Ghi ch\u00fa: T\u00e0i li\u1ec7u tr\u00edch d\u1eabn<\/p>\n\n\n\n
Trong ch\u01b0\u01a1ng tr\u00ecnh v\u1eadt l\u00fd l\u1edbp 6, c\u00e1c em s\u1ebd \u0111\u01b0\u1ee3c ti\u1ebfp c\u1eadn v\u1edbi m\u1ed9t ki\u1ebfn th\u1ee9c m\u1edbi v\u1ec1 l\u1ef1c. \u0110\u1ecbnh lu\u1eadt H\u00fac \u0111\u01b0\u1ee3c bi\u1ebft \u0111\u1ebfn l\u00e0 m\u1ed9t trong nh\u1eefng ki\u1ebfn th\u1ee9c ti\u00eau bi\u1ec3u v\u1ec1 l\u1ef1c t\u00e1c d\u1ee5ng. Bi\u1ebft \u0111\u1ebfn \u0111\u1ecbnh lu\u1eadt n\u00e0y, c\u00e1c em c\u00f3 th\u1ec3 \u00e1p d\u1ee5ng \u0111\u01b0\u1ee3c nhi\u1ec1u trong cu\u1ed9c s\u1ed1ng h\u1eb1ng ng\u00e0y, c\u0169ng nh\u01b0 t\u00ednh to\u00e1n b\u00e0i t\u1eadp. \u0110\u1ecbnh lu\u1eadt n\u00e0y \u0111\u01b0\u1ee3c g\u1eafn li\u1ec1n v\u1edbi l\u1ef1c \u0111\u00e0n h\u1ed3i c\u1ee7a l\u00f2 xo. L\u00fd thuy\u1ebft trong s\u00e1ch c\u00f3 th\u1ec3 s\u1ebd kh\u00f4 khan v\u00e0 kh\u00f3 hi\u1ec3u. \u0110\u1ec3 gi\u1ea3i \u0111\u00e1p \u0111\u01b0\u1ee3c v\u1ea5n \u0111\u1ec1 n\u00e0y cho c\u00e1c em h\u1ecdc sinh<\/a>. B\u00e0i vi\u1ebft ng\u00e0y h\u00f4m nay c\u1ee7a ch\u00fang t\u00f4i s\u1ebd \u0111em \u0111\u1ebfn cho c\u00e1c em nh\u1eefng \u0111\u1ecbnh ngh\u0129a, v\u00ed d\u1ee5 d\u1ec5 hi\u1ec3u nh\u1ea5t. C\u00e1c em h\u00e3y \u0111\u1ecdc v\u00e0 ghi nh\u1edb nh\u1eefng v\u00ed d\u1ee5 ti\u00eau bi\u1ec3u nh\u00e9!<\/p>\n\n\n\n L\u1ef1c \u0111\u00e0n h\u1ed3i c\u1ee7a l\u00f2 xo<\/p>\n\n\n\n Tr\u01b0\u1edbc khi \u0111\u1ebfn v\u1edbi \u0111\u1ecbnh lu\u1eadt H\u00fac, ch\u00fang ta c\u1ea7n ph\u1ea3i t\u00ecm hi\u1ec3u v\u1ec1 l\u1ef1c \u0111\u00e0n h\u1ed3i c\u1ee7a l\u00f2 xo. \u0110\u00e2y s\u1ebd l\u00e0 nh\u1eefng \u0111i\u1ec1u c\u01a1 b\u1ea3n \u0111\u1ec3 c\u00e1c em c\u00f3 th\u1ec3 li\u00ean k\u1ebft v\u1edbi \u0111\u1ecbnh lu\u1eadt \u0111\u01b0\u1ee3c h\u1ecdc. Nh\u01b0 ch\u00fang ta \u0111\u00e3 bi\u1ebft, l\u00f2 xo l\u00e0 m\u1ed9t v\u1eadt c\u00f3 th\u1ec3 n\u00e9n, gi\u00e3n t\u00f9y thu\u1ed9c v\u00e0o l\u1ef1c t\u00e1c d\u1ee5ng. Khi ch\u00fang ta t\u00e1c \u0111\u1ed9ng l\u00ean l\u00f2 xo m\u1ed9t l\u1ef1c n\u00e9n, sau khi th\u1ea3 ra, l\u00f2 xo s\u1ebd tr\u1edf v\u1ec1 tr\u1ea1ng th\u00e1i h\u00ecnh d\u1ea1ng ban \u0111\u1ea7u. Nh\u01b0 v\u1eady, ta c\u00f3 th\u1ec3 n\u00f3i, l\u00f2 xo \u0111\u00e3 \u0111\u00e0n h\u1ed3i tr\u1edf v\u1ec1 h\u00ecnh d\u00e1ng ban \u0111\u1ea7u.<\/p>\n\n\n\n T\u00ecm hi\u1ec3u v\u1ec1 k\u1ebft qu\u1ea3 t\u00e1c d\u1ee5ng c\u1ee7a l\u1ef1c<\/p><\/blockquote>\n\n\n\n L\u1ef1c \u0111\u00e0n h\u1ed3i<\/p>\n\n\n\n L\u1ef1c \u0111\u00e0n h\u1ed3i c\u1ee7a xu\u1ea5t hi\u1ec7n \u1edf hai \u0111\u1ea7u c\u1ee7a l\u00f2 xo v\u00e0 t\u00e1c d\u1ee5ng v\u00e0o c\u00e1c v\u1eadt ti\u1ebfp x\u00fac v\u1edbi l\u00f2 xo l\u00e0m n\u00f3 bi\u1ebfn d\u1ea1ng. Th\u1ef1c t\u1ebf cho th\u1ea5y, khi ch\u00fang ta d\u00f9ng tay \u1ea5n l\u00ean l\u00f2 xo. Tay c\u1ee7a ch\u00fang ta c\u0169ng b\u1ecb l\u00f2 xo t\u00e1c d\u1ee5ng l\u1ea1i m\u1ed9t l\u1ef1c. \u0110\u00e2y ch\u00ednh l\u00e0 l\u1ef1c \u0111\u00e0n h\u1ed3i. Tuy nhi\u00ean trong nhi\u1ec1u tr\u01b0\u1eddng h\u1ee3p, khi ch\u00fang ta t\u00e1c d\u1ee5ng m\u1ed9t l\u1ef1c qu\u00e1 m\u1ea1nh l\u00ean hai \u0111\u1ea7u c\u1ee7a l\u00f2 xo th\u00ec c\u00f3 th\u1ec3 l\u00e0m n\u00f3 bi\u1ebfn d\u1ea1ng. Kh\u00f4ng th\u1ec3 quay v\u1ec1 h\u00ecnh d\u00e1ng ban \u0111\u1ea7u. \u0110\u00e2y l\u00e0 tr\u01b0\u1eddng h\u1ee3p, l\u00f2 xo \u0111\u00e3 v\u01b0\u1ee3t qu\u00e1 gi\u1edbi h\u1ea1n \u0111\u00e0n h\u1ed3i.<\/p>\n\n\n\n C\u00e1c ki\u1ec3u l\u00f2 xo trong cu\u1ed9c s\u1ed1ng<\/p>\n\n\n\n \u0110\u1ecbnh lu\u1eadt h\u00fac li\u00ean quan \u0111\u1ebfn l\u1ef1c \u0111\u00e0n h\u1ed3i v\u00e0 h\u00ecnh d\u1ea1ng c\u1ee7a l\u00f2 xo. \u0110\u00f3 l\u00e0 l\u00fd do ch\u00fang ta c\u1ea7n ph\u1ea3i t\u00ecm hi\u1ec3u v\u1ec1 l\u1ef1c \u0111\u00e0n h\u1ed3i tr\u01b0\u1edbc khi \u0111\u1ebfn v\u1edbi \u0111\u1ecbnh lu\u1eadt n\u00e0y. \u0110\u1ecbnh lu\u1eadt h\u00fac \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng nhi\u1ec1u trong c\u00e1c b\u00e0i t\u1eadp t\u00ednh to\u00e1n tr\u00ean l\u1edbp c\u1ee7a c\u00e1c em. Ngo\u00e0i ra, trong c\u00e1c th\u00ed nghi\u1ec7m th\u1ef1c t\u1ebf, c\u00e1c nh\u00e0 khoa h\u1ecdc c\u0169ng s\u1eed d\u1ee5ng \u0111\u1ecbnh lu\u1eadt n\u00e0y r\u1ea5t nhi\u1ec1u. C\u00e1c em n\u00ean n\u1eafm v\u1eefng ki\u1ebfn th\u1ee9c v\u1ec1 l\u1ef1c \u0111\u00e0n h\u1ed3i c\u1ee7a l\u00f2 xo \u0111\u1ec3 c\u00f3 th\u1ec3 hi\u1ec3u \u0111\u1ecbnh lu\u1eadt n\u00e0y d\u1ec5 d\u00e0ng nh\u1ea5t.<\/p>\n\n\n\n H\u01b0\u1edbng v\u00e0 \u0111i\u1ec3m \u0111\u1eb7t c\u1ee7a l\u1ef1c \u0111\u00e0n h\u1ed3i<\/p>\n\n\n\n Ch\u1eafc h\u1eb3n, c\u00e1c em s\u1ebd c\u00f3 nhi\u1ec1u b\u00e0i t\u1eadp li\u00ean quan \u0111\u1ebfn x\u00e1c \u0111\u1ecbnh l\u1ef1c. V\u1eady l\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c l\u1ef1c \u0111\u00e0n h\u1ed3i. H\u01b0\u1edbng v\u00e0 \u0111i\u1ec3m \u0111\u1eb7t c\u1ee7a l\u1ef1c \u0111\u00e0n h\u1ed3i l\u00e0 nh\u1eefng th\u1ee9 m\u00e0 c\u00e1c em c\u1ea7n x\u00e1c \u0111\u1ecbnh \u0111\u1ea7u ti\u00ean. H\u01b0\u1edbng c\u1ee7a l\u1ef1c \u0111\u00e0n h\u1ed3i \u1edf m\u1ed7i \u0111\u1ea7u l\u00f2 xo s\u1ebd ng\u01b0\u1ee3c h\u01b0\u1edbng v\u1edbi ngo\u1ea1i l\u1ef1c g\u00e2y bi\u1ebfn d\u1ea1ng. Khi ch\u00fang ta t\u00e1c d\u1ee5ng l\u1ef1c \u1ea5n l\u00ean hai \u0111\u1ea7u l\u00f2 xo. Th\u00ec h\u01b0\u1edbng c\u1ee7a l\u1ef1c \u0111\u00e0n h\u1ed3i s\u1ebd h\u01b0\u1edbng ng\u01b0\u1ee3c l\u1ea1i v\u1edbi l\u1ef1c \u1ea5n c\u1ee7a ch\u00fang ta. Khi ch\u00fang ta t\u00e1c d\u1ee5ng l\u1ef1c k\u00e9o gi\u00e3n hai \u0111\u1ea7u l\u00f2 xo, th\u00ec h\u01b0\u1edbng c\u1ee7a l\u1ef1c \u0111\u00e0n h\u1ed3i s\u1ebd \u0111i ng\u01b0\u1ee3c v\u00e0o th\u00e2n l\u00f2 xo.<\/p>\n\n\n\n H\u01b0\u1edbng c\u1ee7a l\u1ef1c \u0111\u00e0n h\u1ed3i s\u1ebd ng\u01b0\u1ee3c v\u1edbi h\u01b0\u1edbng c\u1ee7a ngo\u1ea1i l\u1ef1c t\u00e1c d\u1ee5ng. \u0110i\u1ec1u n\u00e0y v\u00f4 c\u00f9ng d\u1ec5 hi\u1ec3u. C\u00e1c em ho\u00e0n to\u00e0n c\u00f3 th\u1ec3 l\u00e0m th\u00ed nghi\u1ec7m \u0111\u1ec3 c\u1ea3m nh\u1eadn l\u1ef1c \u0111\u00e0n h\u1ed3i c\u1ee7a l\u00f2 xo t\u00e1c d\u1ee5ng ng\u01b0\u1ee3c l\u1ea1i l\u00ean tay m\u00ecnh. \u0110i\u1ec3m \u0111\u1eb7t c\u1ee7a l\u1ef1c \u0111\u00e0n h\u1ed3i, ch\u00ednh l\u00e0 v\u1ecb tr\u00ed ch\u00fang ta t\u00e1c d\u1ee5ng l\u1ef1c l\u00ean l\u00f2 xo. Ho\u1eb7c khi c\u00f3 v\u1eadt kh\u00e1c t\u00e1c d\u1ee5ng l\u1ef1c l\u00ean \u0111\u1ea7u c\u1ee7a l\u00f2 xo th\u00ec v\u1ecb tr\u00ed t\u00e1c d\u1ee5ng l\u1ef1c c\u0169ng ch\u00ednh l\u00e0 v\u1ecb tr\u00ed \u0111i\u1ec3m \u0111\u1eb7t. \u0110\u1ecbnh lu\u1eadt H\u00fac c\u0169ng li\u00ean quan r\u1ea5t nhi\u1ec1u \u0111\u1ebfn \u0111i\u1ec1u n\u00e0y. C\u00e1c em n\u00ean ghi ch\u00e9p v\u00e0 nh\u1edb nh\u1eefng v\u00ed d\u1ee5 \u0111\u1ec3 n\u1eafm b\u1eaft b\u00e0i h\u1ecdc d\u1ec5 d\u00e0ng h\u01a1n.<\/p>\n\n\n\n Gi\u1edbi h\u1ea1n l\u1ef1c \u0111\u00e0n h\u1ed3i c\u1ee7a l\u00f2 xo<\/p>\n\n\n\n Nh\u01b0 ch\u00fang ta \u0111\u00e3 \u0111\u1ec1 c\u1eadp \u0111\u1ebfn ph\u00eda tr\u00ean, trong m\u1ed9t s\u1ed1 tr\u01b0\u1eddng h\u1ee3p, khi l\u1ef1c t\u00e1c d\u1ee5ng qu\u00e1 m\u1ea1nh. L\u00f2 xo sau khi b\u1ecb t\u00e1c d\u1ee5ng l\u1ef1c c\u00f3 th\u1ec3 b\u1ecb bi\u1ebfn d\u1ea1ng kh\u00f4ng tr\u1edf v\u1ec1 h\u00ecnh d\u1ea1ng c\u0169. \u0110\u00e2y ch\u00ednh l\u00e0 tr\u01b0\u1eddng h\u1ee3p l\u1ef1c t\u00e1c d\u1ee5ng \u0111\u00e3 \u0111\u1ea1t qu\u00e1 gi\u1edbi h\u1ea1n l\u1ef1c \u0111\u00e0n h\u1ed3i c\u1ee7a l\u00f2 xo. Trong tr\u01b0\u1eddng h\u1ee3p n\u00e0y, \u0111\u1ecbnh lu\u1eadt H\u00fac c\u0169ng kh\u00f4ng th\u1ec3 \u00e1p d\u1ee5ng \u0111\u1ec3 t\u00ednh to\u00e1n \u0111\u1ed9 l\u1edbn c\u1ee7a ngo\u1ea1i l\u1ef1c.<\/p>\n\n\n\n L\u00f2 xo khi ch\u01b0a b\u1ecb bi\u1ebfn d\u1ea1ng<\/p>\n\n\n\n M\u1ed7i chi\u1ebfc l\u00f2 xo \u0111\u1ec1u c\u00f3 gi\u1edbi h\u1ea1n l\u1ef1c \u0111\u00e0n h\u1ed3i nh\u1ea5t \u0111\u1ecbnh. C\u00f3 nh\u1eefng chi\u1ebfc l\u00f2 xo c\u00f3 gi\u1edbi h\u1ea1n l\u1ef1c \u0111\u00e0n h\u1ed3i l\u1edbn. C\u00f3 chi\u1ebfc l\u00f2 xo l\u1ea1i c\u00f3 gi\u1edbi h\u1ea1n l\u1ef1c \u0111\u00e0n h\u1ed3i nh\u1ecf h\u01a1n. N\u1ebfu tr\u1ecdng l\u01b0\u1ee3ng c\u1ee7a t\u1ea3i \u0111\u1ea1t qu\u00e1 gi\u1edbi h\u1ea1n c\u1ee7a l\u1ef1c \u0111\u00e0n h\u1ed3i lo xo, th\u00ec l\u00f2 xo s\u1ebd b\u1ecb bi\u1ebfn d\u1ea1ng kh\u00f4ng th\u1ec3 tr\u1edf v\u1ec1 h\u00ecnh d\u1ea1ng ban \u0111\u1ea7u.<\/p>\n\n\n\n C\u00e1c em c\u00f3 th\u1ec3 t\u1ef1 th\u1ef1c hi\u1ec7n \u0111i\u1ec1u n\u00e0y \u0111\u1ec3 th\u1eed nghi\u1ec7m. Nh\u1eefng chi\u1ebfc l\u00f2 xo nh\u1ecf c\u00f3 l\u1ef1c \u0111\u00e0n h\u1ed3i b\u00e9 c\u00e1c em ho\u00e0n to\u00e0n c\u00f3 th\u1ec3 d\u00f9ng tay k\u00e9o d\u00e3n ra. Nh\u01b0 v\u1eady khi chi\u1ebfc l\u00f2 xo b\u1ecb bi\u1ebfn d\u1ea1ng, kh\u00f4ng tr\u1edf v\u1ec1 h\u00ecnh d\u1ea1ng ban \u0111\u1ea7u. Ngh\u0129a l\u00e0 \u0111\u00e3 v\u01b0\u1ee3t qu\u00e1 gi\u1edbi h\u1ea1n \u0111\u00e0n h\u1ed3i c\u1ee7a chi\u1ebfc l\u00f2 xo \u0111\u00f3.<\/p>\n\n\n\n T\u00ecm hi\u1ec3u th\u00eam v\u1ec1 L\u1ef1c k\u1ebf ph\u00e9p \u0111o l\u1ef1c tr\u1ecdng l\u01b0\u1ee3ng v\u00e0 kh\u1ed1i l\u01b0\u1ee3ng \u2013 V\u1eadt l\u00fd 6<\/p><\/blockquote>\n\n\n\n \u0110\u1ecbnh lu\u1eadt H\u00fac l\u00e0 g\u00ec?<\/p>\n\n\n\n Sau khi ch\u00fang ta \u0111\u00e3 t\u00ecm hi\u1ec3u v\u1ec1 l\u1ef1c \u0111\u00e0n h\u1ed3i v\u00e0 nh\u1eefng \u0111i\u1ec1u li\u00ean quan \u0111\u1ebfn l\u00f2 xo, ch\u00fang ta s\u1ebd \u0111\u1ebfn v\u1edbi \u0111\u1ecbnh lu\u1eadt H\u00fac. N\u1ed9i dung c\u1ee7a \u0111\u1ecbnh lu\u1eadt n\u00e0y ch\u00ednh l\u00e0: trong gi\u1edbi h\u1ea1n \u0111\u00e0n h\u1ed3i, \u0111\u1ed9 l\u1edbn c\u1ee7a l\u1ef1c \u0111\u00e0n h\u1ed3i t\u1ec9 l\u1ec7 thu\u1eadn v\u1edbi \u0111\u1ed9 bi\u1ebfn d\u1ea1ng c\u1ee7a l\u00f2 xo. \u0110\u1ed9 bi\u1ebfn d\u1ea1ng \u1edf \u0111\u00e2y c\u00f3 th\u1ec3 \u00e1p d\u1ee5ng trong vi\u1ec7c n\u00e9n ho\u1eb7c k\u00e9o gi\u00e3n l\u00f2 xo. \u0110\u1ecbnh lu\u1eadt n\u00e0y c\u00f2n \u0111\u01b0\u1ee3c t\u00f3m t\u1eaft b\u1eb1ng c\u00f4ng th\u1ee9c \u0111\u00e3 c\u00f3 trong s\u00e1ch gi\u00e1o khoa c\u1ee7a c\u00e1c em.<\/p>\n\n\n\n L\u00f2 xo v\u00e0 \u0111\u1ecbnh lu\u1eadt H\u00fac<\/p>\n\n\n\n L\u1ecbch s\u1eed c\u1ee7a \u0111\u1ecbnh lu\u1eadt H\u00fac<\/p>\n\n\n\n \u0110\u1ecbnh lu\u1eadt H\u00fac hay c\u00f2n \u0111\u01b0\u1ee3c bi\u1ebft \u0111\u1ebfn v\u1edbi t\u00ean g\u1ecdi \u0111\u1ecbnh lu\u1eadt Hooke. \u0110\u1ecbnh lu\u1eadt n\u00e0y \u0111\u01b0\u1ee3c \u0111\u1eb7t theo t\u00ean c\u1ee7a nh\u00e0 v\u1eadt l\u00fd ng\u01b0\u1eddi Anh Robert Hooke. \u00d4ng l\u00e0 ng\u01b0\u1eddi t\u00ecm ra v\u00e0 tuy\u00ean b\u1ed1 \u0111\u1ecbnh lu\u1eadt l\u1ea7n \u0111\u1ea7u ti\u00ean v\u00e0o n\u0103m 1676 (th\u1ebf k\u1ef7 17). \u00d4ng lu\u00f4n cho r\u1eb1ng \u0111a s\u1ed1 l\u00f2 xo tu\u00e2n theo li\u00ean h\u1ec7 tuy\u1ebfn t\u00ednh gi\u1eefa l\u1ef1c \u0111\u00e0n h\u1ed3i v\u00e0 \u0111\u1ed9 bi\u1ebfn d\u1ea1ng. \u00d4ng \u0111\u00e3 nghi\u00ean c\u1ee9u v\u00e0 ch\u1ee9ng minh \u0111\u1ecbnh lu\u1eadt c\u1ee7a m\u00ecnh l\u00e0 ch\u00ednh x\u00e1c. Cho \u0111\u1ebfn nay, \u0111\u1ecbnh lu\u1eadt n\u00e0y v\u1eabn \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng nhi\u1ec1u trong c\u00e1c th\u00ed nghi\u1ec7m v\u00e0 cu\u1ed9c s\u1ed1ng h\u00e0ng ng\u00e0y.<\/p>\n\n\n\n \u1ee8ng d\u1ee5ng c\u1ee7a \u0111\u1ecbnh lu\u1eadt H\u00fac?<\/p>\n\n\n\n \u1ee8ng d\u1ee5ng c\u1ee7a \u0111\u1ecbnh lu\u1eadt H\u00fac \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng r\u1ea5t nhi\u1ec1u trong cu\u1ed9c s\u1ed1ng h\u1eb1ng ng\u00e0y. C\u00e1c em c\u00f3 th\u1ec3 kh\u00f4ng bi\u1ebft \u0111\u1ebfn. Tuy nhi\u00ean, trong nh\u1eefng \u0111\u1ed3 d\u00f9ng h\u1eb1ng ng\u00e0y trong nh\u00e0 c\u1ee7a ch\u00fang ta c\u0169ng \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng \u0111i\u1ec1u n\u00e0y. Gh\u1ebf sofa hay \u0111\u1ec7m l\u00f2 xo \u0111\u1ec1u \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng l\u1ef1c \u0111\u00e0n h\u1ed3i v\u00e0 \u0111\u1ecbnh lu\u1eadt n\u00e0y. Khi ch\u00fang ta ng\u1ed3i l\u00ean ho\u1eb7c n\u1eb1m l\u00ean c\u00e1c v\u1eadt n\u00e0y. Sau khi \u0111\u1ee9ng d\u1eady, v\u1eadt s\u1ebd tr\u1edf l\u1ea1i h\u00ecnh d\u00e1ng ban \u0111\u1ea7u. C\u00e1c nh\u00e0 thi\u1ebft k\u1ebf<\/a> \u0111\u00e3 ph\u1ea3i t\u00ednh to\u00e1n \u0111\u1ed9 n\u1eb7ng \u0111\u1ec3 c\u00f3 th\u1ec3 l\u1eafp gh\u00e9p l\u00f2 xo ph\u00f9 h\u1ee3p v\u1edbi nh\u1eefng v\u1eadt n\u00e0y.<\/p>\n\n\n\n Th\u00ed nghi\u1ec7m v\u1ec1 \u0111\u1ed9 co gi\u00e3n c\u1ee7a l\u00f2 xo<\/p>\n\n\n\n Ngo\u00e0i ra, trong c\u00f4ng nghi\u1ec7p, \u0111\u1ecbnh lu\u1eadt H\u00fac c\u0169ng \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng. v\u00ed d\u1ee5 nh\u01b0 h\u00e0ng r\u00e0o B40, k\u00ecm t\u1ec9a c\u00e0nh, cung t\u00ean,\u2026. \u0111\u1ec1u l\u00e0 nh\u1eefng k\u1ebft qu\u1ea3 c\u1ee7a vi\u1ec7c \u00e1p d\u1ee5ng \u0111\u1ecbnh lu\u1eadt n\u00e0y. Hi\u1ec3u v\u00e0 nh\u1edb v\u1ec1 \u0111\u1ecbnh lu\u1eadt Hooke c\u00e1c em s\u1ebd d\u1ec5 d\u00e0ng ti\u1ebfp c\u1eadn v\u1edbi nh\u1eefng \u0111i\u1ec1u trong cu\u1ed9c s\u1ed1ng. V\u1eadt l\u00fd th\u01b0\u1eddng \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng r\u1ea5t nhi\u1ec1u. C\u00e1c em ch\u1ec9 c\u1ea7n \u0111\u1ec3 \u00fd v\u00e0 v\u1eadn d\u1ee5ng ki\u1ebfn th\u1ee9c c\u1ee7a m\u00ecnh v\u00e0o th\u1ef1c t\u1ebf, c\u00e1c em s\u1ebd nh\u1eadn ra \u0111\u01b0\u1ee3c nh\u1eefng \u0111i\u1ec1u n\u00e0y.<\/p>\n\n\n\n \u1ee8ng d\u1ee5ng th\u1ef1c t\u1ebf<\/p>\n\n\n\n V\u1eadt l\u00fd l\u00e0 m\u1ed9t m\u00f4n h\u1ecdc g\u1eafn li\u1ec1n v\u1edbi th\u1ef1c t\u1ebf. Nh\u1eefng b\u00e0i h\u1ecdc c\u00e1c em \u0111\u01b0\u1ee3c gi\u1ea3ng d\u1ea1y \u0111\u1ec1u c\u00f3 th\u1ec3 \u00e1p d\u1ee5ng ho\u1eb7c gi\u1ea3i th\u00edch hi\u1ec7n t\u01b0\u1ee3ng trong cu\u1ed9c s\u1ed1ng. Khi k\u1ebft n\u1ed1i \u0111\u01b0\u1ee3c ki\u1ebfn th\u1ee9c v\u00e0o th\u1ef1c t\u1ebf c\u00e1c em s\u1ebd th\u1ea5y nh\u1eefng b\u00e0i h\u1ecdc tr\u1edf n\u00ean th\u00fa v\u1ecb h\u01a1n. Nh\u1eefng b\u00e0i t\u1eadp tr\u00ean l\u1edbp s\u1ebd kh\u00f4ng h\u1ec1 kh\u00f4 khan m\u00e0 gi\u1ed1ng nh\u01b0 nh\u1eefng b\u00e0i h\u1ecdc m\u1edbi m\u1ebb v\u1ec1 cu\u1ed9c s\u1ed1ng d\u00e0nh cho c\u00e1c em. H\u00e3y li\u00ean k\u1ebft nh\u1eefng ki\u1ebfn th\u1ee9c \u0111\u01b0\u1ee3c h\u1ecdc v\u00e0o th\u1ef1c t\u1ebf \u0111\u1ec3 d\u1ec5 d\u00e0ng ti\u1ebfp c\u1eadn h\u01a1n nh\u00e9!<\/p>\n\n\n\n C\u00f3 th\u1ec3 n\u00f3i, \u0111\u1ecbnh lu\u1eadt H\u00fac v\u00e0 s\u1ef1 \u0111\u00e0n h\u1ed3i c\u1ee7a l\u00f2 xo \u0111\u00e3 \u0111\u01b0\u1ee3c ch\u00fang t\u00f4i gi\u1ea3i \u0111\u00e1p v\u00e0 \u0111\u1ec1 c\u1eadp \u0111\u1ebfn trong b\u00e0i vi\u1ebft n\u00e0y. H\u01a1n c\u1ea3, m\u1ed7i \u0111\u1ecbnh ngh\u0129a v\u1ec1 l\u00fd thuy\u1ebft \u0111\u1ec1u \u0111\u01b0\u1ee3c ch\u00fang t\u00f4i l\u1ea5y v\u00ed d\u1ee5 \u0111\u01a1n gi\u1ea3n, g\u1ea7n g\u0169i. Hy v\u1ecdng nh\u1eefng \u0111i\u1ec1u n\u00e0y c\u00f3 th\u1ec3 gi\u00fap \u00edch cho c\u00e1c em nhi\u1ec1u h\u01a1n trong vi\u1ec7c h\u1ecdc t\u1eadp<\/a>. C\u1ea3m \u01a1n c\u00e1c em \u0111\u00e3 \u0111\u00f3n \u0111\u1ecdc b\u00e0i vi\u1ebft n\u00e0y.<\/p>\n\n\n\n C\u00f2n r\u1ea5t nhi\u1ec1u ki\u1ebfn th\u1ee9c m\u1edbi v\u1ec1 v\u1eadt l\u00fd l\u1edbp 6 \u0111ang \u0111\u01b0\u1ee3c \u0111\u0103ng t\u1ea3i tr\u00ean trang ch\u1ee7. C\u00e1c em h\u00e3y truy c\u1eadp t\u1ea1i \u0111\u00e2y v\u00e0 \u0111\u1ecdc tham kh\u1ea3o nh\u00e9!<\/p>\n\n\n\n Xem th\u00eam c\u00e1c b\u00e0i vi\u1ebft c\u00f3 c\u00f9ng ch\u1ee7 \u0111\u1ec1<\/p><\/blockquote>\n\n\n\n \u0110\u1ecbnh lu\u1eadt b\u1ea3o to\u00e0n kh\u1ed1i l\u01b0\u1ee3ng l\u1edbp 8 \u2013 D\u1ea1ng b\u00e0i t\u1eadp hay g\u1eb7p<\/p>\n\n\n\n \u0110\u1ecbnh lu\u1eadt ph\u1ea3n x\u1ea1 \u00e1nh s\u00e1ng l\u00e0 g\u00ec b\u1ea1n c\u00f3<\/p>\n\n\n\n\n\n\n","protected":false},"excerpt":{"rendered":" Ghi ch\u00fa: T\u00e0i li\u1ec7u tr\u00edch d\u1eabn Trong ch\u01b0\u01a1ng tr\u00ecnh v\u1eadt l\u00fd l\u1edbp 6, c\u00e1c em s\u1ebd \u0111\u01b0\u1ee3c ti\u1ebfp c\u1eadn v\u1edbi m\u1ed9t ki\u1ebfn th\u1ee9c m\u1edbi v\u1ec1 l\u1ef1c. \u0110\u1ecbnh lu\u1eadt H\u00fac \u0111\u01b0\u1ee3c bi\u1ebft \u0111\u1ebfn l\u00e0 m\u1ed9t trong nh\u1eefng ki\u1ebfn th\u1ee9c ti\u00eau bi\u1ec3u v\u1ec1 l\u1ef1c t\u00e1c d\u1ee5ng. Bi\u1ebft \u0111\u1ebfn \u0111\u1ecbnh lu\u1eadt n\u00e0y, c\u00e1c em c\u00f3 th\u1ec3 \u00e1p d\u1ee5ng […]<\/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":[4,7],"tags":[],"class_list":["post-1143","post","type-post","status-publish","format-standard","hentry","category-trung-hoc","category-vat-ly"],"_links":{"self":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/1143","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=1143"}],"version-history":[{"count":0,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/posts\/1143\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/media?parent=1143"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/categories?post=1143"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.vietlearn.org\/kien-thuc\/wp-json\/wp\/v2\/tags?post=1143"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}