Ch\u01b0\u01a1ng 1 - B\u00e0i 4: Dao \u0111\u1ed9ng t\u1eaft d\u1ea7n. Dao \u0111\u1ed9ng c\u01b0\u1ee1ng b\u1ee9c<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/lop12.edu.vn\/chuong-1-bai-4-dao-dong-tat-dan-dao-dong-cuong-buc\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Ch\u01b0\u01a1ng 1 - B\u00e0i 4: Dao \u0111\u1ed9ng t\u1eaft d\u1ea7n. Dao \u0111\u1ed9ng c\u01b0\u1ee1ng b\u1ee9c\" \/>\n<meta property=\"og:description\" content=\"B\u00e0i 1 (trang 21 SGK V\u1eadt L\u00fd 12):\u00a0N\u00eau \u0111\u1eb7c \u0111i\u1ec3m c\u1ee7a dao \u0111\u1ed9ng t\u1eaft d\u1ea7n. Nguy\u00ean nh\u00e2n c\u1ee7a n\u00f3 l\u00e0 g\u00ec? L\u1eddi gi\u1ea3i: Dao \u0111\u1ed9ng t\u1eaft d\u1ea7n l\u00e0 dao \u0111\u1ed9ng c\u00f3 bi\u00ean \u0111\u1ed9 gi\u1ea3m d\u1ea7n theo th\u1eddi gian, dao \u0111\u1ed9ng t\u1eaft d\u1ea7n kh\u00f4ng c\u00f3 t\u00ednh \u0111i\u1ec1u h\u00f2a. Nguy\u00ean nh\u00e2n l\u00e0m t\u1eaft d\u1ea7n dao \u0111\u1ed9ng l\u00e0 […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/lop12.edu.vn\/chuong-1-bai-4-dao-dong-tat-dan-dao-dong-cuong-buc\/\" \/>\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=\"2018-03-31T04:39:13+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/lop12.edu.vn\/wp-content\/uploads\/2018\/03\/1-633.png\" \/>\n\t<meta property=\"og:image:width\" content=\"124\" \/>\n\t<meta property=\"og:image:height\" content=\"52\" \/>\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=\"4 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-4-dao-dong-tat-dan-dao-dong-cuong-buc\/\",\"url\":\"https:\/\/lop12.edu.vn\/chuong-1-bai-4-dao-dong-tat-dan-dao-dong-cuong-buc\/\",\"name\":\"Ch\u01b0\u01a1ng 1 - B\u00e0i 4: Dao \u0111\u1ed9ng t\u1eaft d\u1ea7n. Dao \u0111\u1ed9ng c\u01b0\u1ee1ng b\u1ee9c\",\"isPartOf\":{\"@id\":\"https:\/\/lop12.edu.vn\/#website\"},\"datePublished\":\"2018-03-31T04:39:13+00:00\",\"dateModified\":\"2018-03-31T04:39:13+00:00\",\"author\":{\"@id\":\"https:\/\/lop12.edu.vn\/#\/schema\/person\/2da855e5d06b553ac0065157cc261a45\"},\"breadcrumb\":{\"@id\":\"https:\/\/lop12.edu.vn\/chuong-1-bai-4-dao-dong-tat-dan-dao-dong-cuong-buc\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/lop12.edu.vn\/chuong-1-bai-4-dao-dong-tat-dan-dao-dong-cuong-buc\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/lop12.edu.vn\/chuong-1-bai-4-dao-dong-tat-dan-dao-dong-cuong-buc\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/lop12.edu.vn\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Ch\u01b0\u01a1ng 1 – B\u00e0i 4: Dao \u0111\u1ed9ng t\u1eaft d\u1ea7n. Dao \u0111\u1ed9ng c\u01b0\u1ee1ng b\u1ee9c\"}]},{\"@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_head_json":{"title":"Ch\u01b0\u01a1ng 1 - B\u00e0i 4: Dao \u0111\u1ed9ng t\u1eaft d\u1ea7n. Dao \u0111\u1ed9ng c\u01b0\u1ee1ng b\u1ee9c","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-4-dao-dong-tat-dan-dao-dong-cuong-buc\/","og_locale":"en_US","og_type":"article","og_title":"Ch\u01b0\u01a1ng 1 - B\u00e0i 4: Dao \u0111\u1ed9ng t\u1eaft d\u1ea7n. Dao \u0111\u1ed9ng c\u01b0\u1ee1ng b\u1ee9c","og_description":"B\u00e0i 1 (trang 21 SGK V\u1eadt L\u00fd 12):\u00a0N\u00eau \u0111\u1eb7c \u0111i\u1ec3m c\u1ee7a dao \u0111\u1ed9ng t\u1eaft d\u1ea7n. Nguy\u00ean nh\u00e2n c\u1ee7a n\u00f3 l\u00e0 g\u00ec? L\u1eddi gi\u1ea3i: Dao \u0111\u1ed9ng t\u1eaft d\u1ea7n l\u00e0 dao \u0111\u1ed9ng c\u00f3 bi\u00ean \u0111\u1ed9 gi\u1ea3m d\u1ea7n theo th\u1eddi gian, dao \u0111\u1ed9ng t\u1eaft d\u1ea7n kh\u00f4ng c\u00f3 t\u00ednh \u0111i\u1ec1u h\u00f2a. Nguy\u00ean nh\u00e2n l\u00e0m t\u1eaft d\u1ea7n dao \u0111\u1ed9ng l\u00e0 […]","og_url":"https:\/\/lop12.edu.vn\/chuong-1-bai-4-dao-dong-tat-dan-dao-dong-cuong-buc\/","og_site_name":"Lop12.edu.vn - C\u1ed9ng \u0111\u1ed3ng h\u1ecdc sinh l\u1edbp 12 l\u1edbn nh\u1ea5t t\u1ea1i Vi\u1ec7t Nam","article_published_time":"2018-03-31T04:39:13+00:00","og_image":[{"width":124,"height":52,"url":"https:\/\/lop12.edu.vn\/wp-content\/uploads\/2018\/03\/1-633.png","type":"image\/png"}],"author":"H\u00e0 Trang","twitter_card":"summary_large_image","twitter_misc":{"Written by":"H\u00e0 Trang","Est. reading time":"4 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/lop12.edu.vn\/chuong-1-bai-4-dao-dong-tat-dan-dao-dong-cuong-buc\/","url":"https:\/\/lop12.edu.vn\/chuong-1-bai-4-dao-dong-tat-dan-dao-dong-cuong-buc\/","name":"Ch\u01b0\u01a1ng 1 - B\u00e0i 4: Dao \u0111\u1ed9ng t\u1eaft d\u1ea7n. Dao \u0111\u1ed9ng c\u01b0\u1ee1ng b\u1ee9c","isPartOf":{"@id":"https:\/\/lop12.edu.vn\/#website"},"datePublished":"2018-03-31T04:39:13+00:00","dateModified":"2018-03-31T04:39:13+00:00","author":{"@id":"https:\/\/lop12.edu.vn\/#\/schema\/person\/2da855e5d06b553ac0065157cc261a45"},"breadcrumb":{"@id":"https:\/\/lop12.edu.vn\/chuong-1-bai-4-dao-dong-tat-dan-dao-dong-cuong-buc\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/lop12.edu.vn\/chuong-1-bai-4-dao-dong-tat-dan-dao-dong-cuong-buc\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/lop12.edu.vn\/chuong-1-bai-4-dao-dong-tat-dan-dao-dong-cuong-buc\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/lop12.edu.vn\/"},{"@type":"ListItem","position":2,"name":"Ch\u01b0\u01a1ng 1 – B\u00e0i 4: Dao \u0111\u1ed9ng t\u1eaft d\u1ea7n. Dao \u0111\u1ed9ng c\u01b0\u1ee1ng b\u1ee9c"}]},{"@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\/"}]}},"_links":{"self":[{"href":"https:\/\/lop12.edu.vn\/wp-json\/wp\/v2\/posts\/24875"}],"collection":[{"href":"https:\/\/lop12.edu.vn\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lop12.edu.vn\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lop12.edu.vn\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/lop12.edu.vn\/wp-json\/wp\/v2\/comments?post=24875"}],"version-history":[{"count":1,"href":"https:\/\/lop12.edu.vn\/wp-json\/wp\/v2\/posts\/24875\/revisions"}],"predecessor-version":[{"id":24881,"href":"https:\/\/lop12.edu.vn\/wp-json\/wp\/v2\/posts\/24875\/revisions\/24881"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/lop12.edu.vn\/wp-json\/wp\/v2\/media\/24876"}],"wp:attachment":[{"href":"https:\/\/lop12.edu.vn\/wp-json\/wp\/v2\/media?parent=24875"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lop12.edu.vn\/wp-json\/wp\/v2\/categories?post=24875"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lop12.edu.vn\/wp-json\/wp\/v2\/tags?post=24875"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}

{"id":24875,"date":"2018-03-31T11:39:13","date_gmt":"2018-03-31T04:39:13","guid":{"rendered":"https:\/\/lop12.edu.vn\/?p=24875"},"modified":"2018-03-31T11:39:13","modified_gmt":"2018-03-31T04:39:13","slug":"chuong-1-bai-4-dao-dong-tat-dan-dao-dong-cuong-buc","status":"publish","type":"post","link":"https:\/\/lop12.edu.vn\/chuong-1-bai-4-dao-dong-tat-dan-dao-dong-cuong-buc\/","title":{"rendered":"Ch\u01b0\u01a1ng 1 – B\u00e0i 4: Dao \u0111\u1ed9ng t\u1eaft d\u1ea7n. Dao \u0111\u1ed9ng c\u01b0\u1ee1ng b\u1ee9c"},"content":{"rendered":"

B\u00e0i 1 (trang 21 SGK V\u1eadt L\u00fd 12):<\/b>\u00a0N\u00eau \u0111\u1eb7c \u0111i\u1ec3m c\u1ee7a dao \u0111\u1ed9ng t\u1eaft d\u1ea7n. Nguy\u00ean nh\u00e2n c\u1ee7a n\u00f3 l\u00e0 g\u00ec?<\/span><\/p>\n

L\u1eddi gi\u1ea3i:<\/b><\/p>\n

Dao \u0111\u1ed9ng t\u1eaft d\u1ea7n l\u00e0 dao \u0111\u1ed9ng c\u00f3 bi\u00ean \u0111\u1ed9 gi\u1ea3m d\u1ea7n theo th\u1eddi gian, dao \u0111\u1ed9ng t\u1eaft d\u1ea7n kh\u00f4ng c\u00f3 t\u00ednh \u0111i\u1ec1u h\u00f2a. Nguy\u00ean nh\u00e2n l\u00e0m t\u1eaft d\u1ea7n dao \u0111\u1ed9ng l\u00e0 do l\u1ef1c c\u1ea3n c\u1ee7a m\u00f4i tr\u01b0\u1eddng. L\u1ef1c c\u1ea3n m\u00f4i tr\u01b0\u1eddng c\u00e0ng l\u1edbn th\u00ec s\u1ef1 t\u1eaft d\u1ea7n c\u00e0ng nhanh.<\/p>\n

B\u00e0i 2 (trang 21 SGK V\u1eadt L\u00fd 12):<\/b>\u00a0N\u00eau \u0111\u1eb7c \u0111i\u1ec3m c\u1ee7a dao \u0111\u1ed9ng duy tr\u00ec?<\/span><\/p>\n

L\u1eddi gi\u1ea3i:<\/b><\/p>\n

\u0110\u1eb7c \u0111i\u1ec3m c\u1ee7a dao \u0111\u1ed9ng duy tr\u00ec l\u00e0 cung c\u1ea5p ph\u1ea7n n\u0103ng l\u01b0\u1ee3ng \u0111\u00fang b\u1eb1ng ph\u1ea7n n\u0103ng l\u01b0\u1ee3ng ti\u00eau hao do ma s\u00e1t sau m\u1ed7i chu k\u00ec.<\/p>\n

B\u00e0i 3 (trang 21 SGK V\u1eadt L\u00fd 12):<\/b>\u00a0N\u00eau \u0111\u1eb7c \u0111i\u1ec3m c\u1ee7a dao \u0111\u1ed9ng c\u01b0\u1ee1ng b\u1ee9c.<\/span><\/p>\n

L\u1eddi gi\u1ea3i:<\/b><\/p>\n

\u0110\u1eb7c \u0111i\u1ec3m c\u1ee7a dao \u0111\u1ed9ng c\u01b0\u1ee1ng b\u1ee9c ph\u1ee5 thu\u1ed9c v\u00e0o s\u1ef1 ch\u00eanh l\u1ec7ch gi\u1eefa t\u1ea7n s\u1ed1 c\u1ee7a l\u1ef1c c\u01b0\u1ee1ng b\u1ee9c v\u00e0 t\u1ea7n s\u1ed1 ri\u00eang c\u1ee7a h\u1ec7 dao \u0111\u1ed9ng.<\/p>\n

B\u00e0i 4 (trang 21 SGK V\u1eadt L\u00fd 12):<\/b>\u00a0Hi\u1ec7n t\u01b0\u1ee3ng c\u1ed9ng h\u01b0\u1edfng l\u00e0 g\u00ec? N\u00eau \u0111i\u1ec1u ki\u1ec7n \u0111\u1ec3 c\u00f3 c\u1ed9ng h\u01b0\u1edfng. Cho m\u1ed9t v\u00ed d\u1ee5.<\/span><\/p>\n

L\u1eddi gi\u1ea3i:<\/b><\/p>\n

C\u1ed9ng h\u01b0\u1edfng l\u00e0 hi\u1ec7n t\u01b0\u1ee3ng bi\u00ean \u0111\u1ed9 dao \u0111\u1ed9ng c\u01b0\u1ee1ng b\u1ee9c t\u0103ng nhanh \u0111\u1ebfn m\u1ed9t gi\u00e1 tr\u1ecb c\u1ef1c \u0111\u1ea1i khi t\u1ea7n s\u1ed1 f c\u1ee7a l\u1ef1c c\u01b0\u1ee1ng b\u1ee9c b\u1eb1ng t\u1ea7n s\u1ed1 ri\u00eang c\u1ee7a h\u1ec7 f_{0<\/sub>. \u0110i\u1ec1u ki\u1ec7n \u0111\u1ec3 c\u00f3 c\u1ed9ng h\u01b0\u1edfng: f = f_{0<\/sub><\/p>\n}}

V\u00ed d\u1ee5: Chi\u1ebfc c\u1ea7u c\u00f3 th\u1ec3 g\u00e3y, n\u1ebfu \u0111o\u00e0n ng\u01b0\u1eddi \u0111i \u0111\u1ec1u b\u01b0\u1edbc qua chi\u1ebfc c\u1ea7u c\u00f3 t\u1ea7n s\u1ed1 c\u01b0\u1ee1ng b\u1ee9c f b\u1eb1ng v\u1edbi t\u1ea7n s\u1ed1 ri\u00eang c\u1ee7a chi\u1ebfc c\u1ea7u f_{0<\/sub>.<\/p>\n}

M\u1ed7i nh\u1ea1c c\u1ee5 \u0111\u1ec1u c\u00f3 h\u1ed9p c\u1ed9ng h\u01b0\u1edfng, \u0111\u1ec3 c\u00f3 th\u1ec3 dao \u0111\u1ed9ng c\u1ed9ng h\u01b0\u1edfng nhi\u1ec1u t\u1ea7n s\u1ed1 dao \u0111\u1ed9ng kh\u00e1c nhau.<\/p>\n

B\u00e0i 5 (trang 21 SGK V\u1eadt L\u00fd 12):<\/b>\u00a0M\u1ed9t con l\u1eafc dao \u0111\u1ed9ng t\u1eaft d\u1ea7n. C\u1ee9 sau m\u1ed7i chu k\u00ec, bi\u00ean \u0111\u1ed9 gi\u1ea3m 3%. Ph\u1ea7n n\u0103ng l\u01b0\u1ee3ng c\u1ee7a con l\u1eafc b\u1ecb m\u1ea5t \u0111i trong m\u1ed9t dao \u0111\u1ed9ng to\u00e0n ph\u1ea7n l\u00e0 bao nhi\u00eau?<\/span><\/p>\n

A. 3%<\/p>\n

B. 9%<\/p>\n

C. 4,5%<\/p>\n

D. 6%<\/p>\n

L\u1eddi gi\u1ea3i:<\/b><\/p>\n

Ch\u1ecdn \u0111\u00e1p \u00e1n D.<\/p>\n

N\u0103ng l\u01b0\u1ee3ng trong m\u1ed9t dao \u0111\u1ed9ng to\u00e0n ph\u1ea7n (m\u1ed9t chu k\u00ec):<\/p>\n

$\"\"$ <\/p>\n

Sau m\u1ed7i chu k\u00ec bi\u00ean \u0111\u1ed9 gi\u1ea3m 3%.<\/p>\n

N\u0103ng l\u01b0\u1ee3ng to\u00e0n ph\u1ea7n sau m\u1ed7i chu k\u00ec:<\/p>\n

$\"\"$ <\/p>\n

=> N\u0103ng l\u01b0\u1ee3ng b\u1ecb m\u1ea5t trong m\u1ed9t dao \u0111\u1ed9ng to\u00e0n ph\u1ea7n:<\/p>\n

$\"\"$ <\/p>\n

B\u00e0i 6 (trang 21 SGK V\u1eadt L\u00fd 12):<\/b>\u00a0M\u1ed9t con l\u1eafc d\u00e0i 44cm \u0111\u01b0\u1ee3c treo v\u00e0o tr\u1ea7n c\u1ee7a m\u1ed9t toa xe l\u1eeda. Con l\u1eafc b\u1ecb k\u00edch \u0111\u1ed9ng m\u1ed7i khi b\u00e1nh c\u1ee7a toa xe g\u1eb7p ch\u1ed7 n\u1ed1i nhau c\u1ee7a \u0111\u01b0\u1eddng ray. H\u1ecfi t\u00e0u ch\u1ea1y th\u1eb3ng \u0111\u1ec1u v\u1edbi t\u1ed1c \u0111\u1ed9 bao nhi\u00eau th\u00ec bi\u00ean \u0111\u1ed9 dao \u0111\u1ed9ng c\u1ee7a con l\u1eafc s\u1ebd l\u1edbn nh\u1ea5t? Cho bi\u1ebft chi\u1ec1u d\u00e0i c\u1ee7a m\u1ed7i \u0111\u01b0\u1eddng ray l\u00e0 12,5m. L\u1ea5y g = 9,8 m\/s^{2.<\/sup><\/span><\/p>\n}

A. 10,7 km\/h<\/p>\n

B. 40 km\/h<\/p>\n

C. 106 km\/h<\/p>\n

D. 45 km\/h<\/p>\n

L\u1eddi gi\u1ea3i:<\/b><\/p>\n

Ch\u1ecdn \u0111\u00e1p \u00e1n B.<\/p>\n

Con l\u1eafc dao \u0111\u1ed9ng c\u01b0\u1ee1ng b\u1ee9c m\u1ed7i khi toa xe \u0111i qua ch\u1ed7 n\u1ed1i hai thanh.<\/p>\n

$\"\"$ <\/p>\n

V\u1edbi v l\u00e0 v\u1eadn t\u1ed1c c\u1ee7a t\u00e0u, L l\u00e0 chi\u1ec1u d\u00e0i c\u1ee7a thanh<\/p>\n

Con l\u1eafc dao \u0111\u1ed9ng m\u1ea1nh nh\u1ea5t khi<\/p>\n

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

B\u00e0i 1 (trang 21 SGK V\u1eadt L\u00fd 12):\u00a0N\u00eau \u0111\u1eb7c \u0111i\u1ec3m c\u1ee7a dao \u0111\u1ed9ng t\u1eaft d\u1ea7n. Nguy\u00ean nh\u00e2n c\u1ee7a n\u00f3 l\u00e0 g\u00ec? L\u1eddi gi\u1ea3i: Dao \u0111\u1ed9ng t\u1eaft d\u1ea7n l\u00e0 dao \u0111\u1ed9ng c\u00f3 bi\u00ean \u0111\u1ed9 gi\u1ea3m d\u1ea7n theo th\u1eddi gian, dao \u0111\u1ed9ng t\u1eaft d\u1ea7n kh\u00f4ng c\u00f3 t\u00ednh \u0111i\u1ec1u h\u00f2a. Nguy\u00ean nh\u00e2n l\u00e0m t\u1eaft d\u1ea7n dao \u0111\u1ed9ng l\u00e0 […]<\/p>\n","protected":false},"author":3,"featured_media":24876,"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":"\nCh\u01b0\u01a1ng 1 - B\u00e0i 4: Dao \u0111\u1ed9ng t\u1eaft d\u1ea7n. Dao \u0111\u1ed9ng c\u01b0\u1ee1ng b\u1ee9c<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/lop12.edu.vn\/chuong-1-bai-4-dao-dong-tat-dan-dao-dong-cuong-buc\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Ch\u01b0\u01a1ng 1 - B\u00e0i 4: Dao \u0111\u1ed9ng t\u1eaft d\u1ea7n. Dao \u0111\u1ed9ng c\u01b0\u1ee1ng b\u1ee9c\" \/>\n<meta property=\"og:description\" content=\"B\u00e0i 1 (trang 21 SGK V\u1eadt L\u00fd 12):\u00a0N\u00eau \u0111\u1eb7c \u0111i\u1ec3m c\u1ee7a dao \u0111\u1ed9ng t\u1eaft d\u1ea7n. Nguy\u00ean nh\u00e2n c\u1ee7a n\u00f3 l\u00e0 g\u00ec? L\u1eddi gi\u1ea3i: Dao \u0111\u1ed9ng t\u1eaft d\u1ea7n l\u00e0 dao \u0111\u1ed9ng c\u00f3 bi\u00ean \u0111\u1ed9 gi\u1ea3m d\u1ea7n theo th\u1eddi gian, dao \u0111\u1ed9ng t\u1eaft d\u1ea7n kh\u00f4ng c\u00f3 t\u00ednh \u0111i\u1ec1u h\u00f2a. Nguy\u00ean nh\u00e2n l\u00e0m t\u1eaft d\u1ea7n dao \u0111\u1ed9ng l\u00e0 […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/lop12.edu.vn\/chuong-1-bai-4-dao-dong-tat-dan-dao-dong-cuong-buc\/\" \/>\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=\"2018-03-31T04:39:13+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/lop12.edu.vn\/wp-content\/uploads\/2018\/03\/1-633.png\" \/>\n\t<meta property=\"og:image:width\" content=\"124\" \/>\n\t<meta property=\"og:image:height\" content=\"52\" \/>\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=\"4 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-4-dao-dong-tat-dan-dao-dong-cuong-buc\/\",\"url\":\"https:\/\/lop12.edu.vn\/chuong-1-bai-4-dao-dong-tat-dan-dao-dong-cuong-buc\/\",\"name\":\"Ch\u01b0\u01a1ng 1 - B\u00e0i 4: Dao \u0111\u1ed9ng t\u1eaft d\u1ea7n. Dao \u0111\u1ed9ng c\u01b0\u1ee1ng b\u1ee9c\",\"isPartOf\":{\"@id\":\"https:\/\/lop12.edu.vn\/#website\"},\"datePublished\":\"2018-03-31T04:39:13+00:00\",\"dateModified\":\"2018-03-31T04:39:13+00:00\",\"author\":{\"@id\":\"https:\/\/lop12.edu.vn\/#\/schema\/person\/2da855e5d06b553ac0065157cc261a45\"},\"breadcrumb\":{\"@id\":\"https:\/\/lop12.edu.vn\/chuong-1-bai-4-dao-dong-tat-dan-dao-dong-cuong-buc\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/lop12.edu.vn\/chuong-1-bai-4-dao-dong-tat-dan-dao-dong-cuong-buc\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/lop12.edu.vn\/chuong-1-bai-4-dao-dong-tat-dan-dao-dong-cuong-buc\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/lop12.edu.vn\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Ch\u01b0\u01a1ng 1 – B\u00e0i 4: Dao \u0111\u1ed9ng t\u1eaft d\u1ea7n. Dao \u0111\u1ed9ng c\u01b0\u1ee1ng b\u1ee9c\"}]},{\"@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_head_json":{"title":"Ch\u01b0\u01a1ng 1 - B\u00e0i 4: Dao \u0111\u1ed9ng t\u1eaft d\u1ea7n. Dao \u0111\u1ed9ng c\u01b0\u1ee1ng b\u1ee9c","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-4-dao-dong-tat-dan-dao-dong-cuong-buc\/","og_locale":"en_US","og_type":"article","og_title":"Ch\u01b0\u01a1ng 1 - B\u00e0i 4: Dao \u0111\u1ed9ng t\u1eaft d\u1ea7n. Dao \u0111\u1ed9ng c\u01b0\u1ee1ng b\u1ee9c","og_description":"B\u00e0i 1 (trang 21 SGK V\u1eadt L\u00fd 12):\u00a0N\u00eau \u0111\u1eb7c \u0111i\u1ec3m c\u1ee7a dao \u0111\u1ed9ng t\u1eaft d\u1ea7n. Nguy\u00ean nh\u00e2n c\u1ee7a n\u00f3 l\u00e0 g\u00ec? L\u1eddi gi\u1ea3i: Dao \u0111\u1ed9ng t\u1eaft d\u1ea7n l\u00e0 dao \u0111\u1ed9ng c\u00f3 bi\u00ean \u0111\u1ed9 gi\u1ea3m d\u1ea7n theo th\u1eddi gian, dao \u0111\u1ed9ng t\u1eaft d\u1ea7n kh\u00f4ng c\u00f3 t\u00ednh \u0111i\u1ec1u h\u00f2a. Nguy\u00ean nh\u00e2n l\u00e0m t\u1eaft d\u1ea7n dao \u0111\u1ed9ng l\u00e0 […]","og_url":"https:\/\/lop12.edu.vn\/chuong-1-bai-4-dao-dong-tat-dan-dao-dong-cuong-buc\/","og_site_name":"Lop12.edu.vn - C\u1ed9ng \u0111\u1ed3ng h\u1ecdc sinh l\u1edbp 12 l\u1edbn nh\u1ea5t t\u1ea1i Vi\u1ec7t Nam","article_published_time":"2018-03-31T04:39:13+00:00","og_image":[{"width":124,"height":52,"url":"https:\/\/lop12.edu.vn\/wp-content\/uploads\/2018\/03\/1-633.png","type":"image\/png"}],"author":"H\u00e0 Trang","twitter_card":"summary_large_image","twitter_misc":{"Written by":"H\u00e0 Trang","Est. reading time":"4 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/lop12.edu.vn\/chuong-1-bai-4-dao-dong-tat-dan-dao-dong-cuong-buc\/","url":"https:\/\/lop12.edu.vn\/chuong-1-bai-4-dao-dong-tat-dan-dao-dong-cuong-buc\/","name":"Ch\u01b0\u01a1ng 1 - B\u00e0i 4: Dao \u0111\u1ed9ng t\u1eaft d\u1ea7n. Dao \u0111\u1ed9ng c\u01b0\u1ee1ng b\u1ee9c","isPartOf":{"@id":"https:\/\/lop12.edu.vn\/#website"},"datePublished":"2018-03-31T04:39:13+00:00","dateModified":"2018-03-31T04:39:13+00:00","author":{"@id":"https:\/\/lop12.edu.vn\/#\/schema\/person\/2da855e5d06b553ac0065157cc261a45"},"breadcrumb":{"@id":"https:\/\/lop12.edu.vn\/chuong-1-bai-4-dao-dong-tat-dan-dao-dong-cuong-buc\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/lop12.edu.vn\/chuong-1-bai-4-dao-dong-tat-dan-dao-dong-cuong-buc\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/lop12.edu.vn\/chuong-1-bai-4-dao-dong-tat-dan-dao-dong-cuong-buc\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/lop12.edu.vn\/"},{"@type":"ListItem","position":2,"name":"Ch\u01b0\u01a1ng 1 – B\u00e0i 4: Dao \u0111\u1ed9ng t\u1eaft d\u1ea7n. Dao \u0111\u1ed9ng c\u01b0\u1ee1ng b\u1ee9c"}]},{"@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\/"}]}},"_links":{"self":[{"href":"https:\/\/lop12.edu.vn\/wp-json\/wp\/v2\/posts\/24875"}],"collection":[{"href":"https:\/\/lop12.edu.vn\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lop12.edu.vn\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lop12.edu.vn\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/lop12.edu.vn\/wp-json\/wp\/v2\/comments?post=24875"}],"version-history":[{"count":1,"href":"https:\/\/lop12.edu.vn\/wp-json\/wp\/v2\/posts\/24875\/revisions"}],"predecessor-version":[{"id":24881,"href":"https:\/\/lop12.edu.vn\/wp-json\/wp\/v2\/posts\/24875\/revisions\/24881"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/lop12.edu.vn\/wp-json\/wp\/v2\/media\/24876"}],"wp:attachment":[{"href":"https:\/\/lop12.edu.vn\/wp-json\/wp\/v2\/media?parent=24875"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lop12.edu.vn\/wp-json\/wp\/v2\/categories?post=24875"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lop12.edu.vn\/wp-json\/wp\/v2\/tags?post=24875"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}