{"id":4005,"date":"2018-06-25T04:57:14","date_gmt":"2018-06-25T04:57:14","guid":{"rendered":"http:\/\/fisicaevestibular.com.br\/novo\/?page_id=4005"},"modified":"2024-08-22T13:04:16","modified_gmt":"2024-08-22T13:04:16","slug":"dinamica-9-forca-elastica","status":"publish","type":"page","link":"https:\/\/fisicaevestibular.com.br\/novo\/formulario\/dinamica-9-forca-elastica\/","title":{"rendered":"Din\u00e2mica 9 – For\u00e7a el\u00e1stica"},"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 9<\/b><\/span><\/span><\/span><\/p>\n

For\u00e7a el\u00e1stica <\/b><\/span><\/span><\/span>\u2013 Lei de Hooke \u2013 Associa\u00e7\u00e3o de molas<\/b><\/span><\/span><\/span><\/p>\n

<\/p>\n

Representa\u00e7\u00e3o gr\u00e1fica da<\/b><\/span><\/span> Lei de HOOKE<\/b><\/span><\/span>:<\/b><\/span><\/span><\/span><\/span><\/p>\n

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

<\/p>\n

Significado f\u00edsico de K<\/b><\/span><\/span><\/span>\u00a0<\/b><\/span><\/span><\/span>\u00a0<\/b><\/span><\/span><\/span>se <\/b><\/span><\/span><\/span>a\u00a0<\/b><\/span><\/span><\/span>constante el\u00e1stica<\/b><\/span><\/span><\/span>\u00a0de uma mola for, por exemplo,\u00a0<\/b><\/span><\/span><\/span>K = 20N\/cm,<\/b><\/span><\/span><\/span>\u00a0<\/b><\/span><\/span><\/span>isto significa\u00a0<\/b><\/span><\/span><\/span>que uma\u00a0<\/b><\/span><\/span><\/span>for\u00e7a de 20N<\/b><\/span><\/span><\/span>\u00a0provoca nessa mola uma <\/b><\/span><\/span><\/span>deforma\u00e7\u00e3o de 1<\/b><\/span><\/span><\/span> cm.<\/b><\/span><\/span><\/span><\/p>\n

<\/p>\n

Uma\u00a0<\/b><\/span><\/span><\/span>deforma\u00e7\u00e3o \u00e9 el\u00e1stica<\/b><\/span><\/span><\/span> quando ela obedece \u00e0 lei de Hooke<\/b><\/span><\/span><\/span>, ou seja,\u00a0<\/b><\/span><\/span><\/span>retorna \u00e0 posi\u00e7\u00e3o normal<\/b><\/span><\/span><\/span>\u00a0<\/b><\/span><\/span><\/span>(natural, relaxada)<\/b><\/span><\/span><\/span>\u00a0quando a\u00a0<\/b><\/span><\/span><\/span>for\u00e7a deformadora \u00e9 retirada<\/b><\/span><\/span><\/span>, <\/b><\/span><\/span><\/span>pois existe um <\/b><\/span><\/span><\/span>limite,\u00a0<\/b><\/span><\/span><\/span>acima do qual a mola\u00a0<\/b><\/span><\/span><\/span>\u00e9 deformada e n\u00e3o retorna mais \u00e0 posi\u00e7\u00e3o normal<\/b><\/span><\/span><\/span>\u00a0com a <\/b><\/span><\/span><\/span>deforma\u00e7\u00e3o ficando permanente.<\/b><\/span><\/span><\/span><\/p>\n

<\/p>\n

<\/p>\n

<\/p>\n

Associa\u00e7\u00e3o de molas<\/b><\/span><\/span><\/span><\/span><\/span><\/p>\n

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

Associa\u00e7\u00e3o em paralelo<\/b><\/span><\/span><\/span><\/span><\/span><\/p>\n

Nesse caso a\u00a0<\/b><\/span><\/span>deforma\u00e7\u00e3o\u00a0x<\/b><\/span><\/span>\u00a0sofrida por\u00a0<\/b><\/span><\/span>cada uma das molas \u00e9 <\/b><\/span><\/span>a mesma.<\/b><\/span><\/span><\/span><\/span><\/p>\n

<\/p>\n

Se voc\u00ea tiver\u00a0<\/b><\/span><\/span>n\u00a0<\/b><\/span><\/span>molas<\/b><\/span><\/span>\u00a0\u00a0<\/b><\/span><\/span>\u00a0 <\/b><\/span><\/span>K<\/b><\/span><\/span>e<\/b><\/span><\/sub><\/span>\u00a0= K<\/b><\/span><\/span>1<\/b><\/span><\/sub><\/span>\u00a0+ K<\/b><\/span><\/span>2<\/b><\/span><\/sub><\/span>\u00a0+ K<\/b><\/span><\/span>3<\/b><\/span><\/sub><\/span>\u00a0+ \u2026. K<\/b><\/span><\/span>n<\/b><\/span><\/sub><\/span>.<\/b><\/span><\/span><\/span><\/span><\/p>\n

Associa\u00e7\u00e3o em s\u00e9rie<\/b><\/span><\/span><\/span>\u00a0<\/b><\/span><\/span><\/span><\/span><\/p>\n

Nesse caso <\/b><\/span><\/span>as\u00a0<\/b><\/span><\/span>molas 1 e 2 est\u00e3o sujeitas \u00e0 mesma for\u00e7a F<\/b><\/span><\/span>\u00a0e\u00a0<\/b><\/span><\/span>sofrem deforma\u00e7\u00f5es diferentes<\/b><\/span><\/span>\u00a0<\/b><\/span><\/span>x<\/b><\/span><\/span>1<\/b><\/span><\/sub><\/span>\u00a0e x<\/b><\/span><\/span>2<\/b><\/span><\/sub><\/span>.<\/b><\/span><\/span><\/span><\/span><\/p>\n

<\/p>\n

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

<\/p>\n

A\u00a0<\/b><\/span><\/span>constante el\u00e1stica<\/b><\/span><\/span>\u00a0<\/b><\/span><\/span>k<\/b><\/span><\/span> \u00e9 algo que\u00a0<\/b><\/span><\/span>define a mola<\/b><\/span><\/span>,<\/b><\/span><\/span>\u00a0<\/b><\/span><\/span>isto \u00e9, suas\u00a0<\/b><\/span><\/span>caracter\u00edsticas f\u00edsicas <\/b><\/span><\/span>(maleabilidade,\u00a0maciez),<\/b><\/span><\/span>\u00a0<\/b><\/span><\/span>constantes el\u00e1sticas maiores tendem a ter uma rigidez maior.<\/b><\/span><\/span><\/span><\/span><\/p>\n

\u00a0<\/span>Na associa\u00e7\u00e3o\u00a0<\/b><\/span><\/span>de molas em s\u00e9rie onde 1\/k<\/b><\/span><\/span>e<\/b><\/span><\/sub><\/span>\u00a0= 1\/k<\/b><\/span><\/span>1<\/b><\/span><\/sub><\/span>\u00a0+ 1\/k<\/b><\/span><\/span>2<\/b><\/span><\/sub><\/span>, <\/b><\/span><\/span>o valor de\u00a0<\/b><\/span><\/span>k<\/b><\/span><\/span>e<\/b><\/span><\/sub><\/span>\u00a0fica bastante reduzido,<\/b><\/span><\/span>\u00a0<\/b><\/span><\/span>sendo que a\u00a0<\/b><\/span><\/span>mola equivalente \u00e9 menos r\u00edgida,\u00a0mais deform\u00e1vel.<\/b><\/span><\/span><\/span><\/span><\/p>\n

<\/p>\n

Se\u00a0quisermos <\/b><\/span><\/span>aumentar a rigidez da mola equivalente,\u00a0torna-la menos deform\u00e1vel,<\/b><\/span><\/span> devemos\u00a0<\/b><\/span><\/span>associar<\/b><\/span><\/span> as <\/b><\/span><\/span>molas em paralelo, <\/b><\/span><\/span>onde <\/b><\/span><\/span>k<\/b><\/span><\/span>e\u00a0<\/b><\/span><\/sub><\/span>= k<\/b><\/span><\/span>1<\/b><\/span><\/sub><\/span>\u00a0\u00a0+ k<\/b><\/span><\/span>2<\/b><\/span><\/sub><\/span>.\u00a0<\/b><\/span><\/span>\u00c9 <\/b><\/span><\/span>mais eficaz <\/b><\/span><\/span>e ocupa <\/b><\/span><\/span>menos espa\u00e7o.<\/b><\/span><\/span><\/span><\/span><\/p>\n

<\/p>\n

Voc\u00ea\u00a0<\/b><\/span><\/span>parte<\/b><\/span><\/span> uma mola de\u00a0<\/b><\/span><\/span>constante el\u00e1stica\u00a0K<\/b><\/span><\/span>\u00a0<\/b><\/span><\/span>em<\/b><\/span><\/span>\u00a0<\/b><\/span><\/span>duas partes iguais, <\/b><\/span><\/span>de modo a obter <\/b><\/span><\/span>duas molas id\u00eanticas.<\/b><\/span><\/span><\/span><\/span><\/p>\n

\u00a0<\/span>C\u00e1lculo da\u00a0<\/b><\/span><\/span>constante el\u00e1stica K\u2019 de cada peda\u00e7o<\/b><\/span><\/span>\u00a0que \u00e9\u00a0<\/b><\/span><\/span>diferente de K,<\/b><\/span><\/span>\u00a0pois apesar do material ser o mesmo, o\u00a0<\/b><\/span><\/span>n\u00famero de espiras diminui:<\/b><\/span><\/span><\/span><\/span><\/p>\n

<\/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 9 For\u00e7a el\u00e1stica \u2013 Lei de Hooke \u2013 Associa\u00e7\u00e3o de molas Representa\u00e7\u00e3o gr\u00e1fica da Lei de HOOKE: Informa\u00e7\u00f5es \u00fateis (Dicas) Significado f\u00edsico de K\u00a0\u00a0se a\u00a0constante el\u00e1stica\u00a0de uma mola for, por exemplo,\u00a0K = 20N\/cm,\u00a0isto significa\u00a0que uma\u00a0for\u00e7a de 20N\u00a0provoca nessa mola uma deforma\u00e7\u00e3o de 1 cm. Uma\u00a0deforma\u00e7\u00e3o \u00e9 el\u00e1stica quando ela<\/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-4005","page","type-page","status-publish","hentry"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/4005","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=4005"}],"version-history":[{"count":1,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/4005\/revisions"}],"predecessor-version":[{"id":4006,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/4005\/revisions\/4006"}],"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=4005"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}