B\u00e0i 1 (trang 13 SGK V\u1eadt L\u00fd 12):<\/b>\u00a0Kh\u1ea3o s\u00e1t dao \u0111\u1ed9ng c\u1ee7a con l\u1eafc l\u00f2 xo n\u1eb1m ngang. T\u00ecm c\u00f4ng th\u1ee9c c\u1ee7a l\u1ef1c k\u00e9o v\u1ec1.<\/span><\/p>\nL\u1eddi gi\u1ea3i:<\/b><\/p>\n
X\u00e9t con l\u1eafc l\u00f2 xo nh\u01b0 h\u00ecnh v\u1ebd:<\/p>\n
![\"\"](\"https:\/\/lop12.edu.vn\/wp-content\/uploads\/2018\/03\/1-641.png\")
<\/p>\n
Ch\u1ecdn h\u1ec7 tr\u1ee5c t\u1ecda \u0111\u1ed9 c\u00f3 Ox c\u00f3 g\u1ed1c t\u1ecda \u0111\u1ed9 O tr\u00f9ng v\u1edbi v\u1ecb tr\u00ed c\u00e2n b\u1eb1ng, chi\u1ec1u d\u01b0\u01a1ng l\u00e0 chi\u1ec1u quy \u01b0\u1edbc (nh\u01b0 h\u00ecnh v\u1ebd).<\/p>\n
T\u1eeb v\u1ecb tr\u00ed c\u00e2n b\u1eb1ng O k\u00e9o v\u1eadt m cho l\u00f2 xo d\u00e3n ra m\u1ed9t \u0111o\u1ea1n nh\u1ecf r\u1ed3i bu\u00f4ng tay, v\u1eadt s\u1ebd dao \u0111\u1ed9ng tr\u00ean m\u1ed9t \u0111\u01b0\u1eddng th\u1eb3ng quanh v\u1ecb tr\u00ed c\u00e2n b\u1eb1ng.<\/p>\n
![\"\"](\"https:\/\/lop12.edu.vn\/wp-content\/uploads\/2018\/03\/2-416.png\")
<\/p>\n
B\u00e0i 2 (trang 13 SGK V\u1eadt L\u00fd 12):<\/b>\u00a0N\u00eau c\u00f4ng th\u1ee9c t\u00ednh chu k\u00ec c\u1ee7a con l\u1eafc l\u00f2 xo.<\/span><\/p>\nL\u1eddi gi\u1ea3i:<\/b><\/p>\n
C\u00f4ng th\u1ee9c chu k\u00ec con l\u1eafc l\u00f2 xo<\/p>\n
![\"\"](\"https:\/\/lop12.edu.vn\/wp-content\/uploads\/2018\/03\/1-642.png\")
<\/p>\n
V\u1edbi : m : kh\u1ed1i l\u01b0\u1ee3ng qu\u1ea3 n\u1eb7ng (kg)<\/p>\n
k : l\u00e0 \u0111\u1ed9 c\u1ee9ng c\u1ee7a l\u00f2 xo, c\u00f3 \u0111\u01a1n v\u1ecb l\u00e0 Niuton tr\u00ean m\u00e9t (N\/m)<\/p>\n
T : l\u00e0 chu k\u00ec, c\u00f3 \u0111\u01a1n v\u1ecb l\u00e0 gi\u00e2y (s)<\/p>\n
B\u00e0i 3 (trang 13 SGK V\u1eadt L\u00fd 12):<\/b>\u00a0Vi\u1ebft c\u00f4ng th\u1ee9c c\u1ee7a \u0111\u1ed9ng n\u0103ng, th\u1ebf n\u0103ng v\u00e0 c\u01a1 n\u0103ng c\u1ee7a con l\u1eafc l\u00f2 xo.<\/span><\/p>\nKhi con l\u1eafc l\u00f2 xo dao \u0111\u1ed9ng \u0111i\u1ec1u h\u00f2a th\u00ec \u0111\u1ed9ng n\u0103ng v\u00e0 th\u1ebf n\u0103ng c\u1ee7a con l\u1eafc bi\u1ebfn \u0111\u1ed5i qua l\u1ea1i nh\u01b0 th\u1ebf n\u00e0o?<\/p>\n
L\u1eddi gi\u1ea3i:<\/b><\/p>\n
\u0110\u1ed9ng n\u0103ng :<\/p>\n
![\"\"](\"https:\/\/lop12.edu.vn\/wp-content\/uploads\/2018\/03\/1-643.png\")
<\/p>\n
W\u0111<\/sub>\u00a0: \u0110\u1ed9ng n\u0103ng c\u1ee7a con l\u1eafc l\u00f2 xo (J)<\/p>\nm: kh\u1ed1i l\u01b0\u1ee3ng c\u1ee7a v\u1eadt (kg)<\/p>\n
v: v\u1eadn t\u1ed1c c\u1ee7a v\u1eadt (m\/s)<\/p>\n
Th\u1ebf n\u0103ng (Ch\u1ecdn g\u1ed1c th\u1ebf n\u0103ng \u0111\u00e0n h\u1ed3i t\u1ea1i v\u1ecb tr\u00ed c\u00e2n b\u1eb1ng c\u1ee7a v\u1eadt)<\/p>\n
![\"\"](\"https:\/\/lop12.edu.vn\/wp-content\/uploads\/2018\/03\/2-417.png\")
<\/p>\n
Wt<\/sub>: th\u1ebf n\u0103ng \u0111\u00e0n h\u1ed3i (J)<\/p>\nk: \u0111\u1ed9 c\u1ee9ng l\u00f2 xo (N\/m)<\/p>\n
x: li \u0111\u1ed9 (m)<\/p>\n
C\u01a1 n\u0103ng: B\u1eb1ng t\u1ed5ng \u0111\u1ed9ng n\u0103ng v\u00e0 th\u1ebf n\u0103ng<\/p>\n
![\"\"](\"https:\/\/lop12.edu.vn\/wp-content\/uploads\/2018\/03\/3-214.png\")
<\/p>\n
Khi con l\u1eafc dao \u0111\u1ed9ng \u0111i\u1ec1u h\u00f2a, \u0111\u1ed9ng n\u0103ng t\u0103ng th\u00ec th\u1ebf n\u0103ng gi\u1ea3m v\u00e0 ng\u01b0\u1ee3c l\u1ea1i, \u0111\u1ed9ng n\u0103ng gi\u1ea3m th\u00ec th\u1ebf n\u0103ng t\u0103ng.<\/p>\n
B\u00e0i 4 (trang 13 SGK V\u1eadt L\u00fd 12):<\/b>\u00a0Ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang. C\u00f4ng th\u1ee9c t\u00ednh chu k\u00ec dao \u0111\u1ed9ng c\u1ee7a con l\u1eafc l\u00f2 xo l\u00e0:<\/span><\/p>\n![\"\"](\"https:\/\/lop12.edu.vn\/wp-content\/uploads\/2018\/03\/1-644.png\")
<\/p>\n
L\u1eddi gi\u1ea3i:<\/b><\/p>\n
Ch\u1ecdn \u0111\u00e1p \u00e1n D.<\/p>\n
B\u00e0i 5 (trang 13 SGK V\u1eadt L\u00fd 12):<\/b>\u00a0M\u1ed9t con l\u1eafc l\u00f2 xo dao \u0111\u1ed9ng \u0111i\u1ec1u h\u00f2a. L\u00f2 xo c\u00f3 \u0111\u1ed9 c\u1ee9ng k = 40 N\/m. Khi v\u1eadt m c\u1ee7a con l\u1eafc \u0111i qua v\u1ecb tr\u00ed c\u00f3 li \u0111\u1ed9 x = – 2cm th\u00ec th\u1ebf n\u0103ng c\u1ee7a con l\u1eafc l\u00e0 bao nhi\u00eau?<\/span><\/p>\nA. \u2013 0,016 J<\/p>\n
B. \u2013 0,008 J<\/p>\n
C. 0,016 J<\/p>\n
D. 0,008 J<\/p>\n
L\u1eddi gi\u1ea3i:<\/b><\/p>\n
Th\u1ebf n\u0103ng<\/p>\n
![\"\"](\"https:\/\/lop12.edu.vn\/wp-content\/uploads\/2018\/03\/1-645.png\")
<\/p>\n
Ch\u1ecdn \u0111\u00e1p \u00e1n D.<\/p>\n
\n
\n
B\u00e0i 6 (trang 13 SGK V\u1eadt L\u00fd 12):<\/b>\u00a0M\u1ed9t con l\u1eafc l\u00f2 xo g\u1ed3m m\u1ed9t kh\u1ed1i l\u01b0\u1ee3ng m = 0,4 kg v\u00e0 m\u1ed9t l\u00f2 xo c\u00f3 \u0111\u1ed9 c\u1ee9ng k = 80 N\/m. Con l\u1eafc dao \u0111\u1ed9ng \u0111i\u1ec1u h\u00f2a v\u1edbi bi\u00ean \u0111\u1ed9 b\u1eb1ng 0,1 m. H\u1ecfi t\u1ed1c \u0111\u1ed9 c\u1ee7a con l\u1eafc khi qua v\u1ecb tr\u00ed c\u00e2n b\u1eb1ng?<\/span><\/p>\nA. 0 m\/s<\/p>\n
B. 1,4 m\/s<\/p>\n
C. 2,0 m\/s<\/p>\n
D. 3,4 m\/s<\/p>\n
L\u1eddi gi\u1ea3i:<\/b><\/p>\n
T\u1ed1c \u0111\u1ed9 c\u1ee7a con l\u1eafc qua v\u1ecb tr\u00ed c\u00e2n b\u1eb1ng l\u00e0 c\u1ef1c \u0111\u1ea1i<\/p>\n
Ta c\u00f3 vmax<\/sub>\u00a0= \u03c9A v\u1edbi<\/p>\n![\"\"](\"https:\/\/lop12.edu.vn\/wp-content\/uploads\/2018\/03\/1-646.png\")
<\/p>\n
Ch\u1ecdn \u0111\u00e1p \u00e1n B.<\/p>\n
\n
<\/div>\n<\/div>\n<\/div>\n<\/div>\n
\n
<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"
B\u00e0i 1 (trang 13 SGK V\u1eadt L\u00fd 12):\u00a0Kh\u1ea3o s\u00e1t dao \u0111\u1ed9ng c\u1ee7a con l\u1eafc l\u00f2 xo n\u1eb1m ngang. T\u00ecm c\u00f4ng th\u1ee9c c\u1ee7a l\u1ef1c k\u00e9o v\u1ec1. L\u1eddi gi\u1ea3i: X\u00e9t con l\u1eafc l\u00f2 xo nh\u01b0 h\u00ecnh v\u1ebd: Ch\u1ecdn h\u1ec7 tr\u1ee5c t\u1ecda \u0111\u1ed9 c\u00f3 Ox c\u00f3 g\u1ed1c t\u1ecda \u0111\u1ed9 O tr\u00f9ng v\u1edbi v\u1ecb tr\u00ed c\u00e2n b\u1eb1ng, chi\u1ec1u d\u01b0\u01a1ng […]<\/p>\n","protected":false},"author":3,"featured_media":24896,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_mi_skip_tracking":false,"tdm_status":"","tdm_grid_status":""},"categories":[1303],"tags":[1428,1427],"yoast_head":"\n
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L\u1eddi gi\u1ea3i: X\u00e9t con l\u1eafc l\u00f2 xo nh\u01b0 h\u00ecnh v\u1ebd: Ch\u1ecdn h\u1ec7 tr\u1ee5c t\u1ecda \u0111\u1ed9 c\u00f3 Ox c\u00f3 g\u1ed1c t\u1ecda \u0111\u1ed9 O tr\u00f9ng v\u1edbi v\u1ecb tr\u00ed c\u00e2n b\u1eb1ng, chi\u1ec1u d\u01b0\u01a1ng […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/lop12.edu.vn\/chuong-1-bai-2-con-lac-lo-xo\/\" \/>\n<meta property=\"og:site_name\" content=\"Lop12.edu.vn - C\u1ed9ng \u0111\u1ed3ng h\u1ecdc sinh l\u1edbp 12 l\u1edbn nh\u1ea5t t\u1ea1i Vi\u1ec7t Nam\" \/>\n<meta property=\"article:published_time\" content=\"2018-03-31T05:01:31+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/lop12.edu.vn\/wp-content\/uploads\/2018\/03\/1-641.png\" \/>\n\t<meta property=\"og:image:width\" content=\"307\" \/>\n\t<meta property=\"og:image:height\" content=\"169\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"H\u00e0 Trang\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"H\u00e0 Trang\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/lop12.edu.vn\/chuong-1-bai-2-con-lac-lo-xo\/\",\"url\":\"https:\/\/lop12.edu.vn\/chuong-1-bai-2-con-lac-lo-xo\/\",\"name\":\"Ch\u01b0\u01a1ng 1- B\u00e0i 2: Con l\u1eafc l\u00f2 xo\",\"isPartOf\":{\"@id\":\"https:\/\/lop12.edu.vn\/#website\"},\"datePublished\":\"2018-03-31T05:01:31+00:00\",\"dateModified\":\"2018-03-31T05:01:31+00:00\",\"author\":{\"@id\":\"https:\/\/lop12.edu.vn\/#\/schema\/person\/2da855e5d06b553ac0065157cc261a45\"},\"breadcrumb\":{\"@id\":\"https:\/\/lop12.edu.vn\/chuong-1-bai-2-con-lac-lo-xo\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/lop12.edu.vn\/chuong-1-bai-2-con-lac-lo-xo\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/lop12.edu.vn\/chuong-1-bai-2-con-lac-lo-xo\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/lop12.edu.vn\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Ch\u01b0\u01a1ng 1- B\u00e0i 2: Con l\u1eafc l\u00f2 xo\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/lop12.edu.vn\/#website\",\"url\":\"https:\/\/lop12.edu.vn\/\",\"name\":\"Lop12.edu.vn - C\u1ed9ng \u0111\u1ed3ng h\u1ecdc sinh l\u1edbp 12\",\"description\":\"\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/lop12.edu.vn\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"en-US\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/lop12.edu.vn\/#\/schema\/person\/2da855e5d06b553ac0065157cc261a45\",\"name\":\"H\u00e0 Trang\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/lop12.edu.vn\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/secure.gravatar.com\/avatar\/545a8100db1147f314111301d261dc33?s=96&d=mm&r=g\",\"contentUrl\":\"https:\/\/secure.gravatar.com\/avatar\/545a8100db1147f314111301d261dc33?s=96&d=mm&r=g\",\"caption\":\"H\u00e0 Trang\"},\"url\":\"https:\/\/lop12.edu.vn\/author\/trangvth2\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Ch\u01b0\u01a1ng 1- B\u00e0i 2: Con l\u1eafc l\u00f2 xo","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/lop12.edu.vn\/chuong-1-bai-2-con-lac-lo-xo\/","og_locale":"en_US","og_type":"article","og_title":"Ch\u01b0\u01a1ng 1- B\u00e0i 2: Con l\u1eafc l\u00f2 xo","og_description":"B\u00e0i 1 (trang 13 SGK V\u1eadt L\u00fd 12):\u00a0Kh\u1ea3o s\u00e1t dao \u0111\u1ed9ng c\u1ee7a con l\u1eafc l\u00f2 xo n\u1eb1m ngang. 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