{"id":4009,"date":"2018-06-25T04:58:21","date_gmt":"2018-06-25T04:58:21","guid":{"rendered":"http:\/\/fisicaevestibular.com.br\/novo\/?page_id=4009"},"modified":"2024-08-22T12:44:09","modified_gmt":"2024-08-22T12:44:09","slug":"dinamica-11-forca-de-resistencia-do-ar","status":"publish","type":"page","link":"https:\/\/fisicaevestibular.com.br\/novo\/formulario\/dinamica-11-forca-de-resistencia-do-ar\/","title":{"rendered":"Din\u00e2mica 11 – For\u00e7a de resist\u00eancia do ar"},"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 11<\/b><\/span><\/span><\/span><\/p>\n

For\u00e7a de resist\u00eancia do ar<\/b><\/span><\/span><\/span><\/p>\n

<\/p>\n

Mas, quando os\u00a0<\/b><\/span><\/span>corpos se <\/b><\/span><\/span>movimentam num fluido (ar ou \u00e1gua),<\/b><\/span><\/span>\u00a0<\/b><\/span><\/span>al\u00e9m do <\/b><\/span><\/span>peso que \u00e9 constante<\/b><\/span><\/span>\u00a0<\/b><\/span><\/span>surge tamb\u00e9m uma\u00a0<\/b><\/span><\/span>for\u00e7a, <\/b><\/span><\/span>contr\u00e1ria ao movimento<\/b><\/span><\/span>, que chamamos de\u00a0<\/b><\/span><\/span>for\u00e7a de resist\u00eancia<\/b><\/span><\/span> <\/b>do ar ou da \u00e1gua.<\/b><\/span><\/span><\/span><\/span><\/p>\n

<\/p>\n

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

<\/p>\n

Nas<\/b><\/span><\/span><\/span>\u00a0<\/b><\/span><\/span><\/span>express\u00f5es\u00a0<\/b><\/span><\/span><\/span>F<\/b><\/span><\/span><\/span>r<\/b><\/span><\/span><\/sub><\/span>\u00a0= K.V<\/b><\/span><\/span><\/span>2<\/b><\/span><\/span><\/sup><\/span>\u00a0ou F<\/b><\/span><\/span><\/span>r<\/b><\/span><\/span><\/sub><\/span>\u00a0= K.V,<\/b><\/span><\/span><\/span>\u00a0<\/b><\/span><\/span><\/span>V\u00a0<\/b><\/span><\/span><\/span>\u00e9 a\u00a0<\/b><\/span><\/span><\/span>velocidade relativa<\/b><\/span><\/span><\/span>\u00a0entre o fluido e o corpo<\/b><\/span><\/span><\/span>.<\/b><\/span><\/span><\/span><\/p>\n

Assim, um carro a\u00a0<\/b><\/span><\/span><\/span>80 km\/h movendo-se num dia sem vento sofrer\u00e1<\/b><\/span><\/span><\/span>\u00a0a <\/b><\/span><\/span><\/span>mesma for\u00e7a contr\u00e1ria F<\/b><\/span><\/span><\/span>r<\/b><\/span><\/span><\/sub><\/span>, <\/b><\/span><\/span><\/span>que sofreria se\u00a0<\/b><\/span><\/span><\/span>estivesse a 50 km\/h movendo-se contra um vento a 30 km\/h.<\/b><\/span><\/span><\/span><\/p>\n

<\/p>\n

Quanto\u00a0<\/b><\/span><\/span>menor a \u00e1rea frontal em contato com o ar<\/b><\/span><\/span>,\u00a0menor ser\u00e1 <\/b><\/span><\/span>a pot\u00eancia <\/b><\/span><\/span>(esfor\u00e7o) <\/b><\/span><\/span>necess\u00e1ria para o\u00a0deslocamento de um carro nessa massa de ar.<\/b><\/span><\/span><\/span><\/span><\/p>\n

Influi <\/b><\/span><\/span>tamb\u00e9m um <\/b><\/span><\/span>formato aerodin\u00e2mico<\/b><\/span><\/span>\u00a0que faz com que a\u00a0<\/b><\/span><\/span>frente do carro corte o ar e fa\u00e7a-o escorregar de uma maneira mais eficiente, diminuindo sua resist\u00eancia.<\/b><\/span><\/span><\/span><\/span><\/p>\n

<\/p>\n

\u00a0<\/span>Esses <\/b><\/span><\/span>dois fatores juntos <\/b><\/span><\/span>melhoram <\/b><\/span><\/span>o desempenho do ve\u00edculo e provocam economia <\/b><\/span><\/span>de <\/b><\/span><\/span>combust\u00edvel, <\/b><\/span><\/span>fazendo com que <\/b><\/span><\/span>o <\/b><\/span><\/span>motor utilize menor pot\u00eancia (for\u00e7a) para manter a velocidade.<\/b><\/span><\/span><\/span><\/span><\/p>\n

<\/p>\n

As principais pe\u00e7as para\u00a0melhorar a aerodin\u00e2mica <\/b><\/span><\/span>de um carro de corrida s\u00e3o o\u00a0<\/b><\/span><\/span>aerof\u00f3lio que lhe<\/b><\/span><\/span>\u00a0<\/b><\/span><\/span>d\u00e1 uma melhor estabilidade vertical canalizando o<\/b><\/span><\/span> ar pelo cap\u00f4 com <\/b><\/span><\/span>mais perfei\u00e7\u00e3o e os dutos de<\/b><\/span><\/span><\/span><\/span><\/p>\n

<\/p>\n

condu\u00e7\u00e3o<\/b><\/span><\/span> que aliviam\u00a0<\/b><\/span><\/span>a resist\u00eancia do ar sobre o carro <\/b><\/span><\/span>e a usam para dar mais <\/b><\/span><\/span>estabilidade comprimindo-o mais contra o solo.<\/b><\/span><\/span><\/span><\/span><\/p>\n

O\u00a0<\/b><\/span><\/span>formato e curvas do cap\u00f4 do carro <\/b><\/span><\/span>tamb\u00e9m ajudam muito <\/b><\/span><\/span>na diminui\u00e7\u00e3o da resist\u00eancia do ar<\/b><\/span><\/span>, fazendo que o <\/b><\/span><\/span>carro \u201ccorte\u201d o vento <\/b><\/span><\/span>enquanto corre, <\/b><\/span><\/span>diminuindo muito seus efeitos contr\u00e1rios.<\/b><\/span><\/span><\/span><\/span><\/p>\n

<\/p>\n

A\u00a0<\/b><\/span><\/span>varia\u00e7\u00e3o da velocidade<\/b><\/span><\/span>\u00a0da queda de um corpo no ar<\/b><\/span><\/span> em\u00a0<\/b><\/span><\/span>fun\u00e7\u00e3o do tempo de, por exemplo, um paraquedista,<\/b><\/span><\/span>\u00a0est\u00e1 representada no gr\u00e1fico abaixo.<\/b><\/span><\/span><\/span><\/span><\/p>\n

Analise atentamente cada trecho.<\/b><\/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 11 For\u00e7a de resist\u00eancia do ar Mas, quando os\u00a0corpos se movimentam num fluido (ar ou \u00e1gua),\u00a0al\u00e9m do peso que \u00e9 constante\u00a0surge tamb\u00e9m uma\u00a0for\u00e7a, contr\u00e1ria ao movimento, que chamamos de\u00a0for\u00e7a de resist\u00eancia do ar ou da \u00e1gua. Informa\u00e7\u00f5es \u00fateis (dicas) Nas\u00a0express\u00f5es\u00a0Fr\u00a0= K.V2\u00a0ou Fr\u00a0= K.V,\u00a0V\u00a0\u00e9 a\u00a0velocidade relativa\u00a0entre o fluido e o<\/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-4009","page","type-page","status-publish","hentry"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/4009","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=4009"}],"version-history":[{"count":1,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/4009\/revisions"}],"predecessor-version":[{"id":4010,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/4009\/revisions\/4010"}],"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=4009"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}