{"id":3991,"date":"2018-06-25T04:51:41","date_gmt":"2018-06-25T04:51:41","guid":{"rendered":"http:\/\/fisicaevestibular.com.br\/novo\/?page_id=3991"},"modified":"2024-08-22T12:55:05","modified_gmt":"2024-08-22T12:55:05","slug":"dinamica-2-segunda-lei-de-newton","status":"publish","type":"page","link":"https:\/\/fisicaevestibular.com.br\/novo\/formulario\/dinamica-2-segunda-lei-de-newton\/","title":{"rendered":"Din\u00e2mica 2 – Segunda Lei de Newton"},"content":{"rendered":"

Formul\u00e1rio completo de F\u00edsica com informa\u00e7\u00f5es \u00fateis <\/b><\/span><\/span><\/span><\/p>\n

(dicas para vestibulares)<\/b><\/span><\/span><\/span><\/p>\n

Din\u00e2mica 2<\/b><\/span><\/span><\/span><\/p>\n

Segunda lei de Newton ou <\/b><\/span><\/span><\/span><\/p>\n

Princ\u00edpio Fundamental da Din\u00e2mica<\/b><\/span><\/span><\/span><\/p>\n

Podemos definir o\u00a0<\/b><\/span><\/span>Princ\u00edpio Fundamental da Din\u00e2mica ou segunda lei de Newton<\/b><\/span><\/span>\u00a0do seguinte<\/b><\/span><\/span><\/span><\/span><\/p>\n

modo:<\/b><\/span><\/span><\/span><\/span><\/p>\n

<\/p>\n

Matematicamente<\/b><\/span><\/span><\/span>:<\/b><\/span><\/span><\/span><\/span><\/span><\/p>\n

<\/p>\n

Significado de F = 1 N<\/b><\/span><\/span><\/span><\/span><\/p>\n

Considerando<\/b><\/span><\/span>\u00a0<\/b><\/span><\/span>m = 1 kg<\/b><\/span><\/span>,\u00a0<\/b><\/span><\/span>a = 1m\/s2<\/b><\/span><\/span>\u00a0e\u00a0<\/b><\/span><\/span>F = 1N<\/b><\/span><\/span>, <\/b><\/span><\/span>podemos<\/b><\/span><\/span>\u00a0<\/b><\/span><\/span>definir 1N\u00a0<\/b><\/span><\/span>como send<\/b><\/span><\/span>o <\/b><\/span><\/span>a\u00a0<\/b><\/span><\/span>intensidade da for\u00e7a\u00a0resultante\u00a0que,\u00a0aplicada sobre um corpo de massa 1 kg,\u00a0<\/b><\/span><\/span>produz no mesmo\u00a0<\/b><\/span><\/span>uma acelera\u00e7\u00e3o de 1m\/s<\/b><\/span><\/span>2<\/b><\/span><\/sup><\/span>.<\/b><\/span><\/span><\/span><\/span><\/p>\n

Informa\u00e7\u00f5es \u00fateis <\/b><\/span><\/span><\/span>(dicas para vestibulares)<\/b><\/span><\/span><\/span><\/p>\n

<\/p>\n

Observe na\u00a0<\/b><\/span><\/span>lei fundamental da Din\u00e2mica (F = m.a)\u00a0<\/b><\/span><\/span>que, <\/b><\/span><\/span>quanto\u00a0<\/b><\/span><\/span>maior a massa<\/b><\/span><\/span> do corpo, maior<\/b><\/span><\/span> ser\u00e1 <\/b><\/span><\/span>sua\u00a0in\u00e9rcia,<\/b><\/span><\/span>\u00a0<\/b><\/span><\/span>ou seja,\u00a0<\/b><\/span><\/span>devemos aplicar uma\u00a0for\u00e7a resultante maior para\u00a0acelerar ou <\/b><\/span><\/span><\/span><\/span><\/p>\n

<\/p>\n

retardar\u00a0um caminh\u00e3o carregado <\/b><\/span><\/span>(maior massa) do que <\/b><\/span><\/span>acelerar ou retardar o mesmo caminh\u00e3o descarregado <\/b><\/span><\/span>(menor massa).<\/b><\/span><\/span><\/span><\/span><\/p>\n

<\/p>\n

A\u00a0<\/b><\/span><\/span>for\u00e7a\u00a0<\/b><\/span><\/span>\u00a0da express\u00e3o\u00a0<\/b><\/span><\/span>\u00e9 a\u00a0<\/b><\/span><\/span>for\u00e7a resultante,<\/b><\/span><\/span> <\/b>que \u00e9 a\u00a0<\/b><\/span><\/span>soma vetorial\u00a0de todas as for\u00e7as <\/b><\/span><\/span><\/span><\/span><\/p>\n

<\/p>\n

que agem sobre o corpo.<\/b><\/span><\/span><\/span><\/span><\/p>\n

<\/p>\n

Um\u00a0<\/b><\/span><\/span>dinam\u00f4metro <\/b><\/span><\/span>(mede intensidade de for\u00e7as)<\/b><\/span><\/span> ideal\u00a0inserido numa\u00a0corda ideal\u00a0<\/b><\/span><\/span>(inextens\u00edvel e de <\/b><\/span><\/span><\/span><\/span><\/p>\n

<\/p>\n

massa desprez\u00edvel), indica\u00a0a intensidade da for\u00e7a de tra\u00e7\u00e3o\u00a0numa das extremidades\u00a0<\/b><\/span><\/span>da mesma (veja as duas figuras acima).<\/b><\/span><\/span><\/span><\/span><\/p>\n

Se <\/b><\/span><\/span>tivermos\u00a0dois ou mais dinam\u00f4metros\u00a0ideais\u00a0ligados\u00a0conforme a figura abaixo <\/b><\/span><\/span>e na <\/b><\/span><\/span>extremidade<\/b><\/span><\/span><\/span><\/span><\/p>\n

<\/p>\n

livre do dinam\u00f4metro da direita aplicarmos uma for\u00e7a, por exemplo de\u00a020N,\u00a0cada dinam\u00f4metro indicar\u00e1 20N.<\/b><\/span><\/span><\/span><\/span><\/p>\n

<\/p>\n

Equa\u00e7\u00f5es da Cinem\u00e1tica que em muitos exerc\u00edcios s\u00e3o utilizadas como <\/b><\/span><\/span><\/span>complementos da Segunda Lei de Newton<\/b><\/span><\/span><\/span><\/span><\/span><\/p>\n

<\/p>\n","protected":false},"excerpt":{"rendered":"

Formul\u00e1rio completo de F\u00edsica com informa\u00e7\u00f5es \u00fateis (dicas para vestibulares) Din\u00e2mica 2 Segunda lei de Newton ou Princ\u00edpio Fundamental da Din\u00e2mica Podemos definir o\u00a0Princ\u00edpio Fundamental da Din\u00e2mica ou segunda lei de Newton\u00a0do seguinte modo: Matematicamente: Significado de F = 1 N Considerando\u00a0m = 1 kg,\u00a0a = 1m\/s2\u00a0e\u00a0F = 1N, podemos\u00a0definir 1N\u00a0como sendo a\u00a0intensidade da for\u00e7a\u00a0resultante\u00a0que,\u00a0aplicada sobre um corpo de massa<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":3987,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"class_list":["post-3991","page","type-page","status-publish","hentry"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/3991","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/comments?post=3991"}],"version-history":[{"count":1,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/3991\/revisions"}],"predecessor-version":[{"id":3992,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/3991\/revisions\/3992"}],"up":[{"embeddable":true,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/3987"}],"wp:attachment":[{"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/media?parent=3991"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}