{"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\/ro\/what_is_gravity\/","title":{"rendered":"Ce este gravita\u021bia?"},"content":{"rendered":"
\n

Te-ai \u00eentrebat vreodat\u0103 de ce, indiferent c\u00e2t de sus sari, tot cazi la p\u0103m\u00e2nt cu un zgomot puternic? Oamenii \u00ee\u0219i puneau aceea\u0219i \u00eentrebare \u0219i acum 340 de ani. Atunci, un om de \u0219tiin\u021b\u0103 britanic pe nume Isaac Newton a descoperit for\u021ba gravita\u021bional\u0103.<\/p>\n<\/div>\n

128125 Povestea spune c\u0103 Isaac se afla \u00een gr\u0103dina sa c\u00e2nd un m\u0103r i-a c\u0103zut \u00een cap. \u00cen timp ce \u00ee\u0219i freca v\u00e2n\u0103taia, a \u00eenceput s\u0103 se \u00eentrebe de ce m\u0103rul l-a lovit pe el \u0219i nu s-a ridicat \u00een schimb spre cer.<\/p>\n

Newton a ajuns la concluzia c\u0103 o for\u021b\u0103 invizibil\u0103 trebuie s\u0103 atrag\u0103 m\u0103rul spre P\u0103m\u00e2nt. El a numit aceast\u0103 for\u021b\u0103 \u201cgravita\u021bie\u201d \u2013 de la cuv\u00e2ntul latin \u201cgravitas\u201d, care \u00eenseamn\u0103 \u201cgreutate\u201d.<\/p>\n

\"Newton's
Tunul lui Newton<\/figcaption><\/figure>\n

Newton \u0219i-a dat seama c\u0103 fiecare obiect din Univers atrage orice alt obiect din Univers. Chiar \u0219i un m\u0103r exercit\u0103 o for\u021b\u0103 de atrac\u021bie u\u0219oar\u0103 asupra tuturor obiectelor din jurul s\u0103u.<\/p>\n

Gravita\u021bia este cea care men\u021bine Luna pe orbita \u00een jurul P\u0103m\u00e2ntului \u0219i tot gravita\u021bia este cea care permite Soarelui s\u0103-\u0219i \u021bin\u0103 \u00eempreun\u0103 familia de planete. Atrac\u021bia Soarelui \u0219i a Lunii determin\u0103, de asemenea, mareele oceanelor P\u0103m\u00e2ntului.<\/p>\n

Cu toate acestea, intensitatea gravita\u021biei depinde de dimensiunea \u0219i densitatea unui obiect \u2013 ceea ce oamenii de \u0219tiin\u021b\u0103 numesc \u201cmasa\u201d acestuia. Gravita\u021bia micu\u021bului m\u0103r este prea slab\u0103 pentru a \u00eenvinge atrac\u021bia uria\u0219ei P\u0103m\u00e2nturi, a\u0219a c\u0103 acesta cade spre centrul planetei.<\/p>\n

Atrac\u021bia gravita\u021bional\u0103 exercitat\u0103 de un obiect scade odat\u0103 cu distan\u021ba fa\u021b\u0103 de acesta. Un alpinist aflat pe v\u00e2rful muntelui Everest c\u00e2nt\u0103re\u0219te pu\u021bin mai pu\u021bin dec\u00e2t la nivelul m\u0103rii. Dac\u0103 o nav\u0103 spa\u021bial\u0103 se \u00eendep\u0103rteaz\u0103 suficient de mult de P\u0103m\u00e2nt, va reu\u0219i \u00een cele din urm\u0103 s\u0103 scape complet de atrac\u021bia gravita\u021bional\u0103 a planetei.<\/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\/ro\/wp-json\/wp\/v2\/posts\/35","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kids.esa.int\/ro\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kids.esa.int\/ro\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/ro\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/ro\/wp-json\/wp\/v2\/comments?post=35"}],"version-history":[{"count":4,"href":"https:\/\/kids.esa.int\/ro\/wp-json\/wp\/v2\/posts\/35\/revisions"}],"predecessor-version":[{"id":4271,"href":"https:\/\/kids.esa.int\/ro\/wp-json\/wp\/v2\/posts\/35\/revisions\/4271"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/ro\/wp-json\/wp\/v2\/media?parent=35"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/ro\/wp-json\/wp\/v2\/categories?post=35"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/ro\/wp-json\/wp\/v2\/tags?post=35"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/ro\/wp-json\/wp\/v2\/panel?post=35"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/ro\/wp-json\/wp\/v2\/language?post=35"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/ro\/wp-json\/wp\/v2\/age?post=35"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/ro\/wp-json\/wp\/v2\/duration?post=35"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/ro\/wp-json\/wp\/v2\/resource_type?post=35"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/ro\/wp-json\/wp\/v2\/audience?post=35"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/ro\/wp-json\/wp\/v2\/wf_post_folders?post=35"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}