{"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\/sv\/what_is_gravity\/","title":{"rendered":"Vad \u00e4r gravitation?"},"content":{"rendered":"
\n

Har du n\u00e5gonsin undrat varf\u00f6r du alltid landar med en sm\u00e4ll, oavsett hur h\u00f6gt du hoppar? Folk st\u00e4llde sig samma fr\u00e5ga f\u00f6r 340 \u00e5r sedan. D\u00e5 uppt\u00e4ckte en brittisk forskare vid namn Isaac Newton tyngdkraften.<\/p>\n<\/div>\n

128125 Ber\u00e4ttelsen handlar om hur Isaac befann sig i sin tr\u00e4dg\u00e5rd n\u00e4r ett \u00e4pple f\u00f6ll p\u00e5 hans huvud. Medan han gnuggade sitt bl\u00e5m\u00e4rke b\u00f6rjade han undra varf\u00f6r \u00e4pplet hade tr\u00e4ffat honom och inte ist\u00e4llet flugit upp\u00e5t.<\/p>\n

Newton kom fram till att det m\u00e5ste finnas n\u00e5gon osynlig kraft som drar \u00e4pplet mot jorden. Han kallade denna kraft f\u00f6r \u201cgravitation\u201d \u2013 fr\u00e5n det latinska ordet \u201cgravitas\u201d, som betyder \u201cvikt\u201d.<\/p>\n

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

Newton ins\u00e5g att varje f\u00f6rem\u00e5l i universum drar till sig alla andra f\u00f6rem\u00e5l i universum. Till och med ett \u00e4pple ut\u00f6var en svag dragkraft p\u00e5 allt omkring sig.<\/p>\n

Det \u00e4r gravitationen som h\u00e5ller m\u00e5nen i omloppsbana runt jorden, och det \u00e4r gravitationen som g\u00f6r att solen kan h\u00e5lla ihop sin planetfamilj. Solens och m\u00e5nens dragningskraft orsakar ocks\u00e5 tidvattnet i jordens hav.<\/p>\n

Gravitationens styrka beror dock p\u00e5 ett objekts storlek och densitet \u2013 det som forskarna kallar dess \u201cmassa\u201d. Det lilla \u00e4pplets gravitation \u00e4r f\u00f6r svag f\u00f6r att \u00f6vervinna den enorma jordens dragningskraft, s\u00e5 det faller mot planetens centrum.<\/p>\n

Ett objekts gravitationskraft avtar med avst\u00e5ndet fr\u00e5n det. En bergskl\u00e4ttrare p\u00e5 toppen av Mount Everest v\u00e4ger n\u00e5got mindre \u00e4n vid havsniv\u00e5. Om ett rymdskepp f\u00e4rdas tillr\u00e4ckligt l\u00e5ngt bort fr\u00e5n jorden kommer det s\u00e5 sm\u00e5ningom att helt undkomma planetens gravitationskraft.<\/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\/sv\/wp-json\/wp\/v2\/posts\/35","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/comments?post=35"}],"version-history":[{"count":4,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/posts\/35\/revisions"}],"predecessor-version":[{"id":4271,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/posts\/35\/revisions\/4271"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/media?parent=35"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/categories?post=35"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/tags?post=35"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/panel?post=35"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/language?post=35"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/age?post=35"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/duration?post=35"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/resource_type?post=35"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/audience?post=35"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/sv\/wp-json\/wp\/v2\/wf_post_folders?post=35"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}