{"id":9499,"date":"2018-03-14T01:16:19","date_gmt":"2018-03-14T00:16:19","guid":{"rendered":"http:\/\/www.gymhorice.cz\/?p=9499"},"modified":"2018-03-31T01:20:59","modified_gmt":"2018-03-31T00:20:59","slug":"gravitace","status":"publish","type":"post","link":"https:\/\/www.gymhorice.cz\/?p=9499","title":{"rendered":"Gravitace"},"content":{"rendered":"

Jednou jsem \u0161la po \u0161kole parkem a vid\u011bla padat list. Pro n\u00e1s tak norm\u00e1ln\u00ed v\u011bc. Kolik ale g\u00e9ni\u016f si nad t\u00edm l\u00e1malo hlavu. Prvn\u00ed, kdo m\u011b napadl, byl Isaac Newton. Akor\u00e1t, \u017ee on to m\u011bl s jablkem. Cht\u011bla jsem zjistit v\u00edc a tak se pono\u0159ila do t\u00e9matu. Hned na m\u011b vysko\u010dila prvn\u00ed ot\u00e1zka\u2026
\nCo je to gravitace?<\/strong> Je to silov\u00e9 p\u016fsoben\u00ed mezi t\u011blesy. Ale pozor! Gravitace je v\u017edy p\u0159ita\u017eliv\u00e1 a tak\u00e9 z\u00e1vis\u00ed na hmotnosti. Ka\u017ed\u00e9 hmotn\u00e9 t\u011bleso m\u00e1 gravita\u010dn\u00ed pole. V\u011bd\u011bli jste, \u017ee kles\u00e1n\u00ed a zvy\u0161ov\u00e1n\u00ed mo\u0159sk\u00e9 hladiny je v\u00fdsledkem gravita\u010dn\u00ed s\u00edly M\u011bs\u00edce a Slunce?
\nCo jsou to vlastn\u011b slapov\u00e9 jevy?<\/strong> P\u0159edstavuje zvy\u0161ov\u00e1n\u00ed a kles\u00e1n\u00ed mo\u0159sk\u00e9 hladiny p\u016fsoben\u00edm slapov\u00e9 s\u00edly. Jestli jste reagovali takhle\u2026
\nSlapov\u00e1 s\u00edla\u2026 co to je?<\/strong> Snadn\u00e1 pomoc. Je to efekt gravita\u010dn\u00ed s\u00edly, dosah t\u00e9to s\u00edly je nekone\u010dn\u00fd.
\nCo je to gravita\u010dn\u00ed pole?<\/strong> Je to prostor kolem t\u011blesa, ve kter\u00e9m se projevuje p\u016fsoben\u00ed gravita\u010dn\u00ed s\u00edly.
\nJak\u00e9 jsou jeho druhy?<\/strong>
\n1.T\u00edhov\u00e9 pole: vznik\u00e1 v okol\u00ed rotuj\u00edc\u00edho hmotn\u00e9ho t\u011blesa
\n2.Homogenn\u00ed gravita\u010dn\u00ed pole: ve v\u0161ech jeho m\u00edstech je gravitace stejn\u00e1
\n3.Radi\u00e1ln\u00ed pole: je kolem hmotn\u00e9ho t\u011blesa, sl\u00e1bne, kdy\u017e se od t\u011blesa vzdalujeme (Zem\u011b)
\nTak douf\u00e1m, \u017ee jste porozum\u011bli t\u00e9 teoretick\u00e9 \u010d\u00e1sti\u2026 Co by v\u00e1s je\u0161t\u011b zaj\u00edmalo\u2026 \u00c1\u00e1\u00e1!
\nCo t\u0159eba historie\u2026 Prvn\u00ed experimenty s gravitac\u00ed provedl Galileo Galilei. Tak\u00e9 objevil z\u00e1kladn\u00ed z\u00e1kony t\u011bchto pohyb\u016f (nap\u0159. pro vodorovn\u00fd pohyb). I dal\u0161\u00ed velik\u00e1ni p\u0159isp\u011bli k pozn\u00e1n\u00ed (J. Kepler,Tycho de Brahe).
\nAle prvn\u00ed univerz\u00e1ln\u00ed z\u00e1kon objevil I. Newton.<\/strong> Jeho z\u00e1kon zn\u011bl: Ka\u017ed\u00e1 dv\u011b hmotn\u00e1 t\u011blesa , kter\u00e1 m\u016f\u017eeme dostate\u010dn\u011b p\u0159esn\u011b aproximovat body, nebo jsou sf\u00e9ricky symetrick\u00e1, na sebe p\u016fsob\u00ed gravita\u010dn\u00ed silou p\u0159\u00edmo \u00fam\u011brnou hmotnostem t\u011bles a nep\u0159\u00edmo \u00fam\u011brnou \u010dtverci jejich vzd\u00e1lenosti.<\/em>
\nTak jsme n\u011bco \u0159ekli o gravitaci Zem\u011b. A co M\u011bs\u00edc?<\/strong> Nebylo by mu smutno? Tak ho taky zm\u00edn\u00edm. Sice je od n\u00e1s 384 403 km, ale i tak! M\u011bs\u00edc m\u00e1 toti\u017e mnohem men\u0161\u00ed gravita\u010dn\u00ed pole, i proto se tam v\u0161e skoro vzn\u00e1\u0161\u00ed. Podle m\u011b si tam \u010dlov\u011bk p\u0159ijde svobodn\u011bj\u0161\u00ed.<\/p>\n

Pro\u010d jsme si vybrala pr\u00e1v\u011b gravitaci?<\/strong> Proto\u017ee je v\u0161ude kolem n\u00e1s. Doprov\u00e1z\u00ed n\u00e1s na cest\u011b \u017eivotem, je to na\u0161e st\u00e1l\u00e1 kamar\u00e1dka. \u0158ekla bych, \u017ee j\u00ed nev\u011bnujeme dostate\u010dnou pozornost. Jako v\u0161emu d\u016fle\u017eit\u00e9mu\u2026 Tak\u017ee chci na v\u00e1s, kdo si toto \u010dtete, apelovat \u2013 pros\u00edm, va\u017ete si j\u00ed.
\nD\u00edky n\u00ed m\u00e1me nohy pevn\u011b na (Z)zemi!!!<\/p>\n

Lea Anna Ouzk\u00e1, 1.A<\/p>\n","protected":false},"excerpt":{"rendered":"

Jednou jsem \u0161la po \u0161kole parkem a vid\u011bla padat list. Pro n\u00e1s tak norm\u00e1ln\u00ed v\u011bc. Kolik ale g\u00e9ni\u016f si nad t\u00edm l\u00e1malo hlavu. Prvn\u00ed, kdo m\u011b napadl, byl Isaac Newton. Akor\u00e1t, \u017ee on to m\u011bl s jablkem. Cht\u011bla jsem zjistit v\u00edc a tak se pono\u0159ila do t\u00e9matu. Hned na m\u011b vysko\u010dila prvn\u00ed ot\u00e1zka\u2026 Co … p\u0159e\u010d\u00edst v\u0161e<\/a><\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"ngg_post_thumbnail":0,"footnotes":""},"categories":[44],"tags":[45],"class_list":["post-9499","post","type-post","status-publish","format-standard","hentry","category-ze-supliku","tag-ze-supliku"],"_links":{"self":[{"href":"https:\/\/www.gymhorice.cz\/index.php?rest_route=\/wp\/v2\/posts\/9499","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.gymhorice.cz\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.gymhorice.cz\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.gymhorice.cz\/index.php?rest_route=\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/www.gymhorice.cz\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=9499"}],"version-history":[{"count":1,"href":"https:\/\/www.gymhorice.cz\/index.php?rest_route=\/wp\/v2\/posts\/9499\/revisions"}],"predecessor-version":[{"id":9501,"href":"https:\/\/www.gymhorice.cz\/index.php?rest_route=\/wp\/v2\/posts\/9499\/revisions\/9501"}],"wp:attachment":[{"href":"https:\/\/www.gymhorice.cz\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=9499"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.gymhorice.cz\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=9499"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.gymhorice.cz\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=9499"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}