{"id":6971,"date":"2021-02-26T19:16:48","date_gmt":"2021-02-26T18:16:48","guid":{"rendered":"http:\/\/agora.xtec.cat\/ceiprellinars\/?p=6971"},"modified":"2021-02-26T19:46:26","modified_gmt":"2021-02-26T18:46:26","slug":"el-misteri-de-la-bruixola-que-no-assenyala-el-nord","status":"publish","type":"post","link":"https:\/\/agora.xtec.cat\/ceiprellinars\/actualitat\/el-misteri-de-la-bruixola-que-no-assenyala-el-nord\/","title":{"rendered":"El misteri de la\u00a0 br\u00faixola que no assenyala el nord"},"content":{"rendered":"

Continuem amb els laboratoris de la missi\u00f3 Alba!<\/p>\n

Aquest cop vam comen\u00e7ar definint qu\u00e8 \u00e9s per a nosaltres la for\u00e7a i ens van sorgir molts tipus de forces: la for\u00e7a humana, la de l’aigua, la del vent, la de la gravetat, la magn\u00e8tica…<\/p>\n

L’experiment del laboratori comen\u00e7ava a partir de trastejar amb la br\u00faixola, on vam sortir a fora per parelles amb una a les mans. El repte era aconseguir que la br\u00faixola no assenyali el nord, en principi un repte bastant complex. Vam estar cinc minuts fent diferents proves, girs, salts, posant-la del rev\u00e9s, corrent…fins que algunes parelles van tenir una idea: apropar un imant a la br\u00faixola. Quan la vam apropar la br\u00faixola va deixar d’assenyalar el nord i comen\u00e7ava a seguir el moviment del imant que tenia a sota!<\/p>\n

El laboratori continuava i ens vam plantejar un altre repte, fer un circuit el\u00e8ctric. L’objectiu d’aquest era encendre una bombeta, per tant cada grup va comen\u00e7ar a dissenyar el seu a un paper i va anotar els materials que necessitaria per poder superar el repte. Despr\u00e9s amb els materials, cada grup va muntar el seu circuit per veure si funciona. Gaireb\u00e9 tots els grups vam fer servir el mateix material: bombeta, pila, cables i pela-cables. Al cap d’alguns intents, fent les proves amb els cables, la bombeta se’ns va il\u00b7luminar a tots els grups quan vam connectar els cables al lloc correcte.<\/p>\n

El seg\u00fcent pas era fer un altre circuit per\u00f2 aquest cop sense la bombeta. Per a aquest hav\u00edem d’enrotllar un cable d’un metre i amb una cinta ho assegurem per a que no es desf\u00e9s l’embolic del cable. A continuaci\u00f3, a una pila, li hav\u00edem de connectar els dos extrems amb l’ajuda de dues pinces de cocodril per assegurar que no es desconnect\u00e9s. Tot seguit, un a un, vam agafar la br\u00faixola i la vam moure al voltant del circuit. Impressionant el que va succeir, quan aprop\u00e0vem la br\u00faixola al circuit, durant el instant que aquesta estava prop, l’agulla tornava a deixar d’assenyalar el nord.<\/p>\n

Tot aquest succ\u00e9s ocorre degut a una for\u00e7a invisible als ulls: la for\u00e7a magn\u00e8tica<\/strong>. L’agulla de la br\u00faixola est\u00e0 imantada, i es sent atreta pels imants, com l’imant que vam apropar o el circuit el\u00e8ctric que va generar un camp electromagn\u00e8tic al seu voltant. Com que l’imant m\u00e9s gran de la Terra \u00e9s el nucli de la pr\u00f2pia Terra, la br\u00faixola sempre assenyalar\u00e0 a un dels pols d’aquest imant. Com a curiositat que ens va sorprendre us diem que els pols magn\u00e8tics<\/strong> no s\u00f3n els mateixos que els pols geogr\u00e0fics<\/strong>, \u00e9s a dir, estan canviats de sentit.<\/p>\n

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Continuem amb els laboratoris de la missi\u00f3 Alba! Aquest cop vam comen\u00e7ar definint qu\u00e8 \u00e9s per a nosaltres la for\u00e7a i ens van sorgir molts tipus de forces: la for\u00e7a humana, la de l’aigua, la del vent, la de la gravetat, la magn\u00e8tica… L’experiment del laboratori comen\u00e7ava a partir de trastejar amb la br\u00faixola, on […]<\/p>\n","protected":false},"author":23,"featured_media":6952,"comment_status":"open","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 center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[1,9],"tags":[],"class_list":["post-6971","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualitat","category-grans"],"post_mailing_queue_ids":[],"_links":{"self":[{"href":"https:\/\/agora.xtec.cat\/ceiprellinars\/wp-json\/wp\/v2\/posts\/6971","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/agora.xtec.cat\/ceiprellinars\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/agora.xtec.cat\/ceiprellinars\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/agora.xtec.cat\/ceiprellinars\/wp-json\/wp\/v2\/users\/23"}],"replies":[{"embeddable":true,"href":"https:\/\/agora.xtec.cat\/ceiprellinars\/wp-json\/wp\/v2\/comments?post=6971"}],"version-history":[{"count":3,"href":"https:\/\/agora.xtec.cat\/ceiprellinars\/wp-json\/wp\/v2\/posts\/6971\/revisions"}],"predecessor-version":[{"id":6976,"href":"https:\/\/agora.xtec.cat\/ceiprellinars\/wp-json\/wp\/v2\/posts\/6971\/revisions\/6976"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/agora.xtec.cat\/ceiprellinars\/wp-json\/wp\/v2\/media\/6952"}],"wp:attachment":[{"href":"https:\/\/agora.xtec.cat\/ceiprellinars\/wp-json\/wp\/v2\/media?parent=6971"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/agora.xtec.cat\/ceiprellinars\/wp-json\/wp\/v2\/categories?post=6971"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/agora.xtec.cat\/ceiprellinars\/wp-json\/wp\/v2\/tags?post=6971"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}