{"id":484,"date":"2016-06-06T07:56:00","date_gmt":"2016-06-06T05:56:00","guid":{"rendered":"https:\/\/kids.esa.int\/gravity\/"},"modified":"2026-10-08T00:28:44","modified_gmt":"2026-10-07T22:28:44","slug":"gravity","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/sl\/gravity\/","title":{"rendered":"Gravitacija!"},"content":{"rendered":"<div class=\"lede\">\n<p>Si kdaj videl, kako sade\u017e ali predmet pade z drevesa? In si kdaj poskusil vr\u017eati kamen in opazovati, kako pada? Ta sila, ki stvari \u2018spu\u0161\u010da navzdol\u2019, se imenuje gravitacijska sila.<\/p>\n<\/div>\n<p>Zemlja nas nenehno privla\u010di s svojo gravitacijsko silo. To je razlog, zakaj vedno stojimo z nogami na tleh. Vendar pa nam ni treba biti v neposrednem stiku z Zemljo, da nas privla\u010di; zadostuje \u017ee, da nismo preve\u010d oddaljeni, da delujejo iste sile. Zato na\u0161 planet kro\u017ei okoli Sonca, Luna pa okoli Zemlje.<\/p>\n<p>Gravitacijska sila je odvisna od mase telesa. Gravitacijska sila med dvema telesom je sorazmerna z njunima masama in se zelo hitro zmanj\u0161a, takoj ko ju lo\u010dimo. Pravzaprav tudi mi privla\u010dimo telesa z \u2018na\u0161o\u2019 gravitacijsko silo, a smo prelahki, da bi opazili te u\u010dinke! Sonce pa je tako veliko, da nas lahko dr\u017ei blizu sebe, \u010deprav je tako dale\u010d stran. Tudi Luna izvaja svojo gravitacijsko silo; ker je manj\u0161a in la\u017eja od Zemlje, bi, \u010de bi se na njej lahko stehtali, ugotovili, da tehtamo pribli\u017eno \u0161estino na\u0161e te\u017ee na Zemlji.<\/p>\n<p>Lahko bi se vpra\u0161ali, zakaj Luna ne pade na Zemljo tako kot jabolko z drevesa. Razlog je v tem, da Luna nikoli ne miruje. Nenehno se giblje okoli nas. Brez zemeljske gravitacije bi preprosto odplul v vesolje. Ta kombinacija hitrosti in oddaljenosti od Zemlje omogo\u010da Luni, da je vedno v ravnovesju med padcem in pobegom. \u010ce bi bil hitrej\u0161i, bi pobegnil; \u010de bi bil po\u010dasnej\u0161i, bi padel!<\/p>\n<p>Rekli smo, da je sila te\u017enosti odvisna tudi od razdalje. \u010ce bi se dovolj oddaljili, bi se lahko izognili njenemu vplivu. Prav to posku\u0161amo dose\u010di z vesoljskimi plovili. Dosegli in presegli moramo tako imenovano \u2018begalno hitrost\u2019, ki zna\u0161a pribli\u017eno 11,2 km\/s (pri taki hitrosti bi se lahko iz Londona v New York preselili v samo desetih minutah!). Ko raketoplan dose\u017ee to hitrost, se lahko prosto giblje po Son\u010dnem sistemu.<\/p>\n<p>V vesoljski ladji, ki kro\u017ei v orbiti, ne \u010dutimo zemeljske gravitacije. Predmeti ne padajo, ampak lebdijo; \u010de sko\u010di\u0161 navzgor, se ne vrne\u0161 nazaj na tla. Enako se dogaja astronavtom, ko so na vesoljskih postajah, ki kro\u017eijo okoli Zemlje!<\/p>\n<nav class=\"related\" aria-label=\"Povezano\">\n<h2 class=\"related__heading\">Povezano<\/h2>\n<div class=\"grid related__grid\">\n<div class=\"grid-item\">\n<article class=\"card focuson agency\"><a class=\"card__link\" href=\"\/sl\/maanen_jorden_og_tyngdekraften2\/\"><\/p>\n<figure class=\"thumbnail\"><span class=\"dimmer\"><\/span><\/figure>\n<header class=\"entry\">\n<h3 class=\"heading\">danski<\/h3>\n<\/header>\n<p><\/a><\/article>\n<\/div>\n<div class=\"grid-item\">\n<article class=\"card focuson agency\"><a class=\"card__link\" href=\"\/sl\/de_maan_de_aarde_en_zwaartekracht\/\"><\/p>\n<figure class=\"thumbnail\"><span class=\"dimmer\"><\/span><\/figure>\n<header class=\"entry\">\n<h3 class=\"heading\">nizozem\u0161\u010dina<\/h3>\n<\/header>\n<p><\/a><\/article>\n<\/div>\n<div class=\"grid-item\">\n<article class=\"card focuson agency\"><a class=\"card__link\" href=\"\/sl\/la_lune_la_terre_et_la_gravite\/\"><\/p>\n<figure class=\"thumbnail\"><span class=\"dimmer\"><\/span><\/figure>\n<header class=\"entry\">\n<h3 class=\"heading\">franco\u0161\u010dina<\/h3>\n<\/header>\n<p><\/a><\/article>\n<\/div>\n<div class=\"grid-item\">\n<article class=\"card focuson agency\"><a class=\"card__link\" href=\"\/sl\/mond_erde_und_schwerkraft\/\"><\/p>\n<figure class=\"thumbnail\"><span class=\"dimmer\"><\/span><\/figure>\n<header class=\"entry\">\n<h3 class=\"heading\">nem\u0161\u010dina<\/h3>\n<\/header>\n<p><\/a><\/article>\n<\/div>\n<div class=\"grid-item\">\n<article class=\"card focuson agency\"><a class=\"card__link\" href=\"\/sl\/la_luna_la_terra_e_la_gravita\/\"><\/p>\n<figure class=\"thumbnail\"><span class=\"dimmer\"><\/span><\/figure>\n<header class=\"entry\">\n<h3 class=\"heading\">italijanski<\/h3>\n<\/header>\n<p><\/a><\/article>\n<\/div>\n<div class=\"grid-item\">\n<article class=\"card focuson agency\"><a class=\"card__link\" href=\"\/sl\/maanen_jorden_og_tyngdekraften\/\"><\/p>\n<figure class=\"thumbnail\"><span class=\"dimmer\"><\/span><\/figure>\n<header class=\"entry\">\n<h3 class=\"heading\">norve\u0161ki<\/h3>\n<\/header>\n<p><\/a><\/article>\n<\/div>\n<div class=\"grid-item\">\n<article class=\"card focuson agency\"><a class=\"card__link\" href=\"\/sl\/ksiezyc_ziemia_i_grawitacja\/\"><\/p>\n<figure class=\"thumbnail\"><span class=\"dimmer\"><\/span><\/figure>\n<header class=\"entry\">\n<h3 class=\"heading\">polj\u0161\u010dina<\/h3>\n<\/header>\n<p><\/a><\/article>\n<\/div>\n<div class=\"grid-item\">\n<article class=\"card focuson agency\"><a class=\"card__link\" href=\"\/sl\/la_luna_la_tierra_y_la_gravedad\/\"><\/p>\n<figure class=\"thumbnail\"><span class=\"dimmer\"><\/span><\/figure>\n<header class=\"entry\">\n<h3 class=\"heading\">\u0161pan\u0161\u010dina<\/h3>\n<\/header>\n<p><\/a><\/article>\n<\/div>\n<div class=\"grid-item\">\n<article class=\"card focuson agency\"><a class=\"card__link\" href=\"\/sl\/maanen_jorden_och_gravitation\/\"><\/p>\n<figure class=\"thumbnail\"><span class=\"dimmer\"><\/span><\/figure>\n<header class=\"entry\">\n<h3 class=\"heading\">\u0160ved\u0161\u010dina<\/h3>\n<\/header>\n<p><\/a><\/article>\n<\/div>\n<\/div>\n<\/nav>","protected":false},"excerpt":{"rendered":"<p>Have you ever seen a fruit or object falling from a tree? And have you ever tried to throw a stone and watch it fall? This force that \u2018brings down\u2019 [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"esa_banner_image":"https:\/\/www.esa.int\/var\/esa\/storage\/images\/esa_multimedia\/images\/2016\/06\/gravity_apple_newton\/17897755-2-eng-GB\/Gravity_apple_Newton.jpg","esa_banner_description":"","esa_banner_credit":"ESA","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2016\/06\/Gravity_apple_Newton","esa_external_url":"","esa_external_new_window":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":true},"categories":[10,11,19],"tags":[],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-484","post","type-post","status-publish","format-standard","hentry","category-learn","category-our-universe","category-story-of-the-universe"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kids.esa.int\/sl\/wp-json\/wp\/v2\/posts\/484","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kids.esa.int\/sl\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kids.esa.int\/sl\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/sl\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/sl\/wp-json\/wp\/v2\/comments?post=484"}],"version-history":[{"count":1,"href":"https:\/\/kids.esa.int\/sl\/wp-json\/wp\/v2\/posts\/484\/revisions"}],"predecessor-version":[{"id":1627,"href":"https:\/\/kids.esa.int\/sl\/wp-json\/wp\/v2\/posts\/484\/revisions\/1627"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/sl\/wp-json\/wp\/v2\/media?parent=484"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/sl\/wp-json\/wp\/v2\/categories?post=484"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/sl\/wp-json\/wp\/v2\/tags?post=484"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/sl\/wp-json\/wp\/v2\/panel?post=484"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/sl\/wp-json\/wp\/v2\/language?post=484"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/sl\/wp-json\/wp\/v2\/age?post=484"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/sl\/wp-json\/wp\/v2\/duration?post=484"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/sl\/wp-json\/wp\/v2\/resource_type?post=484"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/sl\/wp-json\/wp\/v2\/audience?post=484"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/sl\/wp-json\/wp\/v2\/wf_post_folders?post=484"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}