{"id":3364,"date":"2021-10-20T16:55:34","date_gmt":"2021-10-20T09:55:34","guid":{"rendered":"https:\/\/www.vietlearn.org\/post\/?p=3364"},"modified":"2021-10-20T16:55:35","modified_gmt":"2021-10-20T09:55:35","slug":"luc-la-gi-khai-niem-phan-loai-don-vi-tinh-ung-dung","status":"publish","type":"post","link":"https:\/\/www.vietlearn.org\/kien-thuc\/luc-la-gi-khai-niem-phan-loai-don-vi-tinh-ung-dung\/","title":{"rendered":"L\u1ef1c l\u00e0 g\u00ec \u2013 Kh\u00e1i ni\u1ec7m, Ph\u00e2n lo\u1ea1i, \u0111\u01a1n v\u1ecb t\u00ednh, \u1ee9ng d\u1ee5ng"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Ghi ch\u00fa: T\u00e0i li\u1ec7u tr\u00edch d\u1eabn<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">L\u1ef1c l\u00e0 m\u1ed9t trong nh\u1eefng ki\u1ebfn th\u1ee9c quan tr\u1ecdng trong ch\u01b0\u01a1ng tr\u00ecnh V\u1eadt l\u00fd 6, \u0111\u1ea1i l\u01b0\u1ee3ng n\u00e0y xu\u1ea5t hi\u1ec7n r\u1ea5t nhi\u1ec1u trong m\u1ecdi ho\u1ea1t \u0111\u1ed9ng s\u1ed1ng c\u1ee7a ch\u00fang ta. N\u1ebfu hai ng\u01b0\u1eddi \u0111\u1ea9y nhau th\u00ec m\u1ed9t ng\u01b0\u1eddi s\u1ebd t\u00e1c d\u1ee5ng l\u1ef1c \u0111\u1ea9y v\u00e0 m\u1ed9t ng\u01b0\u1eddi l\u00e0 t\u00e1c d\u1ee5ng l\u1ef1c k\u00e9o. V\u1eady l\u1ef1c l\u00e0 g\u00ec? Hai l\u1ef1c c\u00e2n b\u1eb1ng l\u00e0 g\u00ec? C\u00e2u tr\u1ea3 l\u1eddi s\u1ebd c\u00f3 trong n\u1ed9i dung th\u00f4ng tin chi ti\u1ebft d\u01b0\u1edbi \u0111\u00e2y.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">L\u1ef1c l\u00e0 g\u00ec? C\u00e1c kh\u00e1i ni\u1ec7m li\u00ean quan<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110\u1ecbnh ngh\u0129a l\u1ef1c trong v\u1eadt l\u00fd l\u00e0 b\u1ea5t k\u1ef3 \u1ea3nh h\u01b0\u1edfng n\u00e0o l\u00e0m cho m\u1ed9t v\u1eadt th\u1ec3 ch\u1ecbu s\u1ef1 thay \u0111\u1ed5i ho\u1eb7c l\u00e0m \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn chuy\u1ec3n \u0111\u1ed9ng, h\u01b0\u1edbng c\u1ee7a n\u00f3 hay c\u1ea5u tr\u00fac h\u00ecnh h\u1ecdc c\u1ee7a n\u00f3. Hi\u1ec3u m\u1ed9t c\u00e1ch kh\u00e1c th\u00ec l\u1ef1c l\u00e0 nguy\u00ean nh\u00e2n l\u00e0m cho m\u1ed9t v\u1eadt c\u00f3 kh\u1ed1i l\u01b0\u1ee3ng thay \u0111\u1ed5i v\u1eadn t\u1ed1c, hay l\u00e0m bi\u1ebfn d\u1ea1ng v\u1eadt th\u1ec3 ho\u1eb7c c\u1ea3 2.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Hi\u1ec3u \u0111\u01a1n gi\u1ea3n l\u1ef1c l\u00e0 \u0111\u1ea1i l\u01b0\u1ee3ng vect\u01a1 \u0111\u1eb7c tr\u01b0ng cho t\u00e1c d\u1ee5ng c\u1ee7a v\u1eadt l\u00ean v\u1eadt kh\u00e1c m\u00e0 t\u1ea1o ra gia t\u1ed1c cho v\u1eadt ho\u1eb7c l\u00e0m v\u1eadt bi\u1ebfn d\u1ea1ng. Ph\u01b0\u01a1ng c\u1ee7a l\u1ef1c kh\u00f4ng c\u1ed1 \u0111\u1ecbnh v\u00e0 t\u00f9y thu\u1ed9c v\u00e0o t\u00ednh ch\u1ea5t, \u0111\u1eb7c \u0111i\u1ec3m c\u1ee7a c\u00e1c lo\u1ea1i l\u1ef1c kh\u00e1c nhau n\u00ean m\u1ed7i l\u1ef1c \u0111\u1ec1u c\u00f3 ph\u01b0\u01a1ng v\u00e0 chi\u1ec1u x\u00e1c \u0111\u1ecbnh. D\u1ee5ng c\u1ee5 \u0111o l\u1ef1c l\u00e0 l\u1ef1c k\u1ebf, \u0111\u01a1n v\u1ecb l\u1ef1c l\u00e0 Niut\u01a1n, k\u00ed hi\u1ec7u l\u00e0 N.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Th\u1ebf n\u00e0o l\u00e0 hai l\u1ef1c c\u00e2n b\u1eb1ng?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Hai l\u1ef1c c\u00e2n b\u1eb1ng l\u00e0 g\u00ec? L\u00e0 hai l\u1ef1c c\u00f3 \u0111\u1ed9 l\u1edbn nh\u01b0 nhau hay c\u00f2n hi\u1ec3u l\u00e0 m\u1ea1nh nh\u01b0 nhau. Hai l\u1ef1c c\u00e2n b\u1eb1ng c\u00f3 c\u00f9ng ph\u01b0\u01a1ng nh\u01b0ng ng\u01b0\u1ee3c chi\u1ec1u v\u00e0 ph\u1ea3i c\u00f9ng t\u00e1c d\u1ee5ng v\u00e0o m\u1ed9t v\u1eadt.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">N\u1ebfu ch\u1ec9 c\u00f3 2 l\u1ef1c t\u00e1c c\u00f9ng t\u00e1c d\u1ee5ng v\u00e0o m\u1ed9t v\u1eadt m\u00e0 v\u1eadt \u0111\u00f3 \u0111\u1ee9ng y\u00ean th\u00ec g\u1ecdi l\u00e0 hai l\u1ef1c c\u00e2n b\u1eb1ng.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">V\u00ed d\u1ee5 v\u1ec1 hai l\u1ef1c c\u00e2n b\u1eb1ng: Hai \u0111\u1ed9i \u0111ang k\u00e9o co, hai b\u1ea1n \u0111ang g\u1ed3ng tay.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110\u1eb7c \u0111i\u1ec3m c\u1ee7a l\u1ef1c<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">G\u1ed1c t\u1ea1i \u0111i\u1ec3m \u0111\u1eb7t l\u1ef1c<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ph\u01b0\u01a1ng, chi\u1ec1u l\u00e0 ph\u01b0\u01a1ng chi\u1ec1u c\u1ee7a l\u1ef1c<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0110\u1ed9 d\u00e0i c\u1ee7a l\u1ef1c s\u1ebd t\u1ef7 l\u1ec7 v\u1edbi c\u01b0\u1eddng \u0111\u1ed9 l\u1ef1c theo m\u1ed9t t\u1ef7 l\u1ec7 cho tr\u01b0\u1edbc<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">K\u00ed hi\u1ec7u c\u1ee7a l\u1ef1c l\u00e0 F<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">C\u00e1c lo\u1ea1i l\u1ef1c c\u01a1 h\u1ecdc hi\u1ec7n nay<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">L\u1ef1c c\u01a1 h\u1ecdc l\u00e0 m\u1ed9t \u0111\u1ea1i l\u01b0\u1ee3ng vect\u01a1 c\u00f3 \u0111i\u1ec3m \u0111\u1eb7t, ph\u01b0\u01a1ng, chi\u1ec1u v\u00e0 \u0111\u1ed9 l\u1edbn. L\u1ef1c c\u01a1 h\u1ecdc \u0111\u01b0\u1ee3c chia th\u00e0nh l\u1ef1c h\u1ea5p d\u1eabn, l\u1ef1c \u0111\u00e0n h\u1ed3i, l\u1ef1c ma s\u00e1t v\u00e0 l\u1ef1c h\u01b0\u1edbng t\u00e2m.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">L\u1ef1c h\u1ea5p d\u1eabn<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">L\u1ef1c h\u1ea5p d\u1eabn l\u00e0 l\u1ef1c h\u00fat gi\u1eefa m\u1ecdi v\u1eadt ch\u1ea5t, c\u00f3 \u0111\u1ed9 l\u1edbn t\u1ec9 l\u1ec7 v\u1edbi kh\u1ed1i l\u01b0\u1ee3ng c\u1ee7a ch\u00fang. L\u1ef1c h\u1ea5p d\u1eabn c\u1ee7a Tr\u00e1i \u0110\u1ea5t s\u1ebd t\u00e1c \u0111\u1ed9ng l\u00ean c\u00e1c v\u1eadt c\u00f3 kh\u1ed1i l\u01b0\u1ee3ng l\u00e0m cho ch\u00fang r\u01a1i xu\u1ed1ng \u0111\u1ea5t. L\u1ef1c n\u00e0y gi\u00fap g\u1eafn k\u1ebft c\u00e1c v\u1eadt ch\u1ea5t \u0111\u1ec3 h\u00ecnh th\u00e0nh Tr\u00e1i \u0110\u1ea5t, M\u1eb7t Tr\u1eddi hay c\u00e1c thi\u00ean th\u1ec3, n\u1ebfu kh\u00f4ng c\u00f3 n\u00f3 th\u00ec c\u00e1c th\u1ec3 s\u1ebd kh\u00f4ng li\u00ean k\u1ebft \u0111\u01b0\u1ee3c v\u1edbi nhau v\u00e0 cu\u1ed9c s\u1ed1ng s\u1ebd kh\u00f4ng t\u1ed3n t\u1ea1i. L\u1ef1c h\u1ea5p d\u1eabn l\u00e0m cho c\u00e1c h\u00e0nh tinh quay quanh m\u1eb7t tr\u1eddi.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">L\u1ef1c h\u1ea5p d\u1eabn c\u00f3 \u0111i\u1ec3m \u0111\u1eb7t t\u1ea1i t\u00e2m c\u1ee7a v\u1eadt, c\u00f9ng ph\u01b0\u01a1ng v\u00e0 ng\u01b0\u1ee3c chi\u1ec1u, c\u00f4ng th\u1ee9c t\u00ednh \u0111\u00f3 l\u00e0:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Trong \u0111\u00f3:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Fhd : L\u00e0 l\u1ef1c h\u1ea5p d\u1eabn<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">m1, m2: L\u00e0 kh\u1ed1i l\u01b0\u1ee3ng c\u1ee7a 2 v\u1eadt<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">R: L\u00e0 kho\u1ea3ng c\u00e1ch gi\u1eefa 2 ch\u1ea5t \u0111i\u1ec3m<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">G: l\u00e0 h\u1eb1ng s\u1ed1 h\u1ea5p d\u1eabn.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">L\u1ef1c \u0111\u00e0n h\u1ed3i<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">L\u1ef1c \u0111\u00e0n h\u1ed3i l\u00e0 l\u1ef1c \u0111\u01b0\u1ee3c sinh ra khi v\u1eadt \u0111\u00e0n h\u1ed3i b\u1ecb bi\u1ebfn d\u1ea1ng. Ch\u1eb3ng h\u1ea1n nh\u01b0 l\u1ef1c g\u00e2y ra b\u1edfi m\u1ed9t l\u00f2 xo khi b\u1ecb n\u00e9n l\u1ea1i ho\u1eb7c k\u00e9o gi\u00e3n ra. L\u1ef1c \u0111\u00e0n h\u1ed3i c\u00f3 xu h\u01b0\u1edbng ch\u1ed1ng l\u1ea1i nguy\u00ean nh\u00e2n sinh ra n\u00f3 t\u1ee9c l\u00e0 n\u00f3 s\u1ebd \u0111\u01b0a v\u1eadt tr\u1edf l\u1ea1i tr\u1ea1ng th\u00e1i ban \u0111\u1ea7u khi ch\u01b0a b\u1ecb bi\u1ebfn d\u1ea1ng.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">L\u1ef1c \u0111\u00e0n h\u1ed3i s\u1ebd c\u00f3 ph\u01b0\u01a1ng tr\u00f9ng v\u1edbi l\u1ef1c c\u1ee7a l\u00f2 xo, c\u00f3 chi\u1ec1u ch\u1ed1ng l\u1ea1i s\u1ef1 bi\u1ebfn d\u1ea1ng, c\u00f4ng th\u1ee9c t\u00ednh s\u1ebd l\u00e0:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Fdh= k x |\u2206l|<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Trong \u0111\u00f3<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">k l\u00e0 h\u1ec7 s\u1ed1 \u0111\u00e0n h\u1ed3i c\u1ee7a l\u00f2 xo<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u2206l l\u00e0 \u0111\u1ed9 bi\u1ebfn d\u1ea1ng c\u1ee7a l\u00f2 xo<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">L\u1ef1c ma s\u00e1t<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">L\u1ef1c ma s\u00e1t l\u00e0 l\u1ef1c c\u1ea3n tr\u1edf s\u1ef1 chuy\u1ec3n \u0111\u1ed9ng, xu\u1ea5t hi\u1ec7n t\u1ea1i m\u1eb7t ti\u1ebfp x\u00fac gi\u1eefa 2 b\u1ec1 m\u1eb7t v\u1eadt ch\u1ea5t, ch\u1ed1ng l\u1ea1i s\u1ef1 thay \u0111\u1ed5i v\u1ecb tr\u00ed t\u01b0\u01a1ng \u0111\u1ed1i gi\u1eefa 2 b\u1ec1 m\u1eb7t. G\u1ed3m c\u00f3 l\u1ef1c ma s\u00e1t tr\u01b0\u1ee3t, ma s\u00e1t ngh\u1ec9, ma s\u00e1t l\u0103n nh\u01b0ng ph\u1ed5 bi\u1ebfn nh\u1ea5t l\u00e0 l\u1ef1c ma s\u00e1t tr\u01b0\u1ee3t.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">L\u1ef1c ma s\u00e1t c\u00f3 \u0111i\u1ec3m \u0111\u1eb7t l\u00ean v\u1eadt s\u00e1t b\u1ec1 m\u1eb7t ti\u1ebfp x\u00fac, ph\u01b0\u01a1ng song song v\u1edbi b\u1ec1 m\u1eb7t ti\u1ebfp x\u00fac, c\u00f3 chi\u1ec1u ng\u01b0\u1ee3c v\u1edbi chuy\u1ec3n \u0111\u1ed9ng t\u01b0\u01a1ng \u0111\u1ed1i so v\u1edbi b\u1ec1 m\u1eb7t ti\u1ebfp x\u00fac, c\u00f4ng th\u1ee9c t\u00ednh :<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Trong \u0111\u00f3:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u03bct: l\u00e0 h\u1ec7 s\u1ed1 ma s\u00e1t ph\u1ee5 thu\u1ed9c v\u00e0o b\u1ec1 m\u1eb7t ti\u1ebfp x\u00fac c\u1ee7a 2 v\u1eadt<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">N: l\u00e0 \u00e1p l\u1ef1c c\u1ee7a hai v\u1eadt<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">L\u1ef1c h\u01b0\u1edbng t\u00e2m l\u00e0 lo\u1ea1i l\u1ef1c t\u00e1c d\u1ee5ng v\u00e0o m\u1ed9t v\u1eadt chuy\u1ec3n \u0111\u1ed9ng tr\u00f2n \u0111\u1ec1u, g\u00e2y ra cho v\u1eadt gia t\u1ed1c h\u01b0\u1edbng t\u00e2m. L\u1ef1c h\u01b0\u1edbng t\u00e2m c\u00f3 \u0111i\u1ec3m \u0111\u1eb7t l\u00ean v\u1eadt, c\u00f3 ph\u01b0\u01a1ng tr\u00f9ng v\u1edbi \u0111\u01b0\u1eddng th\u1eb3ng n\u1ed1i v\u1eadt v\u00e0 t\u00e2m qu\u1ef9 \u0111\u1ea1o, chi\u1ec1u t\u1eeb v\u1eadt h\u01b0\u1edbng v\u00e0o t\u00e2m qu\u1ef9 \u0111\u1ea1o. C\u00f4ng th\u1ee9c t\u00ednh :<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Fht=m\u00d7aht=m\u00d7v2r=m\u00d7\u03c92\u00d7r<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Trong \u0111\u00f3:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">r l\u00e0 b\u00e1n k\u00ednh qu\u1ef9 \u0111\u1ea1o<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">m l\u00e0 kh\u1ed1i l\u01b0\u1ee3ng c\u1ee7a v\u1eadt (kg)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">l\u00e0 t\u1ea7n s\u1ed1 g\u00f3c c\u1ee7a chuy\u1ec3n \u0111\u1ed9ng<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">v l\u00e0 v\u1eadn t\u1ed1c d\u00e0i c\u1ee7a chuy\u1ec3n \u0111\u1ed9ng<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Mong r\u1eb1ng nh\u1eefng th\u00f4ng tin trong b\u00e0i vi\u1ebft tr\u00ean \u0111\u00e2y s\u1ebd gi\u00fap b\u1ea1n tr\u1ea3 l\u1eddi \u0111\u01b0\u1ee3c c\u00e2u h\u1ecfi l\u1ef1c l\u00e0 g\u00ec? \u0110\u1eb7c \u0111i\u1ec3m c\u1ee7a l\u1ef1c. N\u1ebfu c\u00e1c b\u1ea1n c\u00f3 b\u1ea5t k\u1ef3 th\u1eafc m\u1eafc n\u00e0o li\u00ean quan \u0111\u1ebfn v\u1ea5n \u0111\u1ec1 n\u00e0y h\u00e3y comment ph\u00eda d\u01b0\u1edbi b\u00e0i vi\u1ebft \u0111\u1ec3 Vietlearn.org gi\u1ea3i \u0111\u00e1p nhanh ch\u00f3ng v\u00e0 mi\u1ec5n ph\u00ed ho\u00e0n to\u00e0n.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n\n\n\n","protected":false},"excerpt":{"rendered":"<p>Ghi ch\u00fa: T\u00e0i li\u1ec7u tr\u00edch d\u1eabn L\u1ef1c l\u00e0 m\u1ed9t trong nh\u1eefng ki\u1ebfn th\u1ee9c quan tr\u1ecdng trong ch\u01b0\u01a1ng tr\u00ecnh V\u1eadt l\u00fd 6, \u0111\u1ea1i l\u01b0\u1ee3ng n\u00e0y xu\u1ea5t hi\u1ec7n r\u1ea5t nhi\u1ec1u trong m\u1ecdi ho\u1ea1t \u0111\u1ed9ng s\u1ed1ng c\u1ee7a ch\u00fang ta. N\u1ebfu hai ng\u01b0\u1eddi \u0111\u1ea9y nhau th\u00ec m\u1ed9t ng\u01b0\u1eddi s\u1ebd t\u00e1c d\u1ee5ng l\u1ef1c \u0111\u1ea9y v\u00e0 m\u1ed9t ng\u01b0\u1eddi l\u00e0 t\u00e1c d\u1ee5ng [&hellip;]<\/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":[1],"tags":[],"class_list":["post-3364","post","type-post","status-publish","format-standard","hentry","category-general"],"_links":{"self":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/3364","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=3364"}],"version-history":[{"count":0,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/3364\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=3364"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=3364"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=3364"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}