads\/usu1569\/2018\/11\/20181116_121447.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-3705 alignleft\" src=\"https:\/\/agora.xtec.cat\/ceipgitanjali\/wp-content\/uploads\/usu1569\/2018\/11\/20181116_121447-1024x768.jpg\" alt=\"\" width=\"303\" height=\"227\" srcset=\"https:\/\/agora.xtec.cat\/ceipgitanjali\/wp-content\/uploads\/usu1569\/2018\/11\/20181116_121447-1024x768.jpg 1024w, https:\/\/agora.xtec.cat\/ceipgitanjali\/wp-content\/uploads\/usu1569\/2018\/11\/20181116_121447-300x225.jpg 300w, https:\/\/agora.xtec.cat\/ceipgitanjali\/wp-content\/uploads\/usu1569\/2018\/11\/20181116_121447-768x576.jpg 768w, https:\/\/agora.xtec.cat\/ceipgitanjali\/wp-content\/uploads\/usu1569\/2018\/11\/20181116_121447-200x150.jpg 200w\" sizes=\"auto, (max-width: 303px) 100vw, 303px\" \/><\/a><\/p>\n<p>Quan tibem la goma despla\u00e7ant cap enrere el bra\u00e7, utilitzem una energia que s&#8217;emmagatzema en la goma en forma <strong>d&#8217;energia potencial<\/strong>. Quan deixem anar la goma el\u00e0stica, recupera la seva posici\u00f3 inicial transmetent la seva energia en forma\u00a0<strong>d&#8217;energia cin\u00e8tica<\/strong> al projectil que pot continuar el moviment.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-3703 alignright\" src=\"https:\/\/agora.xtec.cat\/ceipgitanjali\/wp-content\/uploads\/usu1569\/2018\/11\/20181113_113406-1024x768.jpg\" alt=\"\" width=\"384\" height=\"288\" srcset=\"https:\/\/agora.xtec.cat\/ceipgitanjali\/wp-content\/uploads\/usu1569\/2018\/11\/20181113_113406-1024x768.jpg 1024w, https:\/\/agora.xtec.cat\/ceipgitanjali\/wp-content\/uploads\/usu1569\/2018\/11\/20181113_113406-300x225.jpg 300w, https:\/\/agora.xtec.cat\/ceipgitanjali\/wp-content\/uploads\/usu1569\/2018\/11\/20181113_113406-768x576.jpg 768w, https:\/\/agora.xtec.cat\/ceipgitanjali\/wp-content\/uploads\/usu1569\/2018\/11\/20181113_113406-200x150.jpg 200w\" sizes=\"auto, (max-width: 384px) 100vw, 384px\" \/><\/p>\n<p>Les gomes el\u00e0stiques estan formades per llargues cadenes de mol\u00e8cules enrotllades formant una mena de xarxa. Quan la estires, les mol\u00e8cules es desenrotllen i es col\u00b7loquen en l\u00ednia unes al costat d&#8217;altres.<\/p>\n<p>L&#8217;energia que utilitzes per estirar la goma, s&#8217;acumula en ella en forma <strong>d&#8217;energia potencial <\/strong>el\u00e0stica. Quan deixes anar la goma, les mol\u00e8cules recuperen la seva forma inicial, enrotllant-se altra vegada. L&#8217;energia acumulada en forma <strong>d&#8217;energia el\u00e0stica es transforma r\u00e0pidament en energia cin\u00e8tica<\/strong>, que \u00e9s la que provoca moviment. Aix\u00f2 fa que la goma surti volant. Com m\u00e9s estires la goma, m\u00e9s energia el\u00e0stica acumules, i m\u00e9s moviment (major dist\u00e0ncia) recorre la goma.<\/p>\n<p style=\"text-align: center;\"><a href=\"https:\/\/agora.xtec.cat\/ceipgitanjali\/wp-content\/uploads\/usu1569\/2018\/11\/20181116_121339-e1542630299261.jpg\"><br \/>\n<img loading=\"lazy\" decoding=\"async\" class=\"wp-image-3710 alignleft\" src=\"https:\/\/agora.xtec.cat\/ceipgitanjali\/wp-content\/uploads\/usu1569\/2018\/11\/20181116_121339-e1542630299261-822x1024.jpg\" alt=\"\" width=\"402\" height=\"500\" srcset=\"https:\/\/agora.xtec.cat\/ceipgitanjali\/wp-content\/uploads\/usu1569\/2018\/11\/20181116_121339-e1542630299261-822x1024.jpg 822w, https:\/\/agora.xtec.cat\/ceipgitanjali\/wp-content\/uploads\/usu1569\/2018\/11\/20181116_121339-e1542630299261-241x300.jpg 241w, https:\/\/agora.xtec.cat\/ceipgitanjali\/wp-content\/uploads\/usu1569\/2018\/11\/20181116_121339-e1542630299261-768x956.jpg 768w\" sizes=\"auto, (max-width: 402px) 100vw, 402px\" \/><\/a><a href=\"https:\/\/agora.xtec.cat\/ceipgitanjali\/wp-content\/uploads\/usu1569\/2018\/11\/20181119_110045.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-3713 alignleft\" src=\"https:\/\/agora.xtec.cat\/ceipgitanjali\/wp-content\/uploads\/usu1569\/2018\/11\/20181119_110045-768x1024.jpg\" alt=\"\" width=\"378\" height=\"504\" srcset=\"https:\/\/agora.xtec.cat\/ceipgitanjali\/wp-content\/uploads\/usu1569\/2018\/11\/20181119_110045-768x1024.jpg 768w, https:\/\/agora.xtec.cat\/ceipgitanjali\/wp-content\/uploads\/usu1569\/2018\/11\/20181119_110045-225x300.jpg 225w\" sizes=\"auto, (max-width: 378px) 100vw, 378px\" \/><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":3710,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_bbp_topic_count":0,"_bbp_reply_count":0,"_bbp_total_topic_count":0,"_bbp_total_reply_count":0,"_bbp_voice_count":0,"_bbp_anonymous_reply_count":0,"_bbp_topic_count_hidden":0,"_bbp_reply_count_hidden":0,"_bbp_forum_subforum_count":0,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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