{"id":1850,"date":"2024-03-12T16:09:56","date_gmt":"2024-03-12T14:09:56","guid":{"rendered":"https:\/\/cedra.academy\/?p=1850"},"modified":"2024-06-20T16:33:43","modified_gmt":"2024-06-20T13:33:43","slug":"legea-atractiei-universale","status":"publish","type":"post","link":"https:\/\/cedra.academy\/?p=1850","title":{"rendered":"Legea atrac\u0163iei universale"},"content":{"rendered":"\n<p><strong>Legea atrac\u021biei universale<\/strong>, cunoscut\u0103 \u0219i sub denumirea de Legea gravita\u021biei universale, este un principiu fundamental al fizicii, formulat de Sir Isaac Newton \u00een secolul al XVII-lea. Aceasta lege explic\u0103 for\u021ba de atrac\u021bie care exist\u0103 \u00eentre dou\u0103 mase \u00een univers. Conform acestei legi, orice dou\u0103 obiecte din univers se atrag reciproc cu o for\u021b\u0103 care este direct propor\u021bional\u0103 cu produsul maselor lor \u0219i invers propor\u021bional\u0103 cu p\u0103tratul distan\u021bei dintre ele. Formula matematic\u0103 a acestei legi este: <strong>( F = G \\frac{m_1 m_2}{r^2} )<\/strong>, unde <strong>( F )<\/strong> este for\u021ba de atrac\u021bie, <strong>( G )<\/strong> este constanta gravita\u021bional\u0103,<strong> ( m_1 ) \u0219i ( m_2 )<\/strong> sunt masele celor dou\u0103 obiecte, iar<strong> ( r )<\/strong> este distan\u021ba dintre centrele lor de mas\u0103.<\/p>\n\n\n\n<p>Aceast\u0103 lege a avut un impact profund asupra modului \u00een care \u00een\u021belegem universul. \u00cenainte de Newton, explica\u021biile despre mi\u0219carea corpurilor cere\u0219ti erau bazate pe modele ptolemaice \u0219i kepleriene, care de\u0219i precise, nu ofereau o explica\u021bie fundamental\u0103 a for\u021belor implicate. Newton a revolu\u021bionat aceste concep\u021bii, oferind o teorie unificatoare care explic\u0103 at\u00e2t mi\u0219carea planetelor \u00een jurul Soarelui, c\u00e2t \u0219i c\u0103derea obiectelor pe P\u0103m\u00e2nt. Descoperirea legii atrac\u021biei universale a permis oamenilor de \u0219tiin\u021b\u0103 s\u0103 calculeze cu exactitate traiectoriile obiectelor cere\u0219ti \u0219i s\u0103 prezic\u0103 evenimente astronomice cu o precizie incredibil\u0103.<\/p>\n\n\n\n<p>\u00cen practic\u0103, legea atrac\u021biei universale explic\u0103 de ce obiectele cad la p\u0103m\u00e2nt atunci c\u00e2nd sunt l\u0103sate libere \u0219i de ce avem greutate. Aceasta este for\u021ba care \u021bine planetele pe orbitele lor \u0219i care face ca mareele s\u0103 apar\u0103 pe P\u0103m\u00e2nt. Gravita\u021bia joac\u0103, de asemenea, un rol crucial \u00een formarea stelelor \u0219i a galaxiilor, fiind for\u021ba care atrage materie \u0219i energie pentru a forma structuri complexe \u00een univers.<\/p>\n\n\n\n<p><strong>Legea atrac\u021biei universale a lui Newton<\/strong> este unul dintre pilonii fundamentali ai fizicii clasice. Aceasta nu numai c\u0103 a schimbat modul \u00een care \u00een\u021belegem mi\u0219carea \u0219i for\u021bele din natur\u0103, dar a deschis \u0219i calea pentru descoperiri ulterioare \u00een fizic\u0103, inclusiv teoria relativit\u0103\u021bii a lui Einstein, care extinde \u0219i rafineaz\u0103 concep\u021biile newtoniene despre gravita\u021bie. Legea atrac\u021biei universale r\u0103m\u00e2ne una dintre cele mai importante descoperiri \u0219tiin\u021bifice, influen\u021b\u00e2nd at\u00e2t g\u00e2ndirea \u0219tiin\u021bific\u0103, c\u00e2t \u0219i tehnologia modern\u0103.<\/p>\n\n\n\n<div class=\"wp-block-file\"><a id=\"wp-block-file--media-0f7976b1-2ff0-4f39-8d9e-7644099c2e6e\" href=\"https:\/\/cedra.academy\/wp-content\/uploads\/2024\/06\/Legea-atractiei-universale-a-lui-Newton.ppt\"><strong>PPT  Legea   atrac\u021biei   universale  a   lui  Newton<\/strong>   <\/a><a href=\"https:\/\/cedra.academy\/wp-content\/uploads\/2024\/06\/Legea-atractiei-universale-a-lui-Newton.ppt\" class=\"wp-block-file__button wp-element-button\" download aria-describedby=\"wp-block-file--media-0f7976b1-2ff0-4f39-8d9e-7644099c2e6e\">Descarc\u0103<\/a><\/div>\n\n\n\n<figure class=\"wp-block-gallery has-nested-images columns-default is-cropped wp-block-gallery-1 is-layout-flex wp-block-gallery-is-layout-flex\">\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" loading=\"lazy\" width=\"1024\" height=\"768\" data-id=\"1853\" src=\"https:\/\/cedra.academy\/wp-content\/uploads\/2024\/06\/3-Legea-atractiei-universale.jpg\" alt=\"\" class=\"wp-image-1853\" srcset=\"https:\/\/cedra.academy\/wp-content\/uploads\/2024\/06\/3-Legea-atractiei-universale.jpg 1024w, https:\/\/cedra.academy\/wp-content\/uploads\/2024\/06\/3-Legea-atractiei-universale-300x225.jpg 300w, https:\/\/cedra.academy\/wp-content\/uploads\/2024\/06\/3-Legea-atractiei-universale-768x576.jpg 768w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">F este marimea for\u0163ei de atractie dintre cele dou\u0103 corpuri punctiforme, K este un coeficient de propor\u0163ionalitate numit constanta atrac\u0163iei universale, m1 este masa primului corp, m2 este masa celui de al II-lea corp, r este distan\u0163a dintre cele dou\u0103 corpuri. Constanta atractiei universale k a fost m\u0103surat\u0103 pentru prima dat\u0103 cu acurate\u0163e prin experimentul Cavendish, de c\u0103tre savantul britanic Henry Cavendish, \u00een A fost prima verificare experimental\u0103, \u00een laborator, a teoriei gravita\u0163iei, la 111 ani dup\u0103 ce Isaac Newton publicase Principiile matematice ale filozofiei naturale \u015fi la 71 de ani dup\u0103 moartea lui Newton. Este remarcabil faptul c\u0103 Newton nu a putut folosi \u00een calculele sale valoarea lui K, el calcul\u00e2nd o for\u0163\u0103 numai relativ la alt\u0103 for\u0163\u0103.<\/figcaption><\/figure>\n<\/figure>\n\n\n\n<figure class=\"wp-block-gallery has-nested-images columns-default is-cropped wp-block-gallery-3 is-layout-flex wp-block-gallery-is-layout-flex\">\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" loading=\"lazy\" width=\"283\" height=\"178\" data-id=\"1857\" src=\"https:\/\/cedra.academy\/wp-content\/uploads\/2024\/06\/33A-Legea-atractiei-universale-a-lui-Newton.jpg\" alt=\"\" class=\"wp-image-1857\"\/><\/figure>\n<\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Legea atrac\u021biei universale, cunoscut\u0103 \u0219i sub denumirea de Legea gravita\u021biei universale, este un principiu fundamental al fizicii, formulat de Sir Isaac Newton \u00een secolul al XVII-lea. Aceasta lege explic\u0103 for\u021ba [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":1851,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[18,10],"tags":[],"_links":{"self":[{"href":"https:\/\/cedra.academy\/index.php?rest_route=\/wp\/v2\/posts\/1850"}],"collection":[{"href":"https:\/\/cedra.academy\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/cedra.academy\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/cedra.academy\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/cedra.academy\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1850"}],"version-history":[{"count":2,"href":"https:\/\/cedra.academy\/index.php?rest_route=\/wp\/v2\/posts\/1850\/revisions"}],"predecessor-version":[{"id":1858,"href":"https:\/\/cedra.academy\/index.php?rest_route=\/wp\/v2\/posts\/1850\/revisions\/1858"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cedra.academy\/index.php?rest_route=\/wp\/v2\/media\/1851"}],"wp:attachment":[{"href":"https:\/\/cedra.academy\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1850"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cedra.academy\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1850"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cedra.academy\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1850"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}