{"id":35,"date":"2005-06-30T09:17:00","date_gmt":"2005-06-30T07:17:00","guid":{"rendered":"https:\/\/kids.esa.int\/what_is_gravity\/"},"modified":"2026-10-08T00:23:19","modified_gmt":"2026-10-07T22:23:19","slug":"what_is_gravity","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/nb\/what_is_gravity\/","title":{"rendered":"Hva er tyngdekraften?"},"content":{"rendered":"
\n

Har du noen gang lurt p\u00e5 hvorfor du alltid faller ned p\u00e5 bakken med et smell, uansett hvor h\u00f8yt du hopper? Folk stilte seg det samme sp\u00f8rsm\u00e5let for 340 \u00e5r siden. Da oppdaget en britisk vitenskapsmann ved navn Isaac Newton tyngdekraften.<\/p>\n<\/div>\n

128125 Historien forteller hvordan Isak var i hagen sin da et eple falt ned p\u00e5 hodet hans. Mens han gned seg p\u00e5 bl\u00e5merket, begynte han \u00e5 undre seg over hvorfor eplet hadde truffet ham og ikke i stedet blitt skutt oppover.<\/p>\n

Newton kom frem til at det m\u00e5tte v\u00e6re en usynlig kraft som trakk eplet mot Jorden. Han kalte denne kraften \u201ctyngdekraften\u201d \u2013 fra det latinske ordet \u201cgravitas\u201d, som betyr \u201cvekt\u201d.<\/p>\n

\"Newton's
Newtons kanon<\/figcaption><\/figure>\n

Newton inns\u00e5 at hvert eneste objekt i universet tiltrekker seg alle andre objekter i universet. Selv et eple ut\u00f8ver en svak tiltrekningskraft p\u00e5 alt rundt seg.<\/p>\n

Det er tyngdekraften som holder M\u00e5nen i bane rundt Jorden, og det er tyngdekraften som gj\u00f8r at Solen kan holde p\u00e5 sin familie av planeter. Tiltrekningskraften fra Solen og M\u00e5nen for\u00e5rsaker ogs\u00e5 tidevannet i Jordens hav.<\/p>\n

Tyngdekraften avhenger imidlertid av objektets st\u00f8rrelse og tetthet \u2013 det forskerne kaller \u201cmassen\u201d. Det lille eplet har for svak tyngdekraft til \u00e5 overvinne tiltrekningen fra den enorme jorden, og derfor faller det mot planetens sentrum.<\/p>\n

Et objekts tyngdekraft avtar med avstanden fra det. En klatrer p\u00e5 toppen av Mount Everest veier litt mindre enn ved havniv\u00e5. Hvis et romskip beveger seg langt nok bort fra Jorden, vil det til slutt slippe helt ut av planetens tyngdekraft.<\/p>","protected":false},"excerpt":{"rendered":"

Have you ever wondered why you always fall back to the ground with a bump, no matter how high you jump? People were asking the same question 340 years ago. […]<\/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\/2002\/01\/sir_isaac_newton_1642-17272\/17864713-3-eng-GB\/Sir_Isaac_Newton_1642-1727.jpg","esa_banner_description":"Sir Isaac Newton, 1642-1727","esa_banner_credit":"Isaac Newton Institute for Mathematical Studies","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2002\/01\/Sir_Isaac_Newton_1642-17272","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":[2],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-35","post","type-post","status-publish","format-standard","hentry","category-learn","category-our-universe","category-story-of-the-universe","tag-background-article"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/posts\/35","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/comments?post=35"}],"version-history":[{"count":4,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/posts\/35\/revisions"}],"predecessor-version":[{"id":4271,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/posts\/35\/revisions\/4271"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/media?parent=35"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/categories?post=35"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/tags?post=35"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/panel?post=35"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/language?post=35"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/age?post=35"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/duration?post=35"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/resource_type?post=35"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/audience?post=35"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/wf_post_folders?post=35"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}