Pas 2: Construcci\u00f3 del cos del coet<\/strong> A la segona ampolla, hem tallat un cilindre recte de la mateixa mida que el coll de l\u2019ampolla. Despr\u00e9s hem posat cola a la part tallada de l\u2019ampolla i l’hem enganxat a la part superior de l’altra ampolla, formant el cos del coet.<\/p>\n Pas 3: Disseny dels alerons<\/strong> Despr\u00e9s, hem dibuixat tres alerons en un tros de cart\u00f3 i els hem tallat. Aquests alerons s\u00f3n importants per donar estabilitat al coet durant el vol. Els hem enganxat amb cola a la base del coet i els hem refor\u00e7at amb cinta americana per assegurar-nos que no caiguessin.<\/p>\n Pas 4: Protecci\u00f3 de l\u2019impacte<\/strong> Per protegir el coet en el moment de l’aterratge, hem enganxat cinta\u00a0 i hem posat cola a la punta on tenim la pilota de porexpan. A sobre, hi hem posat una bossa de pl\u00e0stic per amortir l’impacte quan el coet toqui el terra. Com sempre, hem refor\u00e7at tot el conjunt amb cinta americana.<\/p>\n Pas 5: Creaci\u00f3 de la base de llan\u00e7ament<\/strong> Ara tocava crear la base des d’on llan\u00e7ar\u00edem el coet. Hem agafat una capsa de cartr\u00f3 i hem fet un forat per subjectar el coet. Per \u00faltim, hem agafat un tap de suro, l\u2019hem perforat per passar-hi l’inflador i l’hem situat a la part inferior del coet. Ara el coet estava preparat per ser inflat i llan\u00e7at!<\/p>\n Qu\u00e8 observem quan llancem el coet?<\/strong> Un cop el coet estava muntat, hem omplert l’ampolla amb una mica d\u2019aigua i hem comen\u00e7at a inflar amb l’inflador. En fer-ho, l\u2019aire ha comen\u00e7at a entrar a l\u2019ampolla, augmentant la pressi\u00f3 dins d\u2019aquesta. L\u2019aigua ha actuat com a combustible, ja que en expulsar-se a gran velocitat per la pressi\u00f3 de l\u2019aire, ha creat una for\u00e7a impulsora que ha fet enlairar el coet. Hem vist com el coet s’elevava i, quan la for\u00e7a es dissipava, ha caigut de nou al terra.<\/p>\n Qu\u00e8 hem apr\u00e8s?<\/strong> A m\u00e9s de divertir-nos, aquest experiment ens ha perm\u00e8s aprendre sobre la 3a llei de Newton<\/strong>, que diu que “per a cada acci\u00f3 hi ha una reacci\u00f3 de la mateixa magnitud per\u00f2 en sentit contrari”. En el nostre cas, l’aigua ha estat expulsada cap a baix amb for\u00e7a, i aix\u00f2 ha provocat que el coet s\u2019enlair\u00e9s cap amunt. Tamb\u00e9 hem ent\u00e8s que quan fem una for\u00e7a sobre un objecte, aquest ens retorna una altra for\u00e7a, i que si aquesta \u00e9s m\u00e9s petita, podem manipular l\u2019objecte.<\/p>\n Aquest projecte ha estat una forma emocionant de con\u00e8ixer principis cient\u00edfics com la f\u00edsica del moviment i l’energia, mentre ens divert\u00edem i treball\u00e0vem en equip. Ara ja sabem com construir i llan\u00e7ar un coet!<\/strong><\/p>\n V\u00cdDEO<\/a><\/p>\n Algunes fotos:<\/p>\n A la nostra escola, ens agrada aprendre a trav\u00e9s de l’experimentaci\u00f3, i aquesta vegada hem constru\u00eft el nostre propi coet! Us expliquem com ho hem fet pas a pas i qu\u00e8 hem apr\u00e8s durant aquest projecte. Pas 1: Preparaci\u00f3 de l’ampolla Per comen\u00e7ar, hem agafat dues ampolles de refresc buides. A la primera, hem marcat 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