{"id":20602,"date":"2025-07-07T19:15:52","date_gmt":"2025-07-07T12:15:52","guid":{"rendered":"https:\/\/www.ckconitsha.com\/vn\/?p=20602"},"modified":"2025-07-07T19:15:52","modified_gmt":"2025-07-07T12:15:52","slug":"tong-hop-kien-thuc-ve-cong-co-hoc-bai-tap-thuc-hanh-vat-ly-8","status":"publish","type":"post","link":"https:\/\/www.ckconitsha.com\/vn\/tong-hop-kien-thuc-ve-cong-co-hoc-bai-tap-thuc-hanh-vat-ly-8\/","title":{"rendered":"T\u1ed5ng h\u1ee3p ki\u1ebfn th\u1ee9c v\u1ec1 c\u00f4ng c\u01a1 h\u1ecdc &amp; b\u00e0i t\u1eadp th\u1ef1c h\u00e0nh v\u1eadt l\u00fd 8"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_79_2 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.ckconitsha.com\/vn\/tong-hop-kien-thuc-ve-cong-co-hoc-bai-tap-thuc-hanh-vat-ly-8\/#Cong_viec_co_hoc_la_gi_Khi_nao_co_khi_hoat_dong\" >C\u00f4ng vi\u1ec7c c\u01a1 h\u1ecdc l\u00e0 g\u00ec? Khi n\u00e0o c\u01a1 kh\u00ed ho\u1ea1t \u0111\u1ed9ng?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.ckconitsha.com\/vn\/tong-hop-kien-thuc-ve-cong-co-hoc-bai-tap-thuc-hanh-vat-ly-8\/#Nhung_yeu_to_nao_phu_thuoc_vao_cong_viec_co_hoc\" >Nh\u1eefng y\u1ebfu t\u1ed1 n\u00e0o ph\u1ee5 thu\u1ed9c v\u00e0o c\u00f4ng vi\u1ec7c c\u01a1 h\u1ecdc<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.ckconitsha.com\/vn\/tong-hop-kien-thuc-ve-cong-co-hoc-bai-tap-thuc-hanh-vat-ly-8\/#Cong_thuc_tinh_toan_co_hoc\" >C\u00f4ng th\u1ee9c t\u00ednh to\u00e1n c\u01a1 h\u1ecdc<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.ckconitsha.com\/vn\/tong-hop-kien-thuc-ve-cong-co-hoc-bai-tap-thuc-hanh-vat-ly-8\/#Luu_y_khi_tinh_toan_co_hoc\" >L\u01b0u \u00fd khi t\u00ednh to\u00e1n c\u01a1 h\u1ecdc<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.ckconitsha.com\/vn\/tong-hop-kien-thuc-ve-cong-co-hoc-bai-tap-thuc-hanh-vat-ly-8\/#Giai_cac_bai_tap_co_hoc_vat_ly_8\" >Gi\u1ea3i c\u00e1c b\u00e0i t\u1eadp c\u01a1 h\u1ecdc v\u1eadt l\u00fd 8<\/a><\/li><\/ul><\/nav><\/div>\n<\/p>\n<p dir=\"ltr\">H\u00e3y t\u01b0\u1edfng t\u01b0\u1ee3ng tr\u01b0\u1eddng h\u1ee3p c\u1ee7a m\u1ed9t ng\u01b0\u1eddi d\u00f9ng c\u00f3 nhi\u1ec1u tr\u1ecdng l\u01b0\u1ee3ng n\u00e2ng tr\u1ecdng l\u01b0\u1ee3ng, anh ta \u0111ang \u1edf trong tr\u1ea1ng th\u00e1i c\u1ed1 \u0111\u1ecbnh, anh ta c\u00f3 l\u00e0m vi\u1ec7c kh\u00f4ng? V\u00e0 t\u1ea1i sao ch\u00fang ta c\u1ea7n nh\u1eadn ra b\u1ea5t k\u1ef3 tr\u01b0\u1eddng h\u1ee3p xu\u1ea5t hi\u1ec7n c\u01a1 h\u1ecdc, b\u1ea5t k\u1ef3 tr\u01b0\u1eddng h\u1ee3p n\u00e0o? \u0110\u1ec3 gi\u1ea3i th\u00edch c\u00f4ng vi\u1ec7c c\u01a1 h\u1ecdc l\u00e0 g\u00ec? V\u00e0 l\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 s\u1eed d\u1ee5ng c\u00e1c c\u00f4ng th\u1ee9c c\u01a1 h\u1ecdc \u0111\u1ec3 gi\u1ea3i quy\u1ebft c\u00e1c b\u00e0i t\u1eadp th\u1ec3 ch\u1ea5t m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3, vui l\u00f2ng t\u00ecm hi\u1ec3u b\u00e0i vi\u1ebft d\u01b0\u1edbi \u0111\u00e2y v\u1edbi kh\u1ec9. <\/p>\n<p>                                    <img decoding=\"async\" src=\"https:\/\/external-content.duckduckgo.com\/iu\/?u=https:\/\/vnmedia2.monkeyuni.net\/upload\/web\/image\/600x480.png\"><\/p>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Cong_viec_co_hoc_la_gi_Khi_nao_co_khi_hoat_dong\"><\/span>C\u00f4ng vi\u1ec7c c\u01a1 h\u1ecdc l\u00e0 g\u00ec? Khi n\u00e0o c\u01a1 kh\u00ed ho\u1ea1t \u0111\u1ed9ng? <span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><img decoding=\"async\" class=\"lazyload\" src=\"https:\/\/external-content.duckduckgo.com\/iu\/?u=https:\/\/vnmedia2.monkeyuni.net\/upload\/web\/img\/cong-co-hoc-2.jpg\" alt=\"N\u00f3 ho\u1ea1t \u0111\u1ed9ng tr\u01b0\u1eddng h\u1ee3p n\u00e0o? (\u1ea2nh: B\u1ed9 s\u01b0u t\u1eadp Internet)\" width=\"100%\"><\/p>\n<p dir=\"ltr\">\u0110\u1ec3 hi\u1ec3u c\u00f4ng vi\u1ec7c c\u01a1 h\u1ecdc n\u00e0o l\u00e0 \u0111\u1ea7u ti\u00ean, ch\u00fang t\u00f4i s\u1ebd ph\u00e2n bi\u1ec7t r\u00f5 r\u00e0ng hai tr\u01b0\u1eddng h\u1ee3p, trong tr\u01b0\u1eddng h\u1ee3p th\u1ef1c hi\u1ec7n c\u01a1 h\u1ecdc v\u00e0 tr\u01b0\u1eddng h\u1ee3p kh\u00f4ng th\u1ef1c hi\u1ec7n c\u01a1 h\u1ecdc. <\/p>\n<p dir=\"ltr\">V\u00ed d\u1ee5, b\u1ea1n \u0111\u1ea9y tay v\u00e0o t\u01b0\u1eddng m\u1eb7c d\u00f9 b\u1ea1n s\u1eed d\u1ee5ng m\u1ed9t l\u1ef1c kh\u1ed5ng l\u1ed3 \u0111\u1ec3 \u0111\u1ea9y nh\u01b0ng kh\u00f4ng \u0111\u01b0\u1ee3c coi l\u00e0 hi\u1ec7u su\u1ea5t c\u01a1 h\u1ecdc. Ho\u1eb7c m\u1ed9t v\u1eadn \u0111\u1ed9ng vi\u00ean c\u1eed t\u1ea1 n\u00e2ng t\u1ea1 \u1edf v\u1ecb tr\u00ed th\u1eb3ng \u0111\u1ee9ng c\u0169ng m\u1ea5t r\u1ea5t nhi\u1ec1u n\u1ed7 l\u1ef1c, nh\u01b0ng ch\u00fang t\u00f4i n\u00f3i r\u1eb1ng v\u1eadn \u0111\u1ed9ng vi\u00ean n\u00e0y kh\u00f4ng th\u1ef1c hi\u1ec7n c\u00f4ng vi\u1ec7c c\u01a1 h\u1ecdc. <\/p>\n<p dir=\"ltr\">V\u1eady khi n\u00e0o c\u00f4ng vi\u1ec7c c\u01a1 h\u1ecdc xu\u1ea5t hi\u1ec7n? Khi c\u00f9ng m\u1ed9t l\u1ef1c c\u00f3 t\u00e1c d\u1ee5ng c\u1ee7a m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng, y\u1ebfu t\u1ed1 x\u00e1c \u0111\u1ecbnh hi\u1ec7u su\u1ea5t c\u1ee7a c\u00f4ng \u0111\u1ee9c c\u01a1 h\u1ecdc l\u00e0 vi\u1ec7c di chuy\u1ec3n v\u1ecb tr\u00ed c\u1ee7a \u0111\u1ed1i t\u01b0\u1ee3ng. <\/p>\n<p dir=\"ltr\">Ch\u00fang t\u00f4i hi\u1ec3u c\u00f4ng vi\u1ec7c c\u01a1 h\u1ecdc nh\u01b0 sau:<\/p>\n<p dir=\"ltr\"><em>C\u00f4ng vi\u1ec7c c\u01a1 h\u1ecdc l\u00e0 h\u00e0nh \u0111\u1ed9ng th\u1ef1c hi\u1ec7n tr\u00ean m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng, sau \u0111\u00f3 khi\u1ebfn m\u1ed9t l\u1ef1c di chuy\u1ec3n \u0111\u1ed1i t\u01b0\u1ee3ng \u0111\u00f3. <\/em><\/p>\n<p dir=\"ltr\">N\u00f3i c\u00e1ch kh\u00e1c (theo s\u00e1ch gi\u00e1o khoa v\u1eadt l\u00fd 8 B\u00e0i 13): C\u00e1c thu\u1eadt ng\u1eef c\u00f4ng c\u1ed9ng c\u01a1 h\u1ecdc ch\u1ec9 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong tr\u01b0\u1eddng h\u1ee3p l\u1ef1c t\u00e1c d\u1ee5ng l\u00ean c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng nh\u01b0 c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng chuy\u1ec3n \u0111\u1ed9ng. <\/p>\n<p dir=\"ltr\">C\u01a1 kh\u00ed ph\u1ed5 bi\u1ebfn \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 c\u00f4ng ch\u00fang <\/p>\n<p dir=\"ltr\">V\u00ed d\u1ee5, trong m\u1ed9t s\u1ed1 tr\u01b0\u1eddng h\u1ee3p, s\u1ef1 xu\u1ea5t hi\u1ec7n c\u1ee7a c\u01a1 h\u1ecdc l\u00e0: <\/p>\n<ul>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">B\u1ea1n nh\u1ea5c m\u1ed9t c\u00e1i t\u00fai t\u1eeb m\u1eb7t \u0111\u1ea5t l\u00ean <\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">Con b\u00f2 \u0111ang k\u00e9o m\u1ed9t chi\u1ebfc xe di chuy\u1ec3n <\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">M\u1ed9t ng\u01b0\u1eddi \u0111i tr\u00ean d\u1ed1c <\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">C\u00e1c tr\u01b0\u1eddng h\u1ee3p l\u1ef1c t\u00e1c d\u1ee5ng l\u00ean c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng chuy\u1ec3n \u0111\u1ed9ng kh\u00e1c &#8230;<\/p>\n<\/li>\n<\/ul>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Nhung_yeu_to_nao_phu_thuoc_vao_cong_viec_co_hoc\"><\/span>Nh\u1eefng y\u1ebfu t\u1ed1 n\u00e0o ph\u1ee5 thu\u1ed9c v\u00e0o c\u00f4ng vi\u1ec7c c\u01a1 h\u1ecdc <span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><img decoding=\"async\" class=\"lazyload\" src=\"https:\/\/external-content.duckduckgo.com\/iu\/?u=https:\/\/vnmedia2.monkeyuni.net\/upload\/web\/img\/cong-co-hoc-3.jpg\" alt=\"C\u00e1c y\u1ebfu t\u1ed1 thay \u0111\u1ed5i c\u01a1 h\u1ecdc. (\u1ea2nh: B\u1ed9 s\u01b0u t\u1eadp Internet)\" width=\"100%\"><\/p>\n<p dir=\"ltr\">\u0110\u1ec3 c\u00f3 c\u00f4ng \u0111\u1ee9c, c\u1ea7n ph\u1ea3i c\u00f3 l\u1ef1c v\u00e0 l\u1ef1c khi\u1ebfn \u0111\u1ed1i t\u01b0\u1ee3ng chuy\u1ec3n \u0111\u1ed9ng \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 c\u01a1 h\u1ecdc. V\u00ec v\u1eady, c\u00f4ng vi\u1ec7c c\u01a1 h\u1ecdc ph\u1ee5 thu\u1ed9c v\u00e0o hai y\u1ebfu t\u1ed1:<\/p>\n<ul>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">L\u1ef1c t\u00e1c d\u1ee5ng l\u00ean \u0111\u1ed1i t\u01b0\u1ee3ng. \u0110\u1ed1i v\u1edbi m\u1ed7i tr\u01b0\u1eddng h\u1ee3p, c\u00f3 s\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa c\u00e1c l\u1ef1c l\u01b0\u1ee3ng. \u0110\u00f4i khi \u0111\u00f3 l\u00e0 m\u1ed9t l\u1ef1c k\u00e9o, khi l\u1ef1c \u0111\u00f3 l\u00e0 tr\u1ecdng l\u1ef1c (v\u00ed d\u1ee5, qu\u1ea3 t\u00e1o r\u01a1i xu\u1ed1ng t\u1eeb c\u00e2y tr\u1edf xu\u1ed1ng, l\u1ef1c th\u1ef1c hi\u1ec7n l\u1ef1c b\u00e2y gi\u1edd l\u00e0 tr\u1ecdng l\u1ef1c).<\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">Kho\u1ea3ng c\u00e1ch \u0111\u1ed1i t\u01b0\u1ee3ng di chuy\u1ec3n. <\/p>\n<\/li>\n<\/ul>\n<p dir=\"ltr\">N\u1ebfu b\u1ea1n mu\u1ed1n t\u0103ng ho\u1eb7c gi\u1ea3m, m\u1ecdi ng\u01b0\u1eddi s\u1ebd c\u1ea7n t\u0103ng ho\u1eb7c gi\u1ea3m m\u1ed9t trong hai y\u1ebfu t\u1ed1 n\u00e0y. Ho\u1eb7c c\u00f3 nh\u1eefng tr\u01b0\u1eddng h\u1ee3p t\u0103ng\/ gi\u1ea3m c\u1ea3 hai y\u1ebfu t\u1ed1 c\u00f9ng m\u1ed9t l\u00fac. Ch\u00fang ta c\u0169ng c\u00f3 th\u1ec3 n\u00f3i, kho\u1ea3ng c\u00e1ch di chuy\u1ec3n c\u00e0ng d\u00e0i, c\u00f4ng vi\u1ec7c v\u00e0 ng\u01b0\u1ee3c l\u1ea1i c\u00e0ng l\u1edbn. <\/p>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Cong_thuc_tinh_toan_co_hoc\"><\/span>C\u00f4ng th\u1ee9c t\u00ednh to\u00e1n c\u01a1 h\u1ecdc<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">Khi c\u00f3 hi\u1ec7u \u1ee9ng F tr\u00ean \u0111\u1ed1i t\u01b0\u1ee3ng, \u0111\u1ed1i t\u01b0\u1ee3ng sau \u0111\u00f3 di chuy\u1ec3n kho\u1ea3ng c\u00e1ch c\u1ee7a S, th\u00ec ch\u00fang ta c\u00f3 c\u00f4ng th\u1ee9c cho c\u00f4ng vi\u1ec7c c\u01a1 h\u1ecdc d\u1ef1a tr\u00ean F v\u00e0 S nh\u01b0 sau:<\/p>\n<table style=\"border-collapse: collapse;width: 100%;background-color: #c2e0f4;border-color: #4e4c50;border-style: solid\" border=\"1\">\n<tr>\n<td style=\"width: 99.0477%;text-align: center;border: 0.5px solid #4e4c50\">A = fs<\/td>\n<\/tr>\n<\/table>\n<p dir=\"ltr\">Ghi ch\u00fa:<\/p>\n<ul>\n<li dir=\"ltr\">A l\u00e0 l\u1ef1c l\u01b0\u1ee3ng c\u1ee7a l\u1ef1c f <\/li>\n<li dir=\"ltr\">F: L\u1ef1c l\u01b0\u1ee3ng h\u00e0nh \u0111\u1ed9ng tr\u00ean c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng (\u0111\u01a1n v\u1ecb NIUton: N) <\/li>\n<li dir=\"ltr\">S: Kho\u1ea3ng c\u00e1ch di chuy\u1ec3n (M) <\/li>\n<\/ul>\n<p dir=\"ltr\">Ch\u00fa \u00fd:<\/p>\n<ul>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">\u0110\u01a1n v\u1ecb SI c\u1ee7a c\u00f4ng ch\u00fang l\u00e0 Jun, bi\u1ec3u t\u01b0\u1ee3ng l\u00e0 J: \u0111\u01b0\u1ee3c \u0111\u1ecbnh ngh\u0129a l\u00e0 c\u00f4ng ch\u00fang \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n b\u1edfi m\u1ed9t Niuton l\u00e0m thay \u0111\u1ed5i m\u1ed9t \u0111o\u1ea1n c\u00f3 \u0111\u1ed9 d\u00e0i 1m. <\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">1 j = 1 n.1m = 1 nm, 1 kj = 1000 j <\/p>\n<\/li>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">C\u00f3 nhi\u1ec1u \u0111\u01a1n v\u1ecb kh\u00e1c nhau, v\u00ec v\u1eady khi gi\u1ea3i t\u1eadp c\u00e1c b\u00e0i t\u1eadp c\u1ee7a h\u1ecdc sinh, h\u1ecd c\u1ea7n chuy\u1ec3n \u0111\u1ed5i \u0111\u01a1n v\u1ecb theo ti\u00eau chu\u1ea9n v\u1edbi hai NIUton v\u00e0 m\u00e9t.<\/p>\n<\/li>\n<\/ul>\n<p>Xem th\u00eam: T\u00f3m t\u1eaft ki\u1ebfn \u200b\u200bth\u1ee9c v\u1ec1 l\u1ef1c l\u01b0\u1ee3ng x\u1ea5u (Archimedes) &amp; B\u00e0i t\u1eadp th\u1ef1c h\u00e0nh (V\u1eadt l\u00fd 8)<\/p>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Luu_y_khi_tinh_toan_co_hoc\"><\/span>L\u01b0u \u00fd khi t\u00ednh to\u00e1n c\u01a1 h\u1ecdc<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">H\u1ecdc sinh c\u1ea7n l\u01b0u \u00fd g\u00ec khi t\u00ednh to\u00e1n c\u00e1c sinh vi\u00ean c\u01a1 kh\u00ed? <\/p>\n<p dir=\"ltr\">C\u00f4ng th\u1ee9c tr\u00ean ch\u1ec9 \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng trong tr\u01b0\u1eddng h\u1ee3p \u0111\u1ed1i t\u01b0\u1ee3ng di chuy\u1ec3n c\u00f9ng v\u1edbi h\u01b0\u1edbng c\u1ee7a l\u1ef1c. <\/p>\n<ul>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">N\u1ebfu \u0111\u1ed1i t\u01b0\u1ee3ng di chuy\u1ec3n vu\u00f4ng g\u00f3c v\u1edbi l\u1ef1c, hi\u1ec7u su\u1ea5t c\u1ee7a l\u1ef1c \u0111\u00f3 b\u1eb1ng kh\u00f4ng. \u0110i\u1ec1u n\u00e0y gi\u00fap sinh vi\u00ean x\u00e1c \u0111\u1ecbnh r\u00f5 r\u00e0ng l\u1ef1c sinh l\u00e0 g\u00ec khi t\u00ednh to\u00e1n. <\/p>\n<\/li>\n<\/ul>\n<p dir=\"ltr\"><img decoding=\"async\" class=\"lazyload\" src=\"https:\/\/external-content.duckduckgo.com\/iu\/?u=https:\/\/vnmedia2.monkeyuni.net\/upload\/web\/img\/cong-co-hoc-1.png\" alt=\"V\u00ed d\u1ee5 minh h\u1ecda l\u00fd thuy\u1ebft c\u01a1 h\u1ecdc. (\u1ea2nh: B\u1ed9 s\u01b0u t\u1eadp Internet)\" width=\"800\"><\/p>\n<p dir=\"ltr\">V\u00ed d\u1ee5, m\u1ed9t chi\u1ebfc xe v\u1eabn c\u00f2n tr\u00ean \u0111\u01b0\u1eddng v\u00e0 ch\u1ecbu \u1ea3nh h\u01b0\u1edfng c\u1ee7a tr\u1ecdng l\u1ef1c P. Tr\u1ecdng l\u1ef1c \u1edf \u0111\u00e2y kh\u00f4ng t\u1ea1o ra v\u00ec n\u00f3 ho\u1ea1t \u0111\u1ed9ng tr\u00ean v\u1eadt th\u1ec3 nh\u01b0ng kh\u00f4ng khi\u1ebfn \u0111\u1ed1i t\u01b0\u1ee3ng di chuy\u1ec3n. Ch\u00fang t\u00f4i h\u00e0nh \u0111\u1ed9ng tr\u00ean m\u1ed9t l\u1ef1c ngang F., t\u1eeb tr\u00e1i sang ph\u1ea3i trong xe, n\u00f3 di chuy\u1ec3n. T\u1ea1i th\u1eddi \u0111i\u1ec3m n\u00e0y, tr\u1ecdng l\u1ef1c P c\u00f3 h\u01b0\u1edbng vu\u00f4ng g\u00f3c \u0111\u1ec3 l\u1ef1c F. v\u00ec l\u1ef1c P = 0 (ho\u1eb7c kh\u00f4ng th\u1ef1c hi\u1ec7n). <\/p>\n<ul>\n<li dir=\"ltr\">\n<p dir=\"ltr\" role=\"presentation\">C\u00e1c tr\u01b0\u1eddng h\u1ee3p kh\u00e1c: N\u1ebfu \u0111\u1ed1i t\u01b0\u1ee3ng di chuy\u1ec3n m\u00e0 kh\u00f4ng c\u00f3 h\u01b0\u1edbng c\u1ee7a l\u1ef1c, c\u00f4ng \u0111\u1ee9c \u0111\u01b0\u1ee3c t\u00ednh b\u1eb1ng m\u1ed9t c\u00f4ng th\u1ee9c kh\u00e1c (\u0111\u00e2y l\u00e0 ki\u1ebfn \u200b\u200bth\u1ee9c n\u00e2ng cao \u0111\u01b0\u1ee3c h\u1ecdc sau). <\/p>\n<\/li>\n<\/ul>\n<h2 dir=\"ltr\"><span class=\"ez-toc-section\" id=\"Giai_cac_bai_tap_co_hoc_vat_ly_8\"><\/span>Gi\u1ea3i c\u00e1c b\u00e0i t\u1eadp c\u01a1 h\u1ecdc v\u1eadt l\u00fd 8 <span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p dir=\"ltr\">\u0110\u1ec3 hi\u1ec3u th\u1ea5u \u0111\u00e1o b\u00e0i gi\u1ea3ng c\u00f4ng khai c\u01a1 h\u1ecdc, \u0111\u00e2y l\u00e0 c\u00e1c b\u00e0i t\u1eadp m\u1eabu m\u00e0 b\u1ea1n n\u00ean tham kh\u1ea3o <\/p>\n<p dir=\"ltr\">C\u00e2u C5 &#8211; SGK TR48: C\u00e1c chuy\u1ebfn t\u00e0u h\u00e0ng \u0111\u1ea7u k\u00e9o xe b\u1eb1ng l\u1ef1c F b\u1eb1ng 5000N \u0111\u1ec3 l\u00e0m m\u1ed9t toa xe \u0111i 1000m. Vui l\u00f2ng t\u00ednh to\u00e1n l\u1ef1c k\u00e9o c\u1ee7a \u0111\u1ea7u m\u00e1y? <\/p>\n<p dir=\"ltr\">Tr\u1ea3 l\u1eddi: A = FS = 5000.1000 = 5 000 000 (j) (= 5000 kJ) <\/p>\n<p dir=\"ltr\">C\u00e2u C6 &#8211; S\u00e1ch gi\u00e1o khoa TR48: M\u1ed9t qu\u1ea3 d\u1eeba c\u00f3 tr\u1ecdng l\u01b0\u1ee3ng 2kg r\u01a1i t\u1eeb c\u00e2y c\u00e1ch m\u1eb7t \u0111\u1ea5t 6m. Vui l\u00f2ng t\u00ednh to\u00e1n gi\u00e1 tr\u1ecb c\u1ee7a tr\u1ecdng l\u1ef1c? <\/p>\n<p dir=\"ltr\">Tr\u1ea3 l\u1eddi: <\/p>\n<p dir=\"ltr\">Ch\u00fang t\u00f4i t\u00ednh to\u00e1n tr\u1ecdng l\u01b0\u1ee3ng c\u1ee7a \u0111\u1ed1i t\u01b0\u1ee3ng: P = 10.M = 10.2 = 20 (n) <\/p>\n<p dir=\"ltr\">C\u00f4ng vi\u1ec7c c\u1ee7a tr\u1ecdng l\u1ef1c l\u00e0: a = fs = 20.6 = 120 (j) <\/p>\n<p dir=\"ltr\">C\u00e2u C7 &#8211; SGK TR48: T\u1ea1i sao kh\u00f4ng c\u00f3 s\u1ef1 \u0111\u00f3ng g\u00f3p c\u01a1 h\u1ecdc c\u1ee7a tr\u1ecdng l\u1ef1c khi \u0111\u00e1 c\u1ea9m th\u1ea1ch di chuy\u1ec3n tr\u00ean s\u00e0n ngang? <\/p>\n<p dir=\"ltr\">Tr\u1ea3 l\u1eddi: B\u1edfi v\u00ec \u0111\u00e1 c\u1ea9m th\u1ea1ch di chuy\u1ec3n tr\u00ean s\u00e0n ngang, tr\u1ecdng l\u1ef1c c\u00f3 h\u01b0\u1edbng th\u1eb3ng \u0111\u1ee9ng vu\u00f4ng g\u00f3c v\u1edbi chuy\u1ec3n \u0111\u1ed9ng c\u1ee7a v\u1eadt th\u1ec3, do \u0111\u00f3 kh\u00f4ng c\u00f3 s\u1ef1 \u0111\u00f3ng g\u00f3p c\u01a1 h\u1ecdc c\u1ee7a tr\u1ecdng l\u1ef1c. <\/p>\n<p dir=\"ltr\">C\u00e2u 13.4 &#8211; SBT: M\u1ed9t con ng\u1ef1a k\u00e9o m\u1ed9t chi\u1ebfc xe di chuy\u1ec3n v\u1edbi l\u1ef1c k\u00e9o l\u00e0 600n. Trong 5 ph\u00fat th\u1ef1c hi\u1ec7n l\u00e0 360 kJ. T\u00ednh t\u1ed1c \u0111\u1ed9 c\u1ee7a xe. <\/p>\n<p dir=\"ltr\">Tr\u1ea3 l\u1eddi: Ch\u00fang t\u00f4i thay \u0111\u1ed5i a = 360 kJ = 360000 j<\/p>\n<p dir=\"ltr\">5 ph\u00fat = 5,60s = 300s<\/p>\n<p dir=\"ltr\">Hi\u1ec7u su\u1ea5t c\u1ee7a l\u1ef1c F \u0111\u01b0\u1ee3c t\u00ednh b\u1eb1ng c\u00f4ng th\u1ee9c A = FS <\/p>\n<p dir=\"ltr\">Kho\u1ea3ng c\u00e1ch k\u00e9o ng\u1ef1a l\u00e0: s = a\/ f = 360000 j\/ 600 n = 600 m <\/p>\n<p dir=\"ltr\">V\u00ec v\u1eady, t\u1ed1c \u0111\u1ed9 c\u1ee7a xe l\u00e0: v = s\/t = 600 m\/300s = 2 m\/s <\/p>\n<p dir=\"ltr\">C\u00e2u 13.1 &#8211; SBT: M\u1ed9t nh\u00f3m sinh vi\u00ean \u0111\u00e3 \u0111\u1ea9y m\u1ed9t chi\u1ebfc xe t\u1ea3i \u0111\u1ea5t t\u1eeb \u200b\u200bA \u0111\u1ebfn B tr\u00ean m\u1ed9t con \u0111\u01b0\u1eddng ph\u1eb3ng ngang. \u0110\u1ebfn B, h\u1ecd \u0111\u1ed5 t\u1ea5t c\u1ea3 \u0111\u1ea5t v\u00e0o xe v\u00e0 sau \u0111\u00f3 \u0111\u1ea9y chi\u1ebfc xe m\u00e0 kh\u00f4ng \u0111i \u0111\u1ebfn con \u0111\u01b0\u1eddng c\u0169 \u0111\u1ebfn A. So s\u00e1nh s\u1ef1 ra \u0111\u1eddi \u1edf l\u01b0\u1ee3t \u0111i v\u00e0 s\u1ef1 tr\u1edf l\u1ea1i. \u0110i\u1ec1u n\u00e0o sau \u0111\u00e2y l\u00e0 ch\u00ednh x\u00e1c?<\/p>\n<p dir=\"ltr\">A. Ch\u00e2n \u0111\u1ea7u ti\u00ean b\u1eb1ng v\u1edbi ch\u1eb7ng th\u1ee9 hai v\u00ec \u0111\u01b0\u1eddng l\u00e0 nh\u01b0 nhau.<\/p>\n<p dir=\"ltr\">B. Ch\u00e2n \u0111\u1ea7u ti\u00ean l\u1edbn h\u01a1n v\u00ec l\u1ef1c k\u00e9o \u1edf ch\u1eb7ng \u0111\u1ea7u ti\u00ean l\u1edbn h\u01a1n l\u1ef1c k\u00e9o \u1edf ch\u1eb7ng th\u1ee9 hai.<\/p>\n<p dir=\"ltr\">C. C\u00f4ng vi\u1ec7c \u1edf ch\u1eb7ng th\u1ee9 hai l\u1edbn h\u01a1n v\u00ec xe kh\u00f4ng \u0111i nhanh h\u01a1n.<\/p>\n<p dir=\"ltr\">D. Ch\u00e2n \u0111\u1ea7u ti\u00ean nh\u1ecf h\u01a1n v\u00ec b\u00e3i \u0111\u1eadu xe n\u1eb7ng.<\/p>\n<p dir=\"ltr\">Tr\u1ea3 l\u1eddi: b <\/p>\n<p dir=\"ltr\">C\u00e2u 13.8 &#8211; SBT: M\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng tr\u01b0\u1ee3t tr\u1ecdng l\u01b0\u1ee3ng 2n tr\u00ean b\u1ea3ng l\u00e0 0,5m theo chi\u1ec1u ngang. C\u00f4ng vi\u1ec7c c\u1ee7a tr\u1ecdng l\u1ef1c l\u00e0?<\/p>\n<p dir=\"ltr\">A. 1J<\/p>\n<p dir=\"ltr\">B. 0J<\/p>\n<p dir=\"ltr\">C. 2J<\/p>\n<p dir=\"ltr\">D. 0,5J<\/p>\n<p dir=\"ltr\">Tr\u1ea3 l\u1eddi: B (V\u00ec tr\u1ecdng l\u1ef1c c\u00f3 h\u01b0\u1edbng vu\u00f4ng g\u00f3c v\u1edbi h\u01b0\u1edbng ngang, tr\u1ecdng l\u01b0\u1ee3ng c\u1ee7a tr\u1ecdng l\u1ef1c b\u1eb1ng 0J)<\/p>\n<p dir=\"ltr\">C\u00e2u 13.11 &#8211; SBT: M\u1ed9t ng\u01b0\u1eddi \u0111\u1ee9ng \u0111\u1ea7u m\u1ed9t chuy\u1ebfn t\u00e0u di chuy\u1ec3n t\u1eeb tr\u1ea1m A \u0111\u1ebfn tr\u1ea1m B trong 15 ph\u00fat v\u1edbi t\u1ed1c \u0111\u1ed9 30km\/h. T\u1ea1i Station B, t\u00e0u \u0111\u01b0\u1ee3c l\u00e0m t\u1eeb nhi\u1ec1u xe h\u01a1n v\u00e0 do \u0111\u00f3 chuy\u1ec3n t\u1eeb tr\u1ea1m B sang tr\u1ea1m C v\u1edbi t\u1ed1c \u0111\u1ed9 nh\u1ecf h\u01a1n 10km\/h. Th\u1eddi gian t\u1eeb tr\u1ea1m B \u0111\u1ebfn tr\u1ea1m l\u00e0 30 ph\u00fat. C\u00f4ng \u0111\u1ee9c c\u1ee7a ng\u01b0\u1eddi \u0111\u1ee9ng \u0111\u1ea7u t\u00e0u \u0111\u01b0\u1ee3c sinh ra r\u1eb1ng l\u1ef1c k\u00e9o c\u1ee7a ng\u01b0\u1eddi \u0111\u1ee9ng \u0111\u1ea7u t\u00e0u l\u00e0 40000N.<\/p>\n<p dir=\"ltr\">Tr\u1ea3 l\u1eddi: <\/p>\n<p dir=\"ltr\">Ch\u00fang ta c\u00f3: t1 = 15 ph\u00fat = \u00bc h <\/p>\n<p dir=\"ltr\">\u0110\u1eb7t V1 l\u00e0 t\u1ed1c \u0111\u1ed9 chuy\u1ec3n t\u1eeb Ga A sang Ga B <\/p>\n<p dir=\"ltr\">T\u1ed1c \u0111\u1ed9 chuy\u1ec3n \u0111\u1ed9ng t\u1eeb tr\u1ea1m B sang tr\u1ea1m l\u00e0 v2 = v1 &#8211; 10 = 20 km\/h <\/p>\n<p dir=\"ltr\">Ch\u00fang t\u00f4i t\u00ednh kho\u1ea3ng c\u00e1ch t\u1eeb t\u00e0u t\u1eeb tr\u1ea1m A \u0111\u1ebfn tr\u1ea1m B l\u00e0: S1 = v1.T1 = 30,1\/4 = 7,5 km<\/p>\n<p dir=\"ltr\">Kho\u1ea3ng c\u00e1ch \u0111\u1ebfn t\u00e0u t\u1eeb tr\u1ea1m B \u0111\u1ebfn tr\u1ea1m C l\u00e0: S2 = V2.T2 = 20.1\/2 = 10 km<\/p>\n<p dir=\"ltr\">Kho\u1ea3ng c\u00e1ch t\u1eeb tr\u1ea1m A \u0111\u1ebfn tr\u1ea1m l\u00e0:<\/p>\n<p dir=\"ltr\">S = S1 + S2 = 7,5 + 10 = 17,5km = 17500 m<\/p>\n<p dir=\"ltr\">V\u00ec v\u1eady, ng\u01b0\u1eddi l\u00e3nh \u0111\u1ea1o c\u1ee7a con t\u00e0u \u0111\u00e3 \u0111\u01b0\u1ee3c sinh ra: A = FS = 40000.17500 = 700000000 J<\/p>\n<p dir=\"ltr\">K\u1ebft lu\u1eadn<\/p>\n<p dir=\"ltr\">Th\u00f4ng qua b\u00e0i vi\u1ebft tr\u00ean, Shining Home &#8211; Gia \u0111\u00ecnh Anh Ng\u1eef hy v\u1ecdng r\u1eb1ng nh\u1eefng \u0111\u1ee9a tr\u1ebb \u0111\u00e3 hi\u1ec3u \u0111\u1ea7y \u0111\u1ee7 c\u00f4ng vi\u1ec7c c\u01a1 h\u1ecdc l\u00e0 g\u00ec. T\u1eeb \u0111\u00f3, gi\u1ea3i th\u00edch b\u1ea5t k\u1ef3 tr\u01b0\u1eddng h\u1ee3p hi\u1ec7u su\u1ea5t c\u00f4ng c\u1ed9ng, tr\u01b0\u1eddng h\u1ee3p n\u00e0o kh\u00f4ng th\u1ef1c hi\u1ec7n c\u00f4ng ch\u00fang. Ngo\u00e0i ra, hai y\u1ebfu t\u1ed1 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn c\u00f4ng \u0111\u1ee9c l\u00e0 c\u01b0\u1eddng \u0111\u1ed9 v\u00e0 kho\u1ea3ng c\u00e1ch c\u1ee7a \u0111\u1ed1i t\u01b0\u1ee3ng \u0111\u1ec3 bi\u1ebft c\u00e1ch gi\u1ea3i quy\u1ebft c\u00e1c b\u00e0i t\u1eadp c\u00f3 li\u00ean quan. \u0110\u1ec3 bi\u1ebft c\u00e1c b\u00e0i h\u1ecdc v\u1eadt l\u00fd h\u1eefu \u00edch h\u01a1n, h\u00e3y l\u00e0m theo ph\u1ea7n Ki\u1ebfn th\u1ee9c c\u01a1 b\u1ea3n ng\u00e0y h\u00f4m nay! <\/p>\n","protected":false},"excerpt":{"rendered":"<p>H\u00e3y t\u01b0\u1edfng t\u01b0\u1ee3ng tr\u01b0\u1eddng h\u1ee3p c\u1ee7a m\u1ed9t ng\u01b0\u1eddi d\u00f9ng c\u00f3 nhi\u1ec1u tr\u1ecdng l\u01b0\u1ee3ng n\u00e2ng tr\u1ecdng l\u01b0\u1ee3ng, anh ta \u0111ang \u1edf trong tr\u1ea1ng th\u00e1i c\u1ed1 \u0111\u1ecbnh, anh ta c\u00f3 l\u00e0m vi\u1ec7c kh\u00f4ng? V\u00e0 t\u1ea1i sao ch\u00fang ta c\u1ea7n nh\u1eadn ra b\u1ea5t k\u1ef3 tr\u01b0\u1eddng h\u1ee3p xu\u1ea5t hi\u1ec7n c\u01a1 h\u1ecdc, b\u1ea5t k\u1ef3 tr\u01b0\u1eddng h\u1ee3p n\u00e0o? \u0110\u1ec3 gi\u1ea3i th\u00edch&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[100],"tags":[],"class_list":["post-20602","post","type-post","status-publish","format-standard","hentry","category-kien-thuc"],"_links":{"self":[{"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/posts\/20602","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/comments?post=20602"}],"version-history":[{"count":1,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/posts\/20602\/revisions"}],"predecessor-version":[{"id":24661,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/posts\/20602\/revisions\/24661"}],"wp:attachment":[{"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/media?parent=20602"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/categories?post=20602"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ckconitsha.com\/vn\/wp-json\/wp\/v2\/tags?post=20602"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}