{"id":3995,"date":"2018-06-25T04:53:17","date_gmt":"2018-06-25T04:53:17","guid":{"rendered":"http:\/\/fisicaevestibular.com.br\/novo\/?page_id=3995"},"modified":"2024-08-22T12:58:16","modified_gmt":"2024-08-22T12:58:16","slug":"dinamica-4-tipos-de-forca","status":"publish","type":"page","link":"https:\/\/fisicaevestibular.com.br\/novo\/formulario\/dinamica-4-tipos-de-forca\/","title":{"rendered":"Din\u00e2mica 4 – Tipos de For\u00e7a"},"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 4<\/b><\/span><\/span><\/span><\/p>\n

Tipos de For\u00e7as<\/b><\/span><\/span><\/span><\/span><\/span><\/p>\n

<\/p>\n

<\/p>\n

apoio B tamb\u00e9m para a direita<\/b><\/span><\/span>,\u00a0<\/b><\/span><\/span>aplicando ao apoio uma for\u00e7a<\/b><\/span><\/span>\u00a0.<\/b><\/span><\/span>\u00a0Pelo\u00a0<\/b><\/span><\/span>princ\u00edpio da a\u00e7\u00e3o e rea\u00e7\u00e3o<\/b><\/span><\/span><\/span><\/span><\/p>\n

o\u00a0<\/b><\/span><\/span>apoio B reagir\u00e1 sobre o bloco A com uma\u00a0<\/b><\/span><\/span>for\u00e7a\u00a0<\/b><\/span><\/span>\u00a0para a esquerda.\u00a0<\/b><\/span><\/span><\/span><\/span><\/p>\n

Essas <\/b><\/span><\/span>duas for\u00e7as<\/b><\/span><\/span> (par a\u00e7\u00e3o e rea\u00e7\u00e3o) s\u00e3o denominadas <\/b><\/span><\/span>for\u00e7as de atrito <\/b><\/span><\/span> (mesma intensidade, mesma dire\u00e7\u00e3o, mas sentidos opostos).<\/b><\/span><\/span><\/span><\/span><\/p>\n

\u00a0<\/span><\/p>\n

<\/p>\n

\u00a0a esquerda<\/b><\/span><\/span><\/span>.<\/b><\/span><\/span><\/span><\/span><\/span><\/p>\n

<\/p>\n

A\u00a0<\/b><\/span><\/span>for\u00e7a normal <\/b><\/span><\/span> \u00a0<\/b><\/span><\/span>\u00e9 a<\/b><\/span><\/span>\u00a0<\/b><\/span><\/span>for\u00e7a trocada entre duas superf\u00edcies s\u00f3lidas que est\u00e3o em contato<\/b><\/span><\/span> <\/b>comprimindo-se<\/b><\/span><\/span>\u00a0<\/b><\/span><\/span>e que\u00a0<\/b><\/span><\/span>\u00e9 sempre perpendicular \u00e0 reta \u00e0 reta que tangencia as superf\u00edcies no ponto de contato.<\/b><\/span><\/span><\/span><\/span><\/p>\n

Obedecem ao\u00a0<\/b><\/span><\/span>princ\u00edpio da a\u00e7\u00e3o e rea\u00e7\u00e3o<\/b><\/span><\/span>\u00a0e n\u00e3o se anulam, pois s\u00e3o aplicadas em corpos diferentes.<\/b><\/span><\/span><\/span><\/span><\/p>\n

Exemplos<\/b><\/span><\/span><\/span><\/span><\/span><\/p>\n

<\/p>\n

<\/p>\n

\u00a0<\/span>A\u00a0<\/b><\/span><\/span><\/span>for\u00e7a de tra\u00e7\u00e3o ou tens\u00e3o<\/b><\/span><\/span><\/span>\u00a0\u00e9 uma\u00a0<\/b><\/span><\/span><\/span>for\u00e7a que \u00e9 transmitida sempre por\u00a0<\/b><\/span><\/span><\/span>fios, cordas ou cabos<\/b><\/span><\/span><\/span>\u00a0<\/b><\/span><\/span>ideais<\/b><\/span><\/span><\/span>\u00a0(inextens\u00edveis e de massas desprez\u00edveis) distendendo-os (tracionando-os, esticando-os).<\/b><\/span><\/span><\/span><\/span><\/span><\/p>\n

Exemplo<\/b><\/span><\/span><\/span><\/span><\/span><\/p>\n

<\/p>\n

Polias ou roldanas<\/b><\/span><\/span><\/span><\/span><\/p>\n

S\u00e3o\u00a0<\/b><\/span><\/span>dispositivos<\/b><\/span><\/span>\u00a0que tem por <\/b><\/span><\/span>fun\u00e7\u00e3o\u00a0mudar a dire\u00e7\u00e3o e o sentido da for\u00e7a\u00a0aplicada <\/b><\/span><\/span>atrav\u00e9s <\/b><\/span><\/span>de um fio, mas\u00a0mantendo sua intensidade.\u00a0<\/b><\/span><\/span><\/span><\/span><\/p>\n

Veja na <\/b><\/span><\/span>figura <\/b><\/span><\/span>que a\u00a0<\/b><\/span><\/span>for\u00e7a\u00a0aplicada pelo motor\u00a0<\/b><\/span><\/span>no fio\u00a0tem\u00a0<\/b><\/span><\/span>dire\u00e7\u00e3o horizontal e sentido para a direita\u00a0<\/b><\/span><\/span>e\u00a0no <\/b><\/span><\/span>bloco\u00a0tem\u00a0dire\u00e7\u00e3o vertical e\u00a0sentido para cima.<\/b><\/span><\/span><\/span><\/span><\/p>\n

<\/p>\n

Numa\u00a0<\/b><\/span><\/span>polia ideal <\/b><\/span><\/span>desprezam-se os atritos de modo que a <\/b><\/span><\/span>for\u00e7a no fio tenha sempre a mesma intensidade.<\/b><\/span><\/span><\/span><\/span><\/p>\n

Informa\u00e7\u00f5es \u00fateis <\/b><\/span><\/span><\/span>(Dicas de vestibulares)<\/b><\/span><\/span><\/span><\/span><\/span><\/p>\n

<\/p>\n

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

Formul\u00e1rio completo de F\u00edsica com informa\u00e7\u00f5es \u00fateis (dicas para vestibulares) Din\u00e2mica 4 Tipos de For\u00e7as apoio B tamb\u00e9m para a direita,\u00a0aplicando ao apoio uma for\u00e7a\u00a0.\u00a0Pelo\u00a0princ\u00edpio da a\u00e7\u00e3o e rea\u00e7\u00e3o o\u00a0apoio B reagir\u00e1 sobre o bloco A com uma\u00a0for\u00e7a\u00a0\u00a0para a esquerda.\u00a0 Essas duas for\u00e7as (par a\u00e7\u00e3o e rea\u00e7\u00e3o) s\u00e3o denominadas for\u00e7as de atrito (mesma intensidade, mesma dire\u00e7\u00e3o, mas sentidos opostos). \u00a0<\/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-3995","page","type-page","status-publish","hentry"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/3995","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=3995"}],"version-history":[{"count":1,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/3995\/revisions"}],"predecessor-version":[{"id":3996,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/3995\/revisions\/3996"}],"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=3995"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}