Thi k\u00e9o co l\u00e0 thi c\u00e1i g\u00ec? R\u1ea5t nhi\u1ec1u ng\u01b0\u1eddi s\u1ebd n\u00f3i: t\u1ea5t nhi\u00ean l\u00e0 thi xem s\u1ee9c l\u1ef1c c\u1ee7a \u0111\u1ed9i n\u00e0o l\u1edbn h\u01a1n \u0111\u1ea5y th\u00f4i! Tr\u00ean th\u1ef1c t\u1ebf, v\u1ea5n \u0111\u1ec1 kh\u00f4ng \u0111\u01a1n gi\u1ea3n nh\u01b0 v\u1eady.<\/p>\n\n\n\n
X\u00e9t t\u1eeb nguy\u00ean l\u00ed c\u01a1 h\u1ecdc, hai \u0111\u1ed9i tham gia k\u00e9o co, l\u1ef1c k\u00e9o gi\u1eefa h\u1ecd v\u1edbi nhau kh\u00f4ng h\u01a1n k\u00e9m bao nhi\u00eau. A \u0111\u1eb7t l\u00ean B m\u1ed9t l\u1ef1c k\u00e9o l\u1edbn bao nhi\u00eau th\u00ec B c\u0169ng \u0111\u1ed3ng th\u1eddi sinh ra \u0111\u1ed1i v\u1edbi A m\u1ed9t l\u1ef1c k\u00e9o l\u1edbn b\u1ea5y nhi\u00eau. Ng\u01b0\u1ee3c l\u1ea1i, t\u00ecnh h\u00ecnh B \u0111\u1ed1i v\u1edbi A c\u0169ng nh\u01b0 v\u1eady. \u0110\u00f3 l\u00e0 \u0111i\u1ec1u m\u00e0 \u0111\u1ecbnh lu\u1eadt th\u1ee9 ba c\u1ee7a Newton \u0111\u00e3 x\u00e1c \u0111\u1ecbnh. T\u1ee9c l\u00e0 khi v\u1eadt th\u1ec3 A t\u00e1c \u0111\u1ed9ng m\u1ed9t l\u1ef1c l\u00ean v\u1eadt th\u1ec3 B, v\u1eadt th\u1ec3 B c\u0169ng \u0111\u1ed3ng th\u1eddi t\u00e1c \u0111\u1ed9ng m\u1ed9t ph\u1ea3n l\u1ef1c l\u00ean v\u1eadt th\u1ec3 A. L\u1ef1c v\u00e0 ph\u1ea3n l\u1ef1c b\u1eb1ng nhau v\u1ec1 \u0111\u1ed9 l\u1edbn, t\u00e1c \u0111\u1ed9ng ng\u01b0\u1ee3c chi\u1ec1u nhau, v\u00e0 c\u00f9ng \u1edf tr\u00ean m\u1ed9t \u0111\u01b0\u1eddng th\u1eb3ng. C\u00f3 th\u1ec3 th\u1ea5y l\u00e0 l\u1ef1c k\u00e9o gi\u1eefa hai b\u00ean kh\u00f4ng ph\u1ea3i l\u00e0 nh\u00e2n t\u1ed1 quy\u1ebft \u0111\u1ecbnh th\u1eafng thua.<\/p>\n\n\n\n
V\u1eady c\u00e1i g\u00ec m\u1edbi l\u00e0 nh\u00e2n t\u1ed1 th\u1ef1c s\u1ef1 quy\u1ebft \u0111\u1ecbnh s\u1ef1 \u0111\u01b0\u1ee3c thua c\u1ee7a cu\u1ed9c thi k\u00e9o co? M\u1ed9t l\u00e0, tay nh\u1ea5t \u0111\u1ecbnh ph\u1ea3i gi\u1eef ch\u1eb7t s\u1ee3i d\u00e2y th\u1eebng, d\u1ef1a v\u00e0o l\u1ef1c ma s\u00e1t gi\u1eefa tay v\u00e0 d\u00e2y th\u1eebng \u0111\u1ec3 ng\u0103n kh\u00f4ng cho d\u00e2y tu\u1ed9t ra kh\u1ecfi tay. Hai l\u00e0 ph\u1ea3i l\u00e0m cho m\u1eb7t \u0111\u1ea5t c\u00f3 l\u1ef1c ma s\u00e1t \u0111\u1ee7 l\u1edbn \u0111\u1ed1i v\u1edbi b\u00e0n ch\u00e2n c\u1ee7a nh\u1eefng ng\u01b0\u1eddi k\u00e9o co \u0111\u1ec3 ch\u1ed1ng l\u1ea1i l\u1ef1c k\u00e9o c\u1ee7a \u0111\u1ed1i ph\u01b0\u01a1ng. C\u00f3 th\u1ec3 n\u00f3i, ch\u1ec9 c\u1ea7n tay n\u1eafm ch\u1eb7t d\u00e2y th\u1eebng, l\u1ef1c th\u1ef1c s\u1ef1 khi k\u00e9o co \u0111\u1ebfn t\u1eeb ch\u00e2n c\u1ee7a ng\u01b0\u1eddi, t\u1ee9c l\u00e0 l\u1ef1c ma s\u00e1t gi\u1eefa b\u00e0n ch\u00e2n v\u00e0 m\u1eb7t \u0111\u1ea5t. L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 c\u00f3 th\u1ec3 t\u0103ng l\u1ef1c ma s\u00e1t \u0111\u00f3 l\u00ean? Tr\u01b0\u1edbc h\u1ebft, \u0111i lo\u1ea1i gi\u00e0y d\u01b0\u1edbi \u0111\u1ebf c\u00f3 hoa v\u0103n l\u1ed3i l\u00f5m, c\u00f3 th\u1ec3 gia t\u0103ng h\u1ec7 s\u1ed1 ma s\u00e1t, l\u00e0m cho l\u1ef1c ma s\u00e1t t\u0103ng l\u00ean. Th\u00eam n\u1eefa, tr\u1ecdng l\u01b0\u1ee3ng c\u01a1 th\u1ec3 c\u1ee7a nh\u1eefng ng\u01b0\u1eddi k\u00e9o c\u00e0ng n\u1eb7ng, \u00e1p l\u1ef1c \u0111\u1ed1i v\u1edbi m\u1eb7t \u0111\u1ea5t c\u00e0ng l\u1edbn, l\u1ef1c ma s\u00e1t c\u0169ng s\u1ebd t\u0103ng l\u00ean.<\/p>\n\n\n\n
Ng\u01b0\u1eddi l\u1edbn v\u00e0 tr\u1ebb con k\u00e9o co, ng\u01b0\u1eddi l\u1edbn th\u1eafng d\u1ec5 d\u00e0ng, m\u1ea5u ch\u1ed1t l\u00e0 \u1edf ch\u1ed7 ng\u01b0\u1eddi l\u1edbn c\u00f3 tr\u1ecdng l\u01b0\u1ee3ng c\u01a1 th\u1ec3 l\u1edbn h\u01a1n c\u1ee7a tr\u1ebb con.<\/p>\n\n\n\n
C\u1ed1 nhi\u00ean, trong cu\u1ed9c thi k\u00e9o co th\u1ef1c t\u1ebf, vi\u1ec7c th\u1eafng thua ph\u1ee5 thu\u1ed9c r\u1ea5t l\u1edbn v\u00e0o m\u1ee9c \u0111\u1ed9 k\u0129 x\u1ea3o c\u1ee7a ng\u01b0\u1eddi tham gia. V\u00ed d\u1ee5 nh\u01b0, ch\u00e2n c\u1ed1 s\u1ee9c gi\u1eabm xu\u1ed1ng \u0111\u1ea5t, trong th\u1eddi gian ng\u1eafn c\u00f3 th\u1ec3 sinh ra \u00e1p l\u1ef1c \u0111\u1ed1i v\u1edbi m\u1eb7t \u0111\u1ea5t v\u01b0\u1ee3t qu\u00e1 tr\u1ecdng l\u01b0\u1ee3ng c\u01a1 th\u1ec3 c\u1ee7a m\u00ecnh. Ho\u1eb7c ng\u1eeda ng\u01b0\u1eddi ra ph\u00eda sau, d\u1ef1a v\u00e0o l\u1ef1c k\u00e9o c\u1ee7a \u0111\u1ed1i ph\u01b0\u01a1ng \u0111\u1ec3 t\u0103ng \u00e1p l\u1ef1c \u0111\u1ed1i v\u1edbi m\u1eb7t \u0111\u1ea5t, v.v. M\u1ee5c \u0111\u00edch \u0111\u1ec1u l\u00e0 t\u00ecm m\u1ecdi c\u00e1ch l\u00e0m t\u0103ng l\u1ef1c ma s\u00e1t c\u1ee7a m\u1eb7t \u0111\u1ea5t \u0111\u1ed1i v\u1edbi b\u00e0n ch\u00e2n \u0111\u1ec3 gi\u00e0nh l\u1ea5y th\u1eafng l\u1ee3i c\u1ee7a cu\u1ed9c thi.<\/p>\n\n\n\n
T\u1eeb kho\u00e1: K\u00e9o co; L\u1ef1c; Ph\u1ea3n l\u1ef1c; L\u1ef1c ma s\u00e1t; \u0110\u1ecbnh lu\u1eadt th\u1ee9 ba c\u1ee7a<\/p>\n\n\n\n
<\/p>\n\n\n\n\n\n\n","protected":false},"excerpt":{"rendered":"
Thi k\u00e9o co l\u00e0 thi c\u00e1i g\u00ec? R\u1ea5t nhi\u1ec1u ng\u01b0\u1eddi s\u1ebd n\u00f3i: t\u1ea5t nhi\u00ean l\u00e0 thi xem s\u1ee9c l\u1ef1c c\u1ee7a \u0111\u1ed9i n\u00e0o l\u1edbn h\u01a1n \u0111\u1ea5y th\u00f4i! Tr\u00ean th\u1ef1c t\u1ebf, v\u1ea5n \u0111\u1ec1 kh\u00f4ng \u0111\u01a1n gi\u1ea3n nh\u01b0 v\u1eady. X\u00e9t t\u1eeb nguy\u00ean l\u00ed c\u01a1 h\u1ecdc, hai \u0111\u1ed9i tham gia k\u00e9o co, l\u1ef1c k\u00e9o gi\u1eefa h\u1ecd v\u1edbi nhau kh\u00f4ng […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_disable_autopaging":false},"categories":[15,7],"tags":[],"class_list":["post-5547","post","type-post","status-publish","format-standard","hentry","category-hoi-dap-khoa-hoc","category-vat-ly"],"_links":{"self":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/5547","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/comments?post=5547"}],"version-history":[{"count":0,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/5547\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=5547"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=5547"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=5547"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}