{"id":570850,"date":"2026-07-27T15:01:26","date_gmt":"2026-07-27T08:01:26","guid":{"rendered":"https:\/\/hoanghamobile.com\/tin-tuc\/?p=570850"},"modified":"2026-07-27T15:01:26","modified_gmt":"2026-07-27T08:01:26","slug":"con-lac-don-la-gi","status":"publish","type":"post","link":"https:\/\/hoanghamobile.com\/tin-tuc\/con-lac-don-la-gi\/","title":{"rendered":"Con l\u1eafc \u0111\u01a1n l\u00e0 g\u00ec? C\u00f4ng th\u1ee9c chu k\u1ef3 T = 2\u03c0\u221a(l\/g) v\u00e0 b\u00e0i t\u1eadp"},"content":{"rendered":"<p><strong>Con l\u1eafc \u0111\u01a1n g\u1ed3m m\u1ed9t v\u1eadt nh\u1ecf kh\u1ed1i l\u01b0\u1ee3ng m treo v\u00e0o \u0111\u1ea7u m\u1ed9t s\u1ee3i d\u00e2y kh\u00f4ng d\u00e3n, kh\u1ed1i l\u01b0\u1ee3ng kh\u00f4ng \u0111\u00e1ng k\u1ec3, c\u00f3 chi\u1ec1u d\u00e0i l; khi dao \u0111\u1ed9ng v\u1edbi bi\u00ean \u0111\u1ed9 g\u00f3c nh\u1ecf, con l\u1eafc \u0111\u01a1n dao \u0111\u1ed9ng \u0111i\u1ec1u h\u00f2a v\u1edbi chu k\u1ef3 T = 2\u03c0\u221a(l\/g).<\/strong> \u0110\u00e2y l\u00e0 m\u1ed9t trong nh\u1eefng m\u00f4 h\u00ecnh quen thu\u1ed9c v\u00e0 quan tr\u1ecdng nh\u1ea5t c\u1ee7a ph\u1ea7n dao \u0111\u1ed9ng c\u01a1 trong ch\u01b0\u01a1ng tr\u00ecnh V\u1eadt l\u00fd l\u1edbp 12. N\u1eafm v\u1eefng b\u1ea3n ch\u1ea5t con l\u1eafc \u0111\u01a1n kh\u00f4ng ch\u1ec9 gi\u00fap b\u1ea1n tr\u1ea3 l\u1eddi nhanh c\u00e1c c\u00e2u l\u00fd thuy\u1ebft m\u00e0 c\u00f2n x\u1eed l\u00fd g\u1ecdn nhi\u1ec1u d\u1ea1ng b\u00e0i t\u1eadp t\u00ednh chu k\u1ef3, t\u1ea7n s\u1ed1 v\u00e0 c\u1ea3 b\u00e0i th\u1ef1c h\u00e0nh \u0111o gia t\u1ed1c tr\u1ecdng tr\u01b0\u1eddng. N\u1ed9i dung d\u01b0\u1edbi \u0111\u00e2y s\u1ebd \u0111i t\u1eeb kh\u00e1i ni\u1ec7m, \u0111i\u1ec1u ki\u1ec7n dao \u0111\u1ed9ng \u0111i\u1ec1u h\u00f2a, c\u00f4ng th\u1ee9c chu k\u1ef3 \u2013 t\u1ea7n s\u1ed1, n\u0103ng l\u01b0\u1ee3ng dao \u0111\u1ed9ng cho t\u1edbi c\u00e1c v\u00ed d\u1ee5 c\u00f3 l\u1eddi gi\u1ea3i chi ti\u1ebft.<\/p>\n<h2>Con l\u1eafc \u0111\u01a1n l\u00e0 g\u00ec?<\/h2>\n<p>Con l\u1eafc \u0111\u01a1n l\u00e0 h\u1ec7 g\u1ed3m m\u1ed9t v\u1eadt nh\u1ecf (coi nh\u01b0 ch\u1ea5t \u0111i\u1ec3m) kh\u1ed1i l\u01b0\u1ee3ng m, treo v\u00e0o \u0111\u1ea7u m\u1ed9t s\u1ee3i d\u00e2y kh\u00f4ng d\u00e3n c\u00f3 chi\u1ec1u d\u00e0i l v\u00e0 kh\u1ed1i l\u01b0\u1ee3ng kh\u00f4ng \u0111\u00e1ng k\u1ec3; \u0111\u1ea7u c\u00f2n l\u1ea1i c\u1ee7a d\u00e2y \u0111\u01b0\u1ee3c treo c\u1ed1 \u0111\u1ecbnh. Khi k\u00e9o v\u1eadt l\u1ec7ch kh\u1ecfi v\u1ecb tr\u00ed c\u00e2n b\u1eb1ng r\u1ed3i th\u1ea3 ra, con l\u1eafc s\u1ebd dao \u0111\u1ed9ng qua l\u1ea1i quanh v\u1ecb tr\u00ed c\u00e2n b\u1eb1ng d\u01b0\u1edbi t\u00e1c d\u1ee5ng c\u1ee7a tr\u1ecdng l\u1ef1c v\u00e0 l\u1ef1c c\u0103ng d\u00e2y.<\/p>\n<p>\u1ede v\u1ecb tr\u00ed c\u00e2n b\u1eb1ng, d\u00e2y treo c\u00f3 ph\u01b0\u01a1ng th\u1eb3ng \u0111\u1ee9ng. Khi v\u1eadt l\u1ec7ch m\u1ed9t g\u00f3c \u03b1 so v\u1edbi ph\u01b0\u01a1ng n\u00e0y, th\u00e0nh ph\u1ea7n tr\u1ecdng l\u1ef1c theo ph\u01b0\u01a1ng chuy\u1ec3n \u0111\u1ed9ng \u0111\u00f3ng vai tr\u00f2 l\u1ef1c k\u00e9o v\u1ec1, lu\u00f4n h\u01b0\u1edbng v\u1eadt tr\u1edf l\u1ea1i v\u1ecb tr\u00ed c\u00e2n b\u1eb1ng. Ch\u00ednh l\u1ef1c k\u00e9o v\u1ec1 n\u00e0y t\u1ea1o n\u00ean dao \u0111\u1ed9ng c\u1ee7a con l\u1eafc.<\/p>\n<p><img fetchpriority=\"high\" decoding=\"async\" class=\"aligncenter size-full wp-image-570860\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/con-lac-don-1.jpg\" alt=\"con-lac-don-1\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/con-lac-don-1.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/con-lac-don-1-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/con-lac-don-1-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h2>\u0110i\u1ec1u ki\u1ec7n \u0111\u1ec3 con l\u1eafc \u0111\u01a1n dao \u0111\u1ed9ng \u0111i\u1ec1u h\u00f2a<\/h2>\n<p>Con l\u1eafc \u0111\u01a1n ch\u1ec9 dao \u0111\u1ed9ng \u0111i\u1ec1u h\u00f2a khi th\u1ecfa m\u00e3n \u0111\u1ed3ng th\u1eddi hai \u0111i\u1ec1u ki\u1ec7n sau:<\/p>\n<ul>\n<li><strong>Bi\u00ean \u0111\u1ed9 g\u00f3c nh\u1ecf:<\/strong> g\u00f3c l\u1ec7ch c\u1ef1c \u0111\u1ea1i th\u01b0\u1eddng l\u1ea5y nh\u1ecf h\u01a1n kho\u1ea3ng 10\u00b0 \u0111\u1ec3 c\u00f3 th\u1ec3 x\u1ea5p x\u1ec9 sin \u03b1 \u2248 \u03b1 (\u0111\u01a1n v\u1ecb radian).<\/li>\n<li><strong>B\u1ecf qua ma s\u00e1t v\u00e0 l\u1ef1c c\u1ea3n:<\/strong> l\u1ef1c c\u1ea3n c\u1ee7a kh\u00f4ng kh\u00ed v\u00e0 ma s\u00e1t t\u1ea1i \u0111i\u1ec3m treo \u0111\u01b0\u1ee3c coi l\u00e0 kh\u00f4ng \u0111\u00e1ng k\u1ec3.<\/li>\n<\/ul>\n<p>Khi bi\u00ean \u0111\u1ed9 g\u00f3c l\u1edbn, dao \u0111\u1ed9ng c\u1ee7a con l\u1eafc kh\u00f4ng c\u00f2n l\u00e0 dao \u0111\u1ed9ng \u0111i\u1ec1u h\u00f2a v\u00e0 c\u00f4ng th\u1ee9c chu k\u1ef3 quen thu\u1ed9c s\u1ebd kh\u00f4ng c\u00f2n ch\u00ednh x\u00e1c. N\u1ebfu b\u1ea1n mu\u1ed1n hi\u1ec3u s\u00e2u h\u01a1n v\u1ec1 b\u1ea3n ch\u1ea5t c\u1ee7a lo\u1ea1i dao \u0111\u1ed9ng n\u00e0y, c\u00f3 th\u1ec3 tham kh\u1ea3o b\u00e0i <a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/dao-dong-dieu-hoa-la-gi\/\">dao \u0111\u1ed9ng \u0111i\u1ec1u h\u00f2a l\u00e0 g\u00ec<\/a> \u0111\u1ec3 n\u1eafm ph\u01b0\u01a1ng tr\u00ecnh li \u0111\u1ed9 t\u1ed5ng qu\u00e1t x = A\u00b7cos(\u03c9t + \u03c6).<\/p>\n<p><img decoding=\"async\" class=\"aligncenter size-full wp-image-570861\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/con-lac-don-3.jpg\" alt=\"con-lac-don-3\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/con-lac-don-3.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/con-lac-don-3-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/con-lac-don-3-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h2>C\u00f4ng th\u1ee9c chu k\u1ef3 v\u00e0 t\u1ea7n s\u1ed1 con l\u1eafc \u0111\u01a1n<\/h2>\n<p>V\u1edbi bi\u00ean \u0111\u1ed9 g\u00f3c nh\u1ecf, chu k\u1ef3 dao \u0111\u1ed9ng c\u1ee7a con l\u1eafc \u0111\u01a1n \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh b\u1eb1ng c\u00f4ng th\u1ee9c c\u01a1 b\u1ea3n sau:<\/p>\n<p><strong>T = 2\u03c0 \u221a(l \/ g)<\/strong><\/p>\n<p>T\u1eeb chu k\u1ef3, ta suy ra ngay t\u1ea7n s\u1ed1 dao \u0111\u1ed9ng f = 1\/T v\u00e0 t\u1ea7n s\u1ed1 g\u00f3c \u03c9 = \u221a(g\/l) = 2\u03c0\/T = 2\u03c0f. B\u1ea3ng d\u01b0\u1edbi \u0111\u00e2y t\u1ed5ng h\u1ee3p c\u00e1c \u0111\u1ea1i l\u01b0\u1ee3ng v\u00e0 \u0111\u01a1n v\u1ecb c\u1ea7n nh\u1edb:<\/p>\n<table>\n<thead>\n<tr>\n<th>\u0110\u1ea1i l\u01b0\u1ee3ng<\/th>\n<th>K\u00fd hi\u1ec7u<\/th>\n<th>C\u00f4ng th\u1ee9c<\/th>\n<th>\u0110\u01a1n v\u1ecb<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Chu k\u1ef3<\/td>\n<td>T<\/td>\n<td>T = 2\u03c0\u221a(l\/g)<\/td>\n<td>gi\u00e2y (s)<\/td>\n<\/tr>\n<tr>\n<td>T\u1ea7n s\u1ed1<\/td>\n<td>f<\/td>\n<td>f = 1\/T<\/td>\n<td>h\u00e9c (Hz)<\/td>\n<\/tr>\n<tr>\n<td>T\u1ea7n s\u1ed1 g\u00f3c<\/td>\n<td>\u03c9<\/td>\n<td>\u03c9 = \u221a(g\/l)<\/td>\n<td>rad\/s<\/td>\n<\/tr>\n<tr>\n<td>Chi\u1ec1u d\u00e0i d\u00e2y<\/td>\n<td>l<\/td>\n<td>\u2014<\/td>\n<td>m\u00e9t (m)<\/td>\n<\/tr>\n<tr>\n<td>Gia t\u1ed1c tr\u1ecdng tr\u01b0\u1eddng<\/td>\n<td>g<\/td>\n<td>\u2014<\/td>\n<td>m\/s\u00b2<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Trong \u0111\u00f3 g l\u00e0 <a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/gia-toc-trong-truong-la-gi\/\">gia t\u1ed1c tr\u1ecdng tr\u01b0\u1eddng<\/a> t\u1ea1i n\u01a1i \u0111\u1eb7t con l\u1eafc, th\u01b0\u1eddng l\u1ea5y x\u1ea5p x\u1ec9 9,8 m\/s\u00b2 ho\u1eb7c l\u00e0m tr\u00f2n 10 m\/s\u00b2 khi t\u00ednh to\u00e1n. \u0110\u1ea1i l\u01b0\u1ee3ng <a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/tan-so-goc-la-gi\/\">t\u1ea7n s\u1ed1 g\u00f3c \u03c9<\/a> cho bi\u1ebft t\u1ed1c \u0111\u1ed9 bi\u1ebfn thi\u00ean pha c\u1ee7a dao \u0111\u1ed9ng v\u00e0 l\u00e0 c\u1ea7u n\u1ed1i gi\u1eefa chu k\u1ef3 v\u1edbi t\u1ea7n s\u1ed1.<\/p>\n<p><img decoding=\"async\" class=\"aligncenter size-full wp-image-570862\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/con-lac-don-4.jpg\" alt=\"con-lac-don-4\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/con-lac-don-4.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/con-lac-don-4-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/con-lac-don-4-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h2>C\u00e1c y\u1ebfu t\u1ed1 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn chu k\u1ef3<\/h2>\n<p>T\u1eeb c\u00f4ng th\u1ee9c T = 2\u03c0\u221a(l\/g), ta r\u00fat ra nh\u1eefng nh\u1eadn x\u00e9t quan tr\u1ecdng v\u00e0 th\u01b0\u1eddng \u0111\u01b0\u1ee3c h\u1ecfi trong \u0111\u1ec1 thi:<\/p>\n<ul>\n<li>Chu k\u1ef3 <strong>t\u1ec9 l\u1ec7 v\u1edbi c\u0103n b\u1eadc hai c\u1ee7a chi\u1ec1u d\u00e0i d\u00e2y<\/strong>: d\u00e2y c\u00e0ng d\u00e0i, chu k\u1ef3 c\u00e0ng l\u1edbn (dao \u0111\u1ed9ng ch\u1eadm h\u01a1n).<\/li>\n<li>Chu k\u1ef3 <strong>t\u1ec9 l\u1ec7 ngh\u1ecbch v\u1edbi c\u0103n b\u1eadc hai c\u1ee7a g<\/strong>: n\u01a1i c\u00f3 g nh\u1ecf h\u01a1n th\u00ec chu k\u1ef3 l\u1edbn h\u01a1n (v\u00ed d\u1ee5 l\u00ean n\u00fai cao ho\u1eb7c l\u00ean M\u1eb7t Tr\u0103ng).<\/li>\n<li>Chu k\u1ef3 <strong>kh\u00f4ng ph\u1ee5 thu\u1ed9c v\u00e0o kh\u1ed1i l\u01b0\u1ee3ng m<\/strong> c\u1ee7a v\u1eadt n\u1eb7ng.<\/li>\n<li>V\u1edbi bi\u00ean \u0111\u1ed9 g\u00f3c nh\u1ecf, chu k\u1ef3 c\u0169ng <strong>kh\u00f4ng ph\u1ee5 thu\u1ed9c v\u00e0o bi\u00ean \u0111\u1ed9<\/strong> dao \u0111\u1ed9ng \u2014 t\u00ednh ch\u1ea5t n\u00e0y g\u1ecdi l\u00e0 s\u1ef1 \u0111\u1eb3ng th\u1eddi.<\/li>\n<\/ul>\n<h2>N\u0103ng l\u01b0\u1ee3ng dao \u0111\u1ed9ng c\u1ee7a con l\u1eafc \u0111\u01a1n<\/h2>\n<p>Trong qu\u00e1 tr\u00ecnh dao \u0111\u1ed9ng, con l\u1eafc \u0111\u01a1n li\u00ean t\u1ee5c c\u00f3 s\u1ef1 chuy\u1ec3n h\u00f3a gi\u1eefa \u0111\u1ed9ng n\u0103ng v\u00e0 th\u1ebf n\u0103ng, nh\u01b0ng n\u1ebfu b\u1ecf qua ma s\u00e1t th\u00ec c\u01a1 n\u0103ng to\u00e0n ph\u1ea7n lu\u00f4n \u0111\u01b0\u1ee3c b\u1ea3o to\u00e0n.<\/p>\n<ul>\n<li><strong>T\u1ea1i v\u1ecb tr\u00ed c\u00e2n b\u1eb1ng:<\/strong> \u0111\u1ed9ng n\u0103ng c\u1ef1c \u0111\u1ea1i, th\u1ebf n\u0103ng b\u1eb1ng 0, v\u1eadt c\u00f3 t\u1ed1c \u0111\u1ed9 l\u1edbn nh\u1ea5t.<\/li>\n<li><strong>T\u1ea1i v\u1ecb tr\u00ed bi\u00ean:<\/strong> th\u1ebf n\u0103ng c\u1ef1c \u0111\u1ea1i, \u0111\u1ed9ng n\u0103ng b\u1eb1ng 0, v\u1eadt d\u1eebng l\u1ea1i t\u1ee9c th\u1eddi r\u1ed3i \u0111\u1ed5i chi\u1ec1u.<\/li>\n<li><strong>C\u01a1 n\u0103ng:<\/strong> W = W<sub>\u0111<\/sub> + W<sub>t<\/sub> = h\u1eb1ng s\u1ed1 trong su\u1ed1t qu\u00e1 tr\u00ecnh dao \u0111\u1ed9ng (khi kh\u00f4ng c\u00f3 l\u1ef1c c\u1ea3n).<\/li>\n<\/ul>\n<p>S\u1ef1 b\u1ea3o to\u00e0n c\u01a1 n\u0103ng n\u00e0y gi\u1ea3i th\u00edch v\u00ec sao con l\u1eafc l\u00fd t\u01b0\u1edfng dao \u0111\u1ed9ng m\u00e3i m\u00e0 kh\u00f4ng d\u1eebng; trong th\u1ef1c t\u1ebf, l\u1ef1c c\u1ea3n kh\u00f4ng kh\u00ed l\u00e0m bi\u00ean \u0111\u1ed9 gi\u1ea3m d\u1ea7n n\u00ean con l\u1eafc s\u1ebd t\u1eaft d\u1ea7n theo th\u1eddi gian.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-570859\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/con-lac-don-2.jpg\" alt=\"con-lac-don-2\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/con-lac-don-2.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/con-lac-don-2-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/con-lac-don-2-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h2>\u1ee8ng d\u1ee5ng c\u1ee7a con l\u1eafc \u0111\u01a1n<\/h2>\n<p>Con l\u1eafc \u0111\u01a1n l\u00e0 m\u00f4 h\u00ecnh quan tr\u1ecdng c\u1ea3 trong h\u1ecdc t\u1eadp l\u1eabn th\u1ef1c t\u1ebf:<\/p>\n<ul>\n<li><strong>\u0110\u1ed3ng h\u1ed3 qu\u1ea3 l\u1eafc:<\/strong> nh\u1edd chu k\u1ef3 \u1ed5n \u0111\u1ecbnh, con l\u1eafc \u0111\u01b0\u1ee3c d\u00f9ng \u0111\u1ec3 gi\u1eef nh\u1ecbp th\u1eddi gian \u0111\u1ec1u \u0111\u1eb7n.<\/li>\n<li><strong>\u0110o gia t\u1ed1c tr\u1ecdng tr\u01b0\u1eddng:<\/strong> \u0111o chi\u1ec1u d\u00e0i d\u00e2y v\u00e0 chu k\u1ef3 dao \u0111\u1ed9ng r\u1ed3i suy ra g = 4\u03c0\u00b2l\/T\u00b2 \u2014 \u0111\u00e2y l\u00e0 th\u00ed nghi\u1ec7m th\u1ef1c h\u00e0nh quen thu\u1ed9c trong ch\u01b0\u01a1ng tr\u00ecnh V\u1eadt l\u00fd.<\/li>\n<li><strong>Nghi\u00ean c\u1ee9u dao \u0111\u1ed9ng:<\/strong> con l\u1eafc \u0111\u01a1n l\u00e0 v\u00ed d\u1ee5 tr\u1ef1c quan \u0111\u1ec3 minh h\u1ecda dao \u0111\u1ed9ng \u0111i\u1ec1u h\u00f2a v\u00e0 s\u1ef1 b\u1ea3o to\u00e0n n\u0103ng l\u01b0\u1ee3ng.<\/li>\n<\/ul>\n<h2>B\u00e0i t\u1eadp v\u1eadn d\u1ee5ng c\u00f3 l\u1eddi gi\u1ea3i<\/h2>\n<p><strong>B\u00e0i 1:<\/strong> Con l\u1eafc \u0111\u01a1n d\u00e0i 1 m, g = 10 m\/s\u00b2. T\u00ednh chu k\u1ef3 (l\u1ea5y \u03c0\u00b2 \u2248 10).<br \/>\n<em>L\u1eddi gi\u1ea3i:<\/em> \u00c1p d\u1ee5ng T = 2\u03c0\u221a(l\/g) = 2\u03c0\u221a(1\/10). Ta c\u00f3 \u221a(1\/10) \u2248 0,316 n\u00ean T \u2248 2 \u00d7 3,14 \u00d7 0,316 \u2248 1,99 s (x\u1ea5p x\u1ec9 2 s).<\/p>\n<p><strong>B\u00e0i 2:<\/strong> N\u1ebfu t\u0103ng chi\u1ec1u d\u00e0i d\u00e2y l\u00ean g\u1ea5p 4 l\u1ea7n th\u00ec chu k\u1ef3 thay \u0111\u1ed5i th\u1ebf n\u00e0o?<br \/>\n<em>L\u1eddi gi\u1ea3i:<\/em> V\u00ec T t\u1ec9 l\u1ec7 v\u1edbi \u221al n\u00ean khi l t\u0103ng 4 l\u1ea7n th\u00ec \u221al t\u0103ng 2 l\u1ea7n, do \u0111\u00f3 chu k\u1ef3 t\u0103ng g\u1ea5p 2 l\u1ea7n.<\/p>\n<p><strong>B\u00e0i 3:<\/strong> Thay v\u1eadt n\u1eb7ng b\u1eb1ng v\u1eadt kh\u00e1c n\u1eb7ng g\u1ea5p \u0111\u00f4i th\u00ec chu k\u1ef3 thay \u0111\u1ed5i th\u1ebf n\u00e0o?<br \/>\n<em>L\u1eddi gi\u1ea3i:<\/em> Chu k\u1ef3 kh\u00f4ng \u0111\u1ed5i, v\u00ec c\u00f4ng th\u1ee9c T = 2\u03c0\u221a(l\/g) kh\u00f4ng ch\u1ee9a kh\u1ed1i l\u01b0\u1ee3ng m.<\/p>\n<p><strong>B\u00e0i 4:<\/strong> Con l\u1eafc \u0111\u01a1n d\u00e0i 0,4 m dao \u0111\u1ed9ng v\u1edbi chu k\u1ef3 1,26 s. T\u00ednh g.<br \/>\n<em>L\u1eddi gi\u1ea3i:<\/em> T\u1eeb T = 2\u03c0\u221a(l\/g) suy ra g = 4\u03c0\u00b2l\/T\u00b2 = 4 \u00d7 9,87 \u00d7 0,4 \/ (1,26)\u00b2 = 15,79 \/ 1,588 \u2248 9,94 m\/s\u00b2.<\/p>\n<p><strong>B\u00e0i 5 (tr\u1eafc nghi\u1ec7m):<\/strong> Chu k\u1ef3 con l\u1eafc \u0111\u01a1n dao \u0111\u1ed9ng nh\u1ecf ph\u1ee5 thu\u1ed9c v\u00e0o y\u1ebfu t\u1ed1 n\u00e0o? A. Kh\u1ed1i l\u01b0\u1ee3ng v\u1eadt; B. Bi\u00ean \u0111\u1ed9 l\u1edbn; C. Chi\u1ec1u d\u00e0i d\u00e2y v\u00e0 g; D. M\u00e0u s\u1eafc v\u1eadt.<br \/>\n<em>\u0110\u00e1p \u00e1n:<\/em> C \u2014 chu k\u1ef3 ch\u1ec9 ph\u1ee5 thu\u1ed9c chi\u1ec1u d\u00e0i d\u00e2y l v\u00e0 gia t\u1ed1c tr\u1ecdng tr\u01b0\u1eddng g.<\/p>\n<h2>C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p v\u1ec1 con l\u1eafc \u0111\u01a1n<\/h2>\n<h3>Con l\u1eafc \u0111\u01a1n l\u00e0 g\u00ec?<\/h3>\n<p>Con l\u1eafc \u0111\u01a1n l\u00e0 h\u1ec7 g\u1ed3m m\u1ed9t v\u1eadt nh\u1ecf treo v\u00e0o s\u1ee3i d\u00e2y kh\u00f4ng d\u00e3n, kh\u1ed1i l\u01b0\u1ee3ng d\u00e2y kh\u00f4ng \u0111\u00e1ng k\u1ec3, dao \u0111\u1ed9ng qua l\u1ea1i quanh v\u1ecb tr\u00ed c\u00e2n b\u1eb1ng d\u01b0\u1edbi t\u00e1c d\u1ee5ng c\u1ee7a tr\u1ecdng l\u1ef1c.<\/p>\n<h3>C\u00f4ng th\u1ee9c chu k\u1ef3 con l\u1eafc \u0111\u01a1n l\u00e0 g\u00ec?<\/h3>\n<p>Chu k\u1ef3 \u0111\u01b0\u1ee3c t\u00ednh b\u1eb1ng T = 2\u03c0\u221a(l\/g), v\u1edbi l l\u00e0 chi\u1ec1u d\u00e0i d\u00e2y (m) v\u00e0 g l\u00e0 gia t\u1ed1c tr\u1ecdng tr\u01b0\u1eddng (m\/s\u00b2).<\/p>\n<h3>Chu k\u1ef3 con l\u1eafc \u0111\u01a1n c\u00f3 ph\u1ee5 thu\u1ed9c kh\u1ed1i l\u01b0\u1ee3ng kh\u00f4ng?<\/h3>\n<p>Kh\u00f4ng. Chu k\u1ef3 con l\u1eafc \u0111\u01a1n kh\u00f4ng ph\u1ee5 thu\u1ed9c v\u00e0o kh\u1ed1i l\u01b0\u1ee3ng v\u1eadt n\u1eb7ng m\u00e0 ch\u1ec9 ph\u1ee5 thu\u1ed9c chi\u1ec1u d\u00e0i d\u00e2y v\u00e0 gia t\u1ed1c tr\u1ecdng tr\u01b0\u1eddng.<\/p>\n<h3>Khi n\u00e0o con l\u1eafc \u0111\u01a1n dao \u0111\u1ed9ng \u0111i\u1ec1u h\u00f2a?<\/h3>\n<p>Con l\u1eafc \u0111\u01a1n dao \u0111\u1ed9ng \u0111i\u1ec1u h\u00f2a khi bi\u00ean \u0111\u1ed9 g\u00f3c nh\u1ecf (th\u01b0\u1eddng d\u01b0\u1edbi kho\u1ea3ng 10\u00b0) v\u00e0 b\u1ecf qua ma s\u00e1t, l\u1ef1c c\u1ea3n kh\u00f4ng kh\u00ed.<\/p>\n<h3>T\u1ea7n s\u1ed1 g\u00f3c c\u1ee7a con l\u1eafc \u0111\u01a1n t\u00ednh th\u1ebf n\u00e0o?<\/h3>\n<p>T\u1ea7n s\u1ed1 g\u00f3c \u0111\u01b0\u1ee3c t\u00ednh b\u1eb1ng \u03c9 = \u221a(g\/l) = 2\u03c0\/T, \u0111\u01a1n v\u1ecb l\u00e0 radian tr\u00ean gi\u00e2y (rad\/s).<\/p>\n<h3>Con l\u1eafc \u0111\u01a1n d\u00f9ng \u0111\u1ec3 l\u00e0m g\u00ec?<\/h3>\n<p>Con l\u1eafc \u0111\u01a1n \u0111\u01b0\u1ee3c d\u00f9ng trong \u0111\u1ed3ng h\u1ed3 qu\u1ea3 l\u1eafc \u0111\u1ec3 gi\u1eef nh\u1ecbp th\u1eddi gian v\u00e0 trong th\u00ed nghi\u1ec7m x\u00e1c \u0111\u1ecbnh gia t\u1ed1c tr\u1ecdng tr\u01b0\u1eddng g.<\/p>\n<h2>K\u1ebft lu\u1eadn<\/h2>\n<p>T\u00f3m l\u1ea1i, <strong>con l\u1eafc \u0111\u01a1n dao \u0111\u1ed9ng \u0111i\u1ec1u h\u00f2a v\u1edbi bi\u00ean \u0111\u1ed9 nh\u1ecf, chu k\u1ef3 T = 2\u03c0\u221a(l\/g), kh\u00f4ng ph\u1ee5 thu\u1ed9c kh\u1ed1i l\u01b0\u1ee3ng v\u1eadt n\u1eb7ng<\/strong>. Ghi nh\u1edb c\u00f4ng th\u1ee9c c\u00f9ng c\u00e1c nh\u1eadn x\u00e9t v\u1ec1 chu k\u1ef3 s\u1ebd gi\u00fap b\u1ea1n gi\u1ea3i nhanh ph\u1ea7n l\u1edbn b\u00e0i to\u00e1n dao \u0111\u1ed9ng v\u00e0 b\u00e0i th\u1ef1c h\u00e0nh \u0111o g. H\u00e3y luy\u1ec7n th\u00eam c\u00e1c v\u00ed d\u1ee5 tr\u00ean \u0111\u1ec3 n\u1eafm ch\u1eafc ki\u1ebfn th\u1ee9c tr\u01b0\u1edbc khi b\u01b0\u1edbc v\u00e0o c\u00e1c d\u1ea1ng b\u00e0i n\u00e2ng cao.<br \/>\n<script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Con l\u1eafc \u0111\u01a1n l\u00e0 g\u00ec?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Con l\u1eafc \u0111\u01a1n l\u00e0 h\u1ec7 g\u1ed3m m\u1ed9t v\u1eadt nh\u1ecf treo v\u00e0o s\u1ee3i d\u00e2y kh\u00f4ng d\u00e3n, kh\u1ed1i l\u01b0\u1ee3ng d\u00e2y kh\u00f4ng \u0111\u00e1ng k\u1ec3, dao \u0111\u1ed9ng qua l\u1ea1i quanh v\u1ecb tr\u00ed c\u00e2n b\u1eb1ng d\u01b0\u1edbi t\u00e1c d\u1ee5ng c\u1ee7a tr\u1ecdng l\u1ef1c.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"C\u00f4ng th\u1ee9c chu k\u1ef3 con l\u1eafc \u0111\u01a1n l\u00e0 g\u00ec?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Chu k\u1ef3 \u0111\u01b0\u1ee3c t\u00ednh b\u1eb1ng T = 2\u03c0\u221a(l\/g), v\u1edbi l l\u00e0 chi\u1ec1u d\u00e0i d\u00e2y (m) v\u00e0 g l\u00e0 gia t\u1ed1c tr\u1ecdng tr\u01b0\u1eddng (m\/s\u00b2).\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Chu k\u1ef3 con l\u1eafc \u0111\u01a1n c\u00f3 ph\u1ee5 thu\u1ed9c kh\u1ed1i l\u01b0\u1ee3ng kh\u00f4ng?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Kh\u00f4ng. Chu k\u1ef3 con l\u1eafc \u0111\u01a1n kh\u00f4ng ph\u1ee5 thu\u1ed9c v\u00e0o kh\u1ed1i l\u01b0\u1ee3ng v\u1eadt n\u1eb7ng m\u00e0 ch\u1ec9 ph\u1ee5 thu\u1ed9c chi\u1ec1u d\u00e0i d\u00e2y v\u00e0 gia t\u1ed1c tr\u1ecdng tr\u01b0\u1eddng.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Khi n\u00e0o con l\u1eafc \u0111\u01a1n dao \u0111\u1ed9ng \u0111i\u1ec1u h\u00f2a?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Con l\u1eafc \u0111\u01a1n dao \u0111\u1ed9ng \u0111i\u1ec1u h\u00f2a khi bi\u00ean \u0111\u1ed9 g\u00f3c nh\u1ecf (th\u01b0\u1eddng d\u01b0\u1edbi kho\u1ea3ng 10\u00b0) v\u00e0 b\u1ecf qua ma s\u00e1t, l\u1ef1c c\u1ea3n kh\u00f4ng kh\u00ed.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"T\u1ea7n s\u1ed1 g\u00f3c c\u1ee7a con l\u1eafc \u0111\u01a1n t\u00ednh th\u1ebf n\u00e0o?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"T\u1ea7n s\u1ed1 g\u00f3c \u0111\u01b0\u1ee3c t\u00ednh b\u1eb1ng \u03c9 = \u221a(g\/l) = 2\u03c0\/T, \u0111\u01a1n v\u1ecb l\u00e0 radian tr\u00ean gi\u00e2y (rad\/s).\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Con l\u1eafc \u0111\u01a1n d\u00f9ng \u0111\u1ec3 l\u00e0m g\u00ec?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Con l\u1eafc \u0111\u01a1n \u0111\u01b0\u1ee3c d\u00f9ng trong \u0111\u1ed3ng h\u1ed3 qu\u1ea3 l\u1eafc \u0111\u1ec3 gi\u1eef nh\u1ecbp th\u1eddi gian v\u00e0 trong th\u00ed nghi\u1ec7m x\u00e1c \u0111\u1ecbnh gia t\u1ed1c tr\u1ecdng tr\u01b0\u1eddng g.\"\n      }\n    }\n  ]\n}\n<\/script><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Con l\u1eafc \u0111\u01a1n g\u1ed3m m\u1ed9t v\u1eadt nh\u1ecf kh\u1ed1i l\u01b0\u1ee3ng m treo v\u00e0o \u0111\u1ea7u m\u1ed9t s\u1ee3i d\u00e2y kh\u00f4ng d\u00e3n, kh\u1ed1i l\u01b0\u1ee3ng kh\u00f4ng \u0111\u00e1ng k\u1ec3, c\u00f3 chi\u1ec1u d\u00e0i l; khi dao \u0111\u1ed9ng v\u1edbi bi\u00ean \u0111\u1ed9 g\u00f3c nh\u1ecf, con l\u1eafc \u0111\u01a1n dao \u0111\u1ed9ng \u0111i\u1ec1u h\u00f2a v\u1edbi chu k\u1ef3 T = 2\u03c0\u221a(l\/g). \u0110\u00e2y l\u00e0 m\u1ed9t trong nh\u1eefng m\u00f4 h\u00ecnh [&hellip;]<\/p>\n","protected":false},"author":102,"featured_media":570858,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_focuskw":"con l\u1eafc \u0111\u01a1n l\u00e0 g\u00ec","_yoast_wpseo_title":"Con l\u1eafc \u0111\u01a1n l\u00e0 g\u00ec? C\u00f4ng th\u1ee9c chu k\u1ef3 T = 2\u03c0\u221a(l\/g) v\u00e0 b\u00e0i t\u1eadp","_yoast_wpseo_metadesc":"Con l\u1eafc \u0111\u01a1n l\u00e0 g\u00ec? T\u00ecm hi\u1ec3u c\u00f4ng th\u1ee9c chu k\u1ef3 T = 2\u03c0\u221a(l\/g), t\u1ea7n s\u1ed1 g\u00f3c, n\u0103ng l\u01b0\u1ee3ng dao \u0111\u1ed9ng c\u00f9ng b\u00e0i t\u1eadp c\u00f3 l\u1eddi gi\u1ea3i chi ti\u1ebft cho V\u1eadt l\u00fd 12.","footnotes":""},"categories":[3910,30453],"tags":[],"class_list":["post-570850","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-kham-pha","category-kien-thuc"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.3 (Yoast SEO v27.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Con l\u1eafc \u0111\u01a1n l\u00e0 g\u00ec? C\u00f4ng th\u1ee9c chu k\u1ef3 T = 2\u03c0\u221a(l\/g) v\u00e0 b\u00e0i t\u1eadp<\/title>\n<meta name=\"description\" content=\"Con l\u1eafc \u0111\u01a1n l\u00e0 g\u00ec? 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