{"id":4017,"date":"2018-06-25T05:01:48","date_gmt":"2018-06-25T05:01:48","guid":{"rendered":"http:\/\/fisicaevestibular.com.br\/novo\/?page_id=4017"},"modified":"2024-08-22T12:50:13","modified_gmt":"2024-08-22T12:50:13","slug":"dinamica-15-trabalho-dos-diversos-tipos-de-forcas","status":"publish","type":"page","link":"https:\/\/fisicaevestibular.com.br\/novo\/formulario\/dinamica-15-trabalho-dos-diversos-tipos-de-forcas\/","title":{"rendered":"Din\u00e2mica 15 – Trabalho dos diversos tipos de for\u00e7as"},"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 15<\/b><\/span><\/span><\/span><\/p>\n

Trabalho dos diversos tipos de for\u00e7as<\/b><\/span><\/span><\/span><\/p>\n

Trabalho de uma for\u00e7a constante<\/b><\/span><\/span><\/span><\/p>\n

<\/p>\n

Informa\u00e7\u00f5es \u00fatei<\/span><\/span><\/span>s <\/span><\/span>(Dicas)<\/span><\/span><\/span><\/p>\n

<\/p>\n

O\u00a0<\/b><\/span><\/span><\/span>trabalho<\/b><\/span><\/span><\/span>\u00a0\u00e9 sempre de uma\u00a0<\/b><\/span><\/span><\/span>for\u00e7a aplicada\u00a0<\/b><\/span><\/span><\/span>num corpo por um\u00a0<\/b><\/span><\/span><\/span>agente externo que lhe fornece ou retira energia.<\/b><\/span><\/span><\/span><\/p>\n

<\/p>\n

Um joule (J)<\/b><\/span><\/span><\/span>\u00a0\u00e9 o\u00a0<\/b><\/span><\/span><\/span>trabalho realizado <\/b><\/span><\/span><\/span>(energia transferida)<\/b><\/span><\/span><\/span>\u00a0<\/b><\/span><\/span><\/span>quando uma\u00a0<\/b><\/span><\/span><\/span>for\u00e7a de 1N <\/b><\/span><\/span><\/span>age sobre um corpo\u00a0<\/b><\/span><\/span><\/span>deslocando-o de 1m,<\/b><\/span><\/span><\/span>\u00a0com a\u00a0<\/b><\/span><\/span><\/span>for\u00e7a tendo a mesma dire\u00e7\u00e3o e o mesmo sentido do deslocamento.<\/b><\/span><\/span><\/span><\/p>\n

<\/p>\n

Sendo as i<\/b><\/span><\/span><\/span>ntensidades\u00a0<\/b><\/span><\/span><\/span>de\u00a0<\/b><\/span><\/span><\/span>\u00a0e de\u00a0<\/b><\/span><\/span><\/span>\u00a0<\/b><\/span><\/span><\/span>n\u00fameros positivos<\/b><\/span><\/span><\/span>, a \u00fanica grandeza da express\u00e3o\u00a0<\/b><\/span><\/span><\/span>W = F.d.cos\u03b1<\/b><\/span><\/span><\/span>\u00a0que pode ter o\u00a0<\/b><\/span><\/span><\/span>sinal vari\u00e1vel \u00e9 o fator cos\u03b1\u00a0<\/b><\/span><\/span><\/span>(entre +1 e -1),variando\u00a0assim o\u00a0sinal do trabalho.<\/b><\/span><\/span><\/span><\/p>\n

Assim,\u00a0podemos <\/b><\/span><\/span><\/span>selecionar tr\u00eas casos:<\/b><\/span><\/span><\/span><\/p>\n

\u00a0<\/span>Trabalho motor ou ativo<\/b><\/span><\/span><\/span><\/p>\n

<\/p>\n

\u00a0<\/span>Trabalho resistente ou passivo<\/b><\/span><\/span><\/span><\/p>\n

<\/p>\n

\u00a0<\/span>Trabalho<\/b><\/span><\/span><\/span> <\/b>nulo<\/b><\/span><\/span><\/span><\/p>\n

<\/p>\n

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

<\/p>\n

<\/p>\n

O trabalho <\/b><\/span><\/span><\/span>ser\u00e1 nulo<\/b><\/span><\/span><\/span> quando:<\/b><\/span><\/span><\/span><\/p>\n

<\/p>\n

<\/p>\n

<\/p>\n

Trabalho da for\u00e7a de atrito:<\/b><\/span><\/span><\/span><\/p>\n

<\/p>\n

Trabalho de uma for\u00e7a vari\u00e1vel<\/b><\/span><\/span><\/span><\/p>\n

<\/p>\n

Trabalho da For\u00e7a Peso<\/b><\/span><\/span><\/span><\/p>\n

<\/p>\n

Informa\u00e7\u00f5es \u00fatei<\/span><\/span><\/span>s <\/span><\/span>(Dicas)<\/span><\/span><\/span><\/p>\n

<\/p>\n

O\u00a0<\/b><\/span><\/span><\/span>trabalho da for\u00e7a peso<\/b><\/span><\/span><\/span>\u00a0\u00e9\u00a0<\/b><\/span><\/span><\/span>positivo <\/b><\/span><\/span><\/span>na<\/b><\/span><\/span><\/span> descida<\/b><\/span><\/span><\/span>,<\/b><\/span><\/span><\/span>\u00a0<\/b><\/span><\/span><\/span>negativo na subida\u00a0<\/b><\/span><\/span><\/span>e<\/b><\/span><\/span><\/span>\u00a0nulo num deslocamento horizontal.<\/b><\/span><\/span><\/span><\/p>\n

<\/p>\n

O <\/b><\/span><\/span><\/span>trabalho<\/b><\/span><\/span><\/span>\u00a0realizado\u00a0<\/b><\/span><\/span><\/span>pela <\/b><\/span><\/span><\/span>for\u00e7a peso n\u00e3o depende da trajet\u00f3ria percorrida <\/b><\/span><\/span><\/span>pelo ponto material.<\/b><\/span><\/span><\/span><\/p>\n

<\/p>\n

<\/p>\n

<\/p>\n

Trabalho da for\u00e7a el\u00e1stica<\/b><\/span><\/span><\/span><\/p>\n

<\/p>\n

Informa\u00e7\u00f5es \u00fatei<\/span><\/span><\/span>s <\/span><\/span>(Dicas)<\/span><\/span><\/span><\/p>\n

<\/p>\n

<\/p>\n

<\/p>\n

O\u00a0<\/b><\/span><\/span><\/span>trabalho da for\u00e7a el\u00e1stica<\/b><\/span><\/span><\/span> ser\u00e1 <\/b><\/span><\/span><\/span>resistente <\/b><\/span><\/span><\/span>(negativo)<\/b><\/span><\/span><\/span>\u00a0se a\u00a0<\/b><\/span><\/span><\/span>deforma\u00e7\u00e3o X for for\u00e7ada<\/b><\/span><\/span><\/span>,<\/b><\/span><\/span><\/span> ou seja, uma for\u00e7a\u00a0<\/b><\/span><\/span><\/span>externa estar\u00e1 alongando (esticando) ou comprimindo a mola<\/b><\/span><\/span><\/span>\u00a0e, nesse caso, o\u00a0<\/b><\/span><\/span><\/span>trabalho da<\/b><\/span><\/span><\/span>\u00a0<\/b><\/span><\/span><\/span>for\u00e7a externa<\/b><\/span><\/span><\/span>\u00a0<\/b><\/span><\/span><\/span>ter\u00e1 em cada ponto a\u00a0<\/b><\/span><\/span><\/span>mesma intensidade<\/b><\/span><\/span><\/span>\u00a0<\/b><\/span><\/span><\/span>(m\u00f3dulo)\u00a0<\/b><\/span><\/span><\/span>que o <\/b><\/span><\/span><\/span>trabalho da for\u00e7a el\u00e1stica,<\/b><\/span><\/span><\/span>\u00a0mas\u00a0 que\u00a0<\/b><\/span><\/span><\/span>ser\u00e1 positivo.<\/b><\/span><\/span><\/span><\/p>\n

O<\/b><\/span><\/span><\/span>\u00a0<\/b><\/span><\/span><\/span>trabalho da for\u00e7a el\u00e1stica ser\u00e1 motor<\/b><\/span><\/span><\/span> (positivo),<\/b><\/span><\/span><\/span>\u00a0se\u00a0<\/b><\/span><\/span><\/span>n\u00e3o existir for\u00e7a externa<\/b><\/span><\/span><\/span>,<\/b><\/span><\/span><\/span> com a\u00a0<\/b><\/span><\/span><\/span>mola <\/b><\/span><\/span><\/span>tendendo naturalmente<\/b><\/span><\/span><\/span> \u00e0 <\/b><\/span><\/span><\/span>voltar \u00e0 posi\u00e7\u00e3o inicial<\/b><\/span><\/span><\/span> (de equil\u00edbrio).<\/b><\/span><\/span><\/span><\/p>\n

<\/p>\n

O\u00a0<\/b><\/span><\/span><\/span>trabalho da for\u00e7a el\u00e1stica<\/b><\/span><\/span><\/span>,<\/b><\/span><\/span><\/span> assim com o <\/b><\/span><\/span><\/span>trabalho da for\u00e7a peso<\/b><\/span><\/span><\/span>\u00a0<\/b><\/span><\/span><\/span>independe da trajet\u00f3ria<\/b><\/span><\/span><\/span> <\/b>e, por isso a\u00a0<\/b><\/span><\/span><\/span>for\u00e7a peso e for\u00e7a el\u00e1stica<\/b><\/span><\/span><\/span>\u00a0<\/b><\/span><\/span><\/span>s\u00e3o\u00a0<\/b><\/span><\/span><\/span>chamadas de <\/b><\/span><\/span><\/span>for\u00e7as conservativas.<\/b><\/span><\/span><\/span><\/p>\n

Assim, em\u00a0<\/b><\/span><\/span><\/span>rela\u00e7\u00e3o \u00e0 posi\u00e7\u00e3o de equil\u00edbrio de uma mola<\/b><\/span><\/span><\/span>, o\u00a0<\/b><\/span><\/span><\/span>trabalho<\/b><\/span><\/span><\/span>\u00a0realizado para\u00a0<\/b><\/span><\/span><\/span>comprimi-la por uma dist\u00e2ncia X <\/b><\/span><\/span><\/span>\u00e9 igual<\/b><\/span><\/span><\/span> ao trabalho para distend\u00ea-la da mesma dist\u00e2ncia X.<\/b><\/span><\/span><\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

Formul\u00e1rio completo de F\u00edsica com informa\u00e7\u00f5es \u00fateis (dicas para vestibulares) Din\u00e2mica 15 Trabalho dos diversos tipos de for\u00e7as Trabalho de uma for\u00e7a constante Informa\u00e7\u00f5es \u00fateis (Dicas) O\u00a0trabalho\u00a0\u00e9 sempre de uma\u00a0for\u00e7a aplicada\u00a0num corpo por um\u00a0agente externo que lhe fornece ou retira energia. Um joule (J)\u00a0\u00e9 o\u00a0trabalho realizado (energia transferida)\u00a0quando uma\u00a0for\u00e7a de 1N age sobre um corpo\u00a0deslocando-o de 1m,\u00a0com a\u00a0for\u00e7a tendo a<\/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-4017","page","type-page","status-publish","hentry"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/4017","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=4017"}],"version-history":[{"count":1,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/4017\/revisions"}],"predecessor-version":[{"id":4018,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/4017\/revisions\/4018"}],"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=4017"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}