{"id":569546,"date":"2026-07-24T09:41:59","date_gmt":"2026-07-24T02:41:59","guid":{"rendered":"https:\/\/hoanghamobile.com\/tin-tuc\/?p=569546"},"modified":"2026-07-24T09:42:18","modified_gmt":"2026-07-24T02:42:18","slug":"dong-luong","status":"publish","type":"post","link":"https:\/\/hoanghamobile.com\/tin-tuc\/dong-luong\/","title":{"rendered":"\u0110\u1ed9ng l\u01b0\u1ee3ng l\u00e0 g\u00ec? C\u00f4ng th\u1ee9c, \u0111\u1ecbnh lu\u1eadt b\u1ea3o to\u00e0n v\u00e0 b\u00e0i t\u1eadp"},"content":{"rendered":"<p>Khi m\u1ed9t chi\u1ebfc xe t\u1ea3i n\u1eb7ng v\u00e0 m\u1ed9t chi\u1ebfc xe m\u00e1y c\u00f9ng ch\u1ea1y v\u1edbi v\u1eadn t\u1ed1c nh\u01b0 nhau, xe t\u1ea3i r\u00f5 r\u00e0ng kh\u00f3 d\u1eebng l\u1ea1i h\u01a1n nhi\u1ec1u. \u0110\u1ea1i l\u01b0\u1ee3ng v\u1eadt l\u00fd m\u00f4 t\u1ea3 s\u1ef1 kh\u00e1c bi\u1ec7t \u0111\u00f3 ch\u00ednh l\u00e0 \u0111\u1ed9ng l\u01b0\u1ee3ng. \u0110\u00e2y l\u00e0 m\u1ed9t kh\u00e1i ni\u1ec7m quan tr\u1ecdng trong ch\u01b0\u01a1ng tr\u00ecnh V\u1eadt l\u00fd l\u1edbp 10, g\u1eafn li\u1ec1n v\u1edbi \u0111\u1ecbnh lu\u1eadt b\u1ea3o to\u00e0n \u0111\u1ed9ng l\u01b0\u1ee3ng v\u00e0 c\u00e1ch gi\u1ea3i c\u00e1c b\u00e0i to\u00e1n va ch\u1ea1m, chuy\u1ec3n \u0111\u1ed9ng b\u1eb1ng ph\u1ea3n l\u1ef1c. Trong n\u1ed9i dung d\u01b0\u1edbi \u0111\u00e2y, b\u1ea1n s\u1ebd hi\u1ec3u r\u00f5 \u0111\u1ed9ng l\u01b0\u1ee3ng l\u00e0 g\u00ec, c\u00f4ng th\u1ee9c t\u00ednh, \u0111\u01a1n v\u1ecb, m\u1ed1i li\u00ean h\u1ec7 v\u1edbi l\u1ef1c c\u00f9ng nhi\u1ec1u v\u00ed d\u1ee5 c\u00f3 l\u1eddi gi\u1ea3i chi ti\u1ebft \u0111\u1ec3 d\u1ec5 d\u00e0ng v\u1eadn d\u1ee5ng.<\/p>\n<h2>\u0110\u1ed9ng l\u01b0\u1ee3ng l\u00e0 g\u00ec?<\/h2>\n<p>\u0110\u1ed9ng l\u01b0\u1ee3ng l\u00e0 m\u1ed9t \u0111\u1ea1i l\u01b0\u1ee3ng vect\u01a1 \u0111\u1eb7c tr\u01b0ng cho kh\u1ea3 n\u0103ng truy\u1ec1n chuy\u1ec3n \u0111\u1ed9ng c\u1ee7a m\u1ed9t v\u1eadt. \u0110\u1ed9ng l\u01b0\u1ee3ng c\u1ee7a m\u1ed9t v\u1eadt c\u00f3 h\u01b0\u1edbng c\u00f9ng v\u1edbi h\u01b0\u1edbng v\u1eadn t\u1ed1c, \u0111\u1eb7c tr\u01b0ng cho &#8220;l\u01b0\u1ee3ng chuy\u1ec3n \u0111\u1ed9ng&#8221; m\u00e0 v\u1eadt mang theo. V\u1eadt c\u00f3 kh\u1ed1i l\u01b0\u1ee3ng c\u00e0ng l\u1edbn v\u00e0 chuy\u1ec3n \u0111\u1ed9ng v\u1edbi v\u1eadn t\u1ed1c c\u00e0ng cao th\u00ec \u0111\u1ed9ng l\u01b0\u1ee3ng c\u00e0ng l\u1edbn. \u0110\u00e2y l\u00e0 l\u00fd do m\u1ed9t vi\u00ean \u0111\u1ea1n tuy nh\u1eb9 nh\u01b0ng bay r\u1ea5t nhanh v\u1eabn c\u00f3 \u0111\u1ed9ng l\u01b0\u1ee3ng \u0111\u1ee7 l\u1edbn \u0111\u1ec3 g\u00e2y t\u00e1c \u0111\u1ed9ng m\u1ea1nh.<\/p>\n<p><img fetchpriority=\"high\" decoding=\"async\" class=\"size-full wp-image-569829 aligncenter\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/dong-luong-1.jpg\" alt=\"dong-luong-1\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/dong-luong-1.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/dong-luong-1-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/dong-luong-1-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h2>C\u00f4ng th\u1ee9c t\u00ednh \u0111\u1ed9ng l\u01b0\u1ee3ng<\/h2>\n<p>\u0110\u1ed9ng l\u01b0\u1ee3ng \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh b\u1eb1ng t\u00edch c\u1ee7a kh\u1ed1i l\u01b0\u1ee3ng v\u00e0 v\u1eadn t\u1ed1c c\u1ee7a v\u1eadt. C\u00f4ng th\u1ee9c t\u00ednh nh\u01b0 sau:<\/p>\n<ul>\n<li><strong>p = m \u00d7 v<\/strong><\/li>\n<\/ul>\n<p>Trong \u0111\u00f3:<\/p>\n<ul>\n<li>p l\u00e0 \u0111\u1ed9ng l\u01b0\u1ee3ng (kg\u00b7m\/s), l\u00e0 \u0111\u1ea1i l\u01b0\u1ee3ng vect\u01a1 c\u00f9ng h\u01b0\u1edbng v\u1edbi v\u1eadn t\u1ed1c.<\/li>\n<li>m l\u00e0 kh\u1ed1i l\u01b0\u1ee3ng c\u1ee7a v\u1eadt (kg).<\/li>\n<li>v l\u00e0 v\u1eadn t\u1ed1c c\u1ee7a v\u1eadt (m\/s).<\/li>\n<\/ul>\n<p>V\u00ec \u0111\u1ed9ng l\u01b0\u1ee3ng l\u00e0 \u0111\u1ea1i l\u01b0\u1ee3ng vect\u01a1 n\u00ean khi c\u1ed9ng \u0111\u1ed9ng l\u01b0\u1ee3ng c\u1ee7a nhi\u1ec1u v\u1eadt, b\u1ea1n ph\u1ea3i c\u1ed9ng theo quy t\u1eafc c\u1ed9ng vect\u01a1 ch\u1ee9 kh\u00f4ng ch\u1ec9 c\u1ed9ng \u0111\u1ed9 l\u1edbn. N\u1ebfu c\u00e1c v\u1eadt chuy\u1ec3n \u0111\u1ed9ng c\u00f9ng ph\u01b0\u01a1ng, ta ch\u1ecdn m\u1ed9t chi\u1ec1u d\u01b0\u01a1ng v\u00e0 g\u00e1n d\u1ea5u cho v\u1eadn t\u1ed1c theo chi\u1ec1u \u0111\u00f3.<\/p>\n<p><img decoding=\"async\" class=\"size-full wp-image-569830 aligncenter\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/dong-luong-2.jpg\" alt=\"dong-luong-2\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/dong-luong-2.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/dong-luong-2-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/dong-luong-2-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h2>M\u1ed1i li\u00ean h\u1ec7 gi\u1eefa \u0111\u1ed9ng l\u01b0\u1ee3ng v\u00e0 l\u1ef1c<\/h2>\n<p>\u0110\u1ed9 bi\u1ebfn thi\u00ean \u0111\u1ed9ng l\u01b0\u1ee3ng c\u1ee7a m\u1ed9t v\u1eadt trong m\u1ed9t kho\u1ea3ng th\u1eddi gian b\u1eb1ng xung l\u01b0\u1ee3ng c\u1ee7a l\u1ef1c t\u00e1c d\u1ee5ng l\u00ean v\u1eadt trong kho\u1ea3ng th\u1eddi gian \u0111\u00f3. M\u1ed1i li\u00ean h\u1ec7 n\u00e0y \u0111\u01b0\u1ee3c vi\u1ebft d\u01b0\u1edbi d\u1ea1ng:<\/p>\n<ul>\n<li><strong>\u0394p = F \u00d7 \u0394t<\/strong><\/li>\n<\/ul>\n<p>Trong \u0111\u00f3 F l\u00e0 l\u1ef1c t\u00e1c d\u1ee5ng, \u0394t l\u00e0 th\u1eddi gian t\u00e1c d\u1ee5ng, c\u00f2n t\u00edch F \u00d7 \u0394t \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 xung l\u01b0\u1ee3ng c\u1ee7a l\u1ef1c. \u0110\u00e2y th\u1ef1c ch\u1ea5t l\u00e0 m\u1ed9t c\u00e1ch ph\u00e1t bi\u1ec3u kh\u00e1c c\u1ee7a \u0111\u1ecbnh lu\u1eadt II Niut\u01a1n. C\u00f4ng th\u1ee9c n\u00e0y gi\u1ea3i th\u00edch v\u00ec sao khi k\u00e9o d\u00e0i th\u1eddi gian va ch\u1ea1m (nh\u01b0 d\u00f9ng t\u00fai kh\u00ed, \u0111\u1ec7m m\u00fat), l\u1ef1c t\u00e1c d\u1ee5ng s\u1ebd gi\u1ea3m \u0111i d\u00f9 \u0111\u1ed9 bi\u1ebfn thi\u00ean \u0111\u1ed9ng l\u01b0\u1ee3ng kh\u00f4ng \u0111\u1ed5i.<\/p>\n<p><strong>Xem th\u00eam: <a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/khoi-luong-rieng\/\">Kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang l\u00e0 g\u00ec? C\u00f4ng th\u1ee9c D = m\/V v\u00e0 b\u1ea3ng tra<\/a><\/strong><br \/>\n<img decoding=\"async\" class=\"size-full wp-image-569831 aligncenter\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/dong-luong-3.jpg\" alt=\"dong-luong-3\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/dong-luong-3.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/dong-luong-3-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/dong-luong-3-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h2>\u0110\u1ecbnh lu\u1eadt b\u1ea3o to\u00e0n \u0111\u1ed9ng l\u01b0\u1ee3ng<\/h2>\n<p>Trong m\u1ed9t h\u1ec7 c\u00f4 l\u1eadp (h\u1ec7 k\u00edn, kh\u00f4ng c\u00f3 ngo\u1ea1i l\u1ef1c ho\u1eb7c t\u1ed5ng ngo\u1ea1i l\u1ef1c b\u1eb1ng 0), t\u1ed5ng \u0111\u1ed9ng l\u01b0\u1ee3ng c\u1ee7a h\u1ec7 \u0111\u01b0\u1ee3c b\u1ea3o to\u00e0n. V\u1edbi h\u1ec7 hai v\u1eadt, \u0111\u1ecbnh lu\u1eadt \u0111\u01b0\u1ee3c vi\u1ebft:<\/p>\n<ul>\n<li><strong>p\u2081 + p\u2082 = p\u2081\u2032 + p\u2082\u2032<\/strong> (t\u1ed5ng \u0111\u1ed9ng l\u01b0\u1ee3ng tr\u01b0\u1edbc b\u1eb1ng t\u1ed5ng \u0111\u1ed9ng l\u01b0\u1ee3ng sau)<\/li>\n<\/ul>\n<p>\u0110\u1ecbnh lu\u1eadt b\u1ea3o to\u00e0n \u0111\u1ed9ng l\u01b0\u1ee3ng \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng r\u1ed9ng r\u00e3i \u0111\u1ec3 gi\u1ea3i c\u00e1c b\u00e0i to\u00e1n va ch\u1ea1m v\u00e0 chuy\u1ec3n \u0111\u1ed9ng b\u1eb1ng ph\u1ea3n l\u1ef1c nh\u01b0 t\u00ean l\u1eeda, s\u00fang gi\u1eadt, \u0111\u1ea1n n\u1ed5. C\u00f3 hai ki\u1ec3u va ch\u1ea1m th\u01b0\u1eddng g\u1eb7p:<\/p>\n<ul>\n<li><strong>Va ch\u1ea1m m\u1ec1m:<\/strong> hai v\u1eadt d\u00ednh v\u00e0o nhau sau va ch\u1ea1m v\u00e0 chuy\u1ec3n \u0111\u1ed9ng c\u00f9ng m\u1ed9t v\u1eadn t\u1ed1c. Ch\u1ec9 \u0111\u1ed9ng l\u01b0\u1ee3ng \u0111\u01b0\u1ee3c b\u1ea3o to\u00e0n, m\u1ed9t ph\u1ea7n \u0111\u1ed9ng n\u0103ng b\u1ecb m\u1ea5t (chuy\u1ec3n th\u00e0nh nhi\u1ec7t, bi\u1ebfn d\u1ea1ng).<\/li>\n<li><strong>Va ch\u1ea1m \u0111\u00e0n h\u1ed3i:<\/strong> hai v\u1eadt t\u00e1ch r\u1eddi nhau sau va ch\u1ea1m. C\u1ea3 \u0111\u1ed9ng l\u01b0\u1ee3ng v\u00e0 \u0111\u1ed9ng n\u0103ng \u0111\u1ec1u \u0111\u01b0\u1ee3c b\u1ea3o to\u00e0n.<\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-569832 aligncenter\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/dong-luong-4.jpg\" alt=\"dong-luong-4\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/dong-luong-4.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/dong-luong-4-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/dong-luong-4-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h2>Ph\u00e2n bi\u1ec7t \u0111\u1ed9ng l\u01b0\u1ee3ng v\u00e0 \u0111\u1ed9ng n\u0103ng<\/h2>\n<p>Nhi\u1ec1u b\u1ea1n d\u1ec5 nh\u1ea7m \u0111\u1ed9ng l\u01b0\u1ee3ng v\u1edbi \u0111\u1ed9ng n\u0103ng v\u00ec c\u1ea3 hai \u0111\u1ec1u li\u00ean quan t\u1edbi kh\u1ed1i l\u01b0\u1ee3ng v\u00e0 v\u1eadn t\u1ed1c. B\u1ea3ng d\u01b0\u1edbi \u0111\u00e2y gi\u00fap b\u1ea1n ph\u00e2n bi\u1ec7t r\u00f5 hai \u0111\u1ea1i l\u01b0\u1ee3ng n\u00e0y.<\/p>\n<table border=\"1\" cellpadding=\"8\" cellspacing=\"0\">\n<thead>\n<tr>\n<th>Ti\u00eau ch\u00ed<\/th>\n<th>\u0110\u1ed9ng l\u01b0\u1ee3ng<\/th>\n<th>\u0110\u1ed9ng n\u0103ng<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>C\u00f4ng th\u1ee9c<\/td>\n<td>p = m\u00b7v<\/td>\n<td>W\u0111 = \u00bd\u00b7m\u00b7v\u00b2<\/td>\n<\/tr>\n<tr>\n<td>B\u1ea3n ch\u1ea5t<\/td>\n<td>\u0110\u1ea1i l\u01b0\u1ee3ng vect\u01a1 (c\u00f3 h\u01b0\u1edbng)<\/td>\n<td>\u0110\u1ea1i l\u01b0\u1ee3ng v\u00f4 h\u01b0\u1edbng (ch\u1ec9 c\u00f3 \u0111\u1ed9 l\u1edbn)<\/td>\n<\/tr>\n<tr>\n<td>\u0110\u01a1n v\u1ecb<\/td>\n<td>kg\u00b7m\/s<\/td>\n<td>J (jun)<\/td>\n<\/tr>\n<tr>\n<td>\u00dd ngh\u0129a<\/td>\n<td>\u0110\u1eb7c tr\u01b0ng cho kh\u1ea3 n\u0103ng truy\u1ec1n chuy\u1ec3n \u0111\u1ed9ng<\/td>\n<td>\u0110\u1eb7c tr\u01b0ng cho n\u0103ng l\u01b0\u1ee3ng do chuy\u1ec3n \u0111\u1ed9ng<\/td>\n<\/tr>\n<tr>\n<td>B\u1ea3o to\u00e0n<\/td>\n<td>Lu\u00f4n b\u1ea3o to\u00e0n trong h\u1ec7 k\u00edn<\/td>\n<td>Ch\u1ec9 b\u1ea3o to\u00e0n trong va ch\u1ea1m \u0111\u00e0n h\u1ed3i<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong>Xem th\u00eam: <a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/dong-nang-la-gi\/\">\u0110\u1ed9ng n\u0103ng l\u00e0 g\u00ec? C\u00f4ng th\u1ee9c W\u0111 = \u00bdmv\u00b2 v\u00e0 \u0111\u1ecbnh l\u00fd \u0111\u1ed9ng n\u0103ng<\/a><\/strong><\/p>\n<h2>V\u00ed d\u1ee5 v\u00e0 b\u00e0i t\u1eadp v\u1eadn d\u1ee5ng c\u00f3 l\u1eddi gi\u1ea3i<\/h2>\n<p>D\u01b0\u1edbi \u0111\u00e2y l\u00e0 c\u00e1c d\u1ea1ng b\u00e0i t\u1eadp ti\u00eau bi\u1ec3u v\u1ec1 \u0111\u1ed9ng l\u01b0\u1ee3ng, \u0111\u01b0\u1ee3c gi\u1ea3i chi ti\u1ebft t\u1eebng b\u01b0\u1edbc \u0111\u1ec3 b\u1ea1n d\u1ec5 theo d\u00f5i.<\/p>\n<h3>B\u00e0i 1: T\u00ednh \u0111\u1ed9ng l\u01b0\u1ee3ng c\u01a1 b\u1ea3n<\/h3>\n<p>M\u1ed9t v\u1eadt kh\u1ed1i l\u01b0\u1ee3ng 2 kg chuy\u1ec3n \u0111\u1ed9ng v\u1edbi v\u1eadn t\u1ed1c 5 m\/s. T\u00ednh \u0111\u1ed9ng l\u01b0\u1ee3ng c\u1ee7a v\u1eadt.<\/p>\n<p><em>L\u1eddi gi\u1ea3i:<\/em> \u00c1p d\u1ee5ng c\u00f4ng th\u1ee9c p = m\u00b7v = 2 \u00d7 5 = <strong>10 kg\u00b7m\/s<\/strong>. \u0110\u1ed9ng l\u01b0\u1ee3ng c\u00f3 h\u01b0\u1edbng c\u00f9ng h\u01b0\u1edbng chuy\u1ec3n \u0111\u1ed9ng c\u1ee7a v\u1eadt.<\/p>\n<h3>B\u00e0i 2: Va ch\u1ea1m m\u1ec1m<\/h3>\n<p>Xe A kh\u1ed1i l\u01b0\u1ee3ng 2 kg ch\u1ea1y v\u1edbi v\u1eadn t\u1ed1c 3 m\/s \u0111\u1ebfn va ch\u1ea1m v\u00e0 d\u00ednh v\u00e0o xe B kh\u1ed1i l\u01b0\u1ee3ng 1 kg \u0111ang \u0111\u1ee9ng y\u00ean. T\u00ednh v\u1eadn t\u1ed1c c\u1ee7a hai xe ngay sau va ch\u1ea1m.<\/p>\n<p><em>L\u1eddi gi\u1ea3i:<\/em> \u0110\u00e2y l\u00e0 va ch\u1ea1m m\u1ec1m n\u00ean \u00e1p d\u1ee5ng b\u1ea3o to\u00e0n \u0111\u1ed9ng l\u01b0\u1ee3ng: m<sub>A<\/sub>\u00b7v<sub>A<\/sub> + m<sub>B<\/sub>\u00b7v<sub>B<\/sub> = (m<sub>A<\/sub> + m<sub>B<\/sub>)\u00b7v.<\/p>\n<p>Thay s\u1ed1: 2 \u00d7 3 + 1 \u00d7 0 = (2 + 1) \u00d7 v \u2192 6 = 3v \u2192 v = <strong>2 m\/s<\/strong>. Hai xe c\u00f9ng chuy\u1ec3n \u0111\u1ed9ng theo h\u01b0\u1edbng ban \u0111\u1ea7u c\u1ee7a xe A v\u1edbi v\u1eadn t\u1ed1c 2 m\/s.<\/p>\n<h3>B\u00e0i 3: \u0110\u1ea1n n\u1ed5 (chuy\u1ec3n \u0111\u1ed9ng b\u1eb1ng ph\u1ea3n l\u1ef1c)<\/h3>\n<p>M\u1ed9t vi\u00ean \u0111\u1ea1n kh\u1ed1i l\u01b0\u1ee3ng 2 kg \u0111ang bay v\u1edbi v\u1eadn t\u1ed1c 250 m\/s th\u00ec n\u1ed5 th\u00e0nh hai m\u1ea3nh b\u1eb1ng nhau, m\u1ed7i m\u1ea3nh 1 kg. M\u1ea3nh th\u1ee9 nh\u1ea5t bay theo h\u01b0\u1edbng c\u0169 v\u1edbi v\u1eadn t\u1ed1c 300 m\/s. T\u00ednh v\u1eadn t\u1ed1c m\u1ea3nh th\u1ee9 hai.<\/p>\n<p><em>L\u1eddi gi\u1ea3i:<\/em> Ch\u1ecdn chi\u1ec1u d\u01b0\u01a1ng l\u00e0 chi\u1ec1u bay c\u1ee7a \u0111\u1ea1n. B\u1ea3o to\u00e0n \u0111\u1ed9ng l\u01b0\u1ee3ng: 2 \u00d7 250 = 1 \u00d7 300 + 1 \u00d7 v<sub>2<\/sub>.<\/p>\n<p>\u2192 500 = 300 + v<sub>2<\/sub> \u2192 v<sub>2<\/sub> = <strong>200 m\/s<\/strong>. M\u1ea3nh th\u1ee9 hai bay c\u00f9ng h\u01b0\u1edbng v\u1edbi v\u1eadn t\u1ed1c 200 m\/s.<\/p>\n<h3>B\u00e0i 4: S\u00fang gi\u1eadt l\u00f9i<\/h3>\n<p>M\u1ed9t kh\u1ea9u s\u00fang kh\u1ed1i l\u01b0\u1ee3ng 5 kg b\u1eafn ra vi\u00ean \u0111\u1ea1n 0,01 kg v\u1edbi v\u1eadn t\u1ed1c 600 m\/s. T\u00ednh v\u1eadn t\u1ed1c gi\u1eadt l\u00f9i c\u1ee7a s\u00fang.<\/p>\n<p><em>L\u1eddi gi\u1ea3i:<\/em> Tr\u01b0\u1edbc khi b\u1eafn, h\u1ec7 \u0111\u1ee9ng y\u00ean n\u00ean t\u1ed5ng \u0111\u1ed9ng l\u01b0\u1ee3ng b\u1eb1ng 0. B\u1ea3o to\u00e0n \u0111\u1ed9ng l\u01b0\u1ee3ng: M\u00b7V + m\u00b7v = 0 \u2192 V = \u2212(m\u00b7v)\/M.<\/p>\n<p>Thay s\u1ed1: V = \u2212(0,01 \u00d7 600)\/5 = <strong>\u22121,2 m\/s<\/strong>. D\u1ea5u tr\u1eeb cho bi\u1ebft s\u00fang gi\u1eadt l\u00f9i ng\u01b0\u1ee3c chi\u1ec1u v\u1edbi vi\u00ean \u0111\u1ea1n.<\/p>\n<h3>B\u00e0i 5: C\u00e2u h\u1ecfi tr\u1eafc nghi\u1ec7m<\/h3>\n<p>\u0110\u01a1n v\u1ecb c\u1ee7a \u0111\u1ed9ng l\u01b0\u1ee3ng l\u00e0 g\u00ec? A. kg\u00b7m\/s   B. N   C. J   D. W.<\/p>\n<p><em>L\u1eddi gi\u1ea3i:<\/em> \u0110\u00e1p \u00e1n \u0111\u00fang l\u00e0 <strong>A. kg\u00b7m\/s<\/strong>.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-569833 aligncenter\" src=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/dong-luong-5.jpg\" alt=\"dong-luong-5\" width=\"800\" height=\"450\" srcset=\"https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/dong-luong-5.jpg 800w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/dong-luong-5-300x169.jpg 300w, https:\/\/hoanghamobile.com\/tin-tuc\/wp-content\/uploads\/2026\/07\/dong-luong-5-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<h2>Nh\u1eefng l\u1ed7i th\u01b0\u1eddng g\u1eb7p khi l\u00e0m b\u00e0i v\u1ec1 \u0111\u1ed9ng l\u01b0\u1ee3ng<\/h2>\n<p>Khi gi\u1ea3i b\u00e0i t\u1eadp \u0111\u1ed9ng l\u01b0\u1ee3ng, b\u1ea1n n\u00ean tr\u00e1nh nh\u1eefng sai s\u00f3t ph\u1ed5 bi\u1ebfn sau \u0111\u00e2y:<\/p>\n<ul>\n<li><strong>Qu\u00ean \u0111\u1ed9ng l\u01b0\u1ee3ng l\u00e0 vect\u01a1:<\/strong> khi hai v\u1eadt chuy\u1ec3n \u0111\u1ed9ng ng\u01b0\u1ee3c chi\u1ec1u, ph\u1ea3i g\u00e1n d\u1ea5u \u00e2m cho v\u1eadn t\u1ed1c theo chi\u1ec1u d\u01b0\u01a1ng \u0111\u00e3 ch\u1ecdn, kh\u00f4ng \u0111\u01b0\u1ee3c c\u1ed9ng \u0111\u1ed9 l\u1edbn m\u1ed9t c\u00e1ch m\u00e1y m\u00f3c.<\/li>\n<li><strong>Nh\u1ea7m \u0111\u01a1n v\u1ecb:<\/strong> \u0111\u01a1n v\u1ecb c\u1ee7a \u0111\u1ed9ng l\u01b0\u1ee3ng l\u00e0 kg\u00b7m\/s, kh\u00f4ng ph\u1ea3i J (\u0111\u01a1n v\u1ecb c\u1ee7a \u0111\u1ed9ng n\u0103ng v\u00e0 n\u0103ng l\u01b0\u1ee3ng).<\/li>\n<li><strong>\u00c1p d\u1ee5ng b\u1ea3o to\u00e0n \u0111\u1ed9ng n\u0103ng cho va ch\u1ea1m m\u1ec1m:<\/strong> trong va ch\u1ea1m m\u1ec1m ch\u1ec9 c\u00f3 \u0111\u1ed9ng l\u01b0\u1ee3ng \u0111\u01b0\u1ee3c b\u1ea3o to\u00e0n, m\u1ed9t ph\u1ea7n \u0111\u1ed9ng n\u0103ng \u0111\u00e3 chuy\u1ec3n th\u00e0nh nhi\u1ec7t v\u00e0 bi\u1ebfn d\u1ea1ng.<\/li>\n<li><strong>B\u1ecf qu\u00ean v\u1eadt \u0111\u1ee9ng y\u00ean:<\/strong> v\u1eadt \u0111\u1ee9ng y\u00ean v\u1eabn c\u00f3 m\u1eb7t trong h\u1ec7, \u0111\u1ed9ng l\u01b0\u1ee3ng c\u1ee7a n\u00f3 b\u1eb1ng 0 nh\u01b0ng kh\u1ed1i l\u01b0\u1ee3ng v\u1eabn tham gia v\u00e0o t\u1ed5ng kh\u1ed1i l\u01b0\u1ee3ng sau va ch\u1ea1m m\u1ec1m.<\/li>\n<\/ul>\n<h2>C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p v\u1ec1 \u0111\u1ed9ng l\u01b0\u1ee3ng<\/h2>\n<h3>\u0110\u1ed9ng l\u01b0\u1ee3ng l\u00e0 g\u00ec?<\/h3>\n<p>\u0110\u1ed9ng l\u01b0\u1ee3ng l\u00e0 \u0111\u1ea1i l\u01b0\u1ee3ng vect\u01a1 \u0111\u1eb7c tr\u01b0ng cho kh\u1ea3 n\u0103ng truy\u1ec1n chuy\u1ec3n \u0111\u1ed9ng c\u1ee7a m\u1ed9t v\u1eadt, b\u1eb1ng t\u00edch kh\u1ed1i l\u01b0\u1ee3ng v\u00e0 v\u1eadn t\u1ed1c c\u1ee7a v\u1eadt.<\/p>\n<h3>C\u00f4ng th\u1ee9c t\u00ednh \u0111\u1ed9ng l\u01b0\u1ee3ng l\u00e0 g\u00ec?<\/h3>\n<p>C\u00f4ng th\u1ee9c t\u00ednh \u0111\u1ed9ng l\u01b0\u1ee3ng l\u00e0 p = m \u00d7 v, trong \u0111\u00f3 m l\u00e0 kh\u1ed1i l\u01b0\u1ee3ng (kg) v\u00e0 v l\u00e0 v\u1eadn t\u1ed1c (m\/s).<\/p>\n<h3>\u0110\u01a1n v\u1ecb c\u1ee7a \u0111\u1ed9ng l\u01b0\u1ee3ng l\u00e0 g\u00ec?<\/h3>\n<p>\u0110\u01a1n v\u1ecb c\u1ee7a \u0111\u1ed9ng l\u01b0\u1ee3ng l\u00e0 kg\u00b7m\/s (ki-l\u00f4-gam m\u00e9t tr\u00ean gi\u00e2y).<\/p>\n<h3>\u0110\u1ecbnh lu\u1eadt b\u1ea3o to\u00e0n \u0111\u1ed9ng l\u01b0\u1ee3ng ph\u00e1t bi\u1ec3u th\u1ebf n\u00e0o?<\/h3>\n<p>Trong m\u1ed9t h\u1ec7 c\u00f4 l\u1eadp (h\u1ec7 k\u00edn), t\u1ed5ng \u0111\u1ed9ng l\u01b0\u1ee3ng c\u1ee7a h\u1ec7 \u0111\u01b0\u1ee3c b\u1ea3o to\u00e0n, ngh\u0129a l\u00e0 t\u1ed5ng \u0111\u1ed9ng l\u01b0\u1ee3ng tr\u01b0\u1edbc b\u1eb1ng t\u1ed5ng \u0111\u1ed9ng l\u01b0\u1ee3ng sau t\u01b0\u01a1ng t\u00e1c.<\/p>\n<h3>\u0110\u1ed9ng l\u01b0\u1ee3ng c\u00f3 ph\u1ea3i \u0111\u1ea1i l\u01b0\u1ee3ng vect\u01a1 kh\u00f4ng?<\/h3>\n<p>C\u00f3, \u0111\u1ed9ng l\u01b0\u1ee3ng l\u00e0 \u0111\u1ea1i l\u01b0\u1ee3ng vect\u01a1 v\u00e0 lu\u00f4n c\u00f9ng h\u01b0\u1edbng v\u1edbi v\u1eadn t\u1ed1c c\u1ee7a v\u1eadt.<\/p>\n<h3>\u0110\u1ed9ng l\u01b0\u1ee3ng v\u00e0 \u0111\u1ed9ng n\u0103ng kh\u00e1c nhau th\u1ebf n\u00e0o?<\/h3>\n<p>\u0110\u1ed9ng l\u01b0\u1ee3ng l\u00e0 \u0111\u1ea1i l\u01b0\u1ee3ng vect\u01a1 (p = m\u00b7v, \u0111\u01a1n v\u1ecb kg\u00b7m\/s), c\u00f2n \u0111\u1ed9ng n\u0103ng l\u00e0 \u0111\u1ea1i l\u01b0\u1ee3ng v\u00f4 h\u01b0\u1edbng (W\u0111 = \u00bdmv\u00b2, \u0111\u01a1n v\u1ecb J). \u0110\u1ed9ng l\u01b0\u1ee3ng lu\u00f4n b\u1ea3o to\u00e0n trong h\u1ec7 k\u00edn, c\u00f2n \u0111\u1ed9ng n\u0103ng ch\u1ec9 b\u1ea3o to\u00e0n trong va ch\u1ea1m \u0111\u00e0n h\u1ed3i.<\/p>\n<h2>K\u1ebft lu\u1eadn<\/h2>\n<p>T\u00f3m l\u1ea1i, \u0111\u1ed9ng l\u01b0\u1ee3ng l\u00e0 \u0111\u1ea1i l\u01b0\u1ee3ng vect\u01a1 \u0111\u01b0\u1ee3c t\u00ednh theo c\u00f4ng th\u1ee9c p = m\u00b7v v\u00e0 c\u00f3 \u0111\u01a1n v\u1ecb l\u00e0 kg\u00b7m\/s. Trong m\u1ed9t h\u1ec7 c\u00f4 l\u1eadp, t\u1ed5ng \u0111\u1ed9ng l\u01b0\u1ee3ng c\u1ee7a h\u1ec7 lu\u00f4n \u0111\u01b0\u1ee3c b\u1ea3o to\u00e0n. N\u1eafm v\u1eefng \u0111\u1ecbnh lu\u1eadt b\u1ea3o to\u00e0n \u0111\u1ed9ng l\u01b0\u1ee3ng c\u00f9ng c\u00e1ch ph\u00e2n bi\u1ec7t v\u1edbi \u0111\u1ed9ng n\u0103ng s\u1ebd gi\u00fap b\u1ea1n gi\u1ea3i nhanh c\u00e1c b\u00e0i to\u00e1n va ch\u1ea1m v\u00e0 chuy\u1ec3n \u0111\u1ed9ng b\u1eb1ng ph\u1ea3n l\u1ef1c. \u0110\u1ec3 h\u1ecdc th\u00eam, m\u1eddi b\u1ea1n tham kh\u1ea3o c\u00e1c b\u00e0i <strong><a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/cong-thuc-tinh-quang-duong\/\">c\u00f4ng th\u1ee9c t\u00ednh qu\u00e3ng \u0111\u01b0\u1eddng<\/a><\/strong> v\u00e0 <strong><a href=\"https:\/\/hoanghamobile.com\/tin-tuc\/cong-thuc-tinh-dien-tro\/\">c\u00f4ng th\u1ee9c t\u00ednh \u0111i\u1ec7n tr\u1edf<\/a><\/strong> tr\u00ean chuy\u00ean m\u1ee5c tin t\u1ee9c c\u1ee7a Ho\u00e0ng H\u00e0 Mobile.<\/p>\n<p><script type=\"application\/ld+json\">\n{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"\u0110\u1ed9ng l\u01b0\u1ee3ng l\u00e0 g\u00ec?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"\u0110\u1ed9ng l\u01b0\u1ee3ng l\u00e0 \u0111\u1ea1i l\u01b0\u1ee3ng vect\u01a1 \u0111\u1eb7c tr\u01b0ng cho kh\u1ea3 n\u0103ng truy\u1ec1n chuy\u1ec3n \u0111\u1ed9ng c\u1ee7a m\u1ed9t v\u1eadt, b\u1eb1ng t\u00edch kh\u1ed1i l\u01b0\u1ee3ng v\u00e0 v\u1eadn t\u1ed1c c\u1ee7a v\u1eadt.\"}},{\"@type\":\"Question\",\"name\":\"C\u00f4ng th\u1ee9c t\u00ednh \u0111\u1ed9ng l\u01b0\u1ee3ng l\u00e0 g\u00ec?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"C\u00f4ng th\u1ee9c t\u00ednh \u0111\u1ed9ng l\u01b0\u1ee3ng l\u00e0 p = m \u00d7 v, trong \u0111\u00f3 m l\u00e0 kh\u1ed1i l\u01b0\u1ee3ng (kg) v\u00e0 v l\u00e0 v\u1eadn t\u1ed1c (m\/s).\"}},{\"@type\":\"Question\",\"name\":\"\u0110\u01a1n v\u1ecb c\u1ee7a \u0111\u1ed9ng l\u01b0\u1ee3ng l\u00e0 g\u00ec?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"\u0110\u01a1n v\u1ecb c\u1ee7a \u0111\u1ed9ng l\u01b0\u1ee3ng l\u00e0 kg\u00b7m\/s (ki-l\u00f4-gam m\u00e9t tr\u00ean gi\u00e2y).\"}},{\"@type\":\"Question\",\"name\":\"\u0110\u1ecbnh lu\u1eadt b\u1ea3o to\u00e0n \u0111\u1ed9ng l\u01b0\u1ee3ng ph\u00e1t bi\u1ec3u th\u1ebf n\u00e0o?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Trong m\u1ed9t h\u1ec7 c\u00f4 l\u1eadp (h\u1ec7 k\u00edn), t\u1ed5ng \u0111\u1ed9ng l\u01b0\u1ee3ng c\u1ee7a h\u1ec7 \u0111\u01b0\u1ee3c b\u1ea3o to\u00e0n, ngh\u0129a l\u00e0 t\u1ed5ng \u0111\u1ed9ng l\u01b0\u1ee3ng tr\u01b0\u1edbc b\u1eb1ng t\u1ed5ng \u0111\u1ed9ng l\u01b0\u1ee3ng sau t\u01b0\u01a1ng t\u00e1c.\"}},{\"@type\":\"Question\",\"name\":\"\u0110\u1ed9ng l\u01b0\u1ee3ng c\u00f3 ph\u1ea3i \u0111\u1ea1i l\u01b0\u1ee3ng vect\u01a1 kh\u00f4ng?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"C\u00f3, \u0111\u1ed9ng l\u01b0\u1ee3ng l\u00e0 \u0111\u1ea1i l\u01b0\u1ee3ng vect\u01a1 v\u00e0 lu\u00f4n c\u00f9ng h\u01b0\u1edbng v\u1edbi v\u1eadn t\u1ed1c c\u1ee7a v\u1eadt.\"}},{\"@type\":\"Question\",\"name\":\"\u0110\u1ed9ng l\u01b0\u1ee3ng v\u00e0 \u0111\u1ed9ng n\u0103ng kh\u00e1c nhau th\u1ebf n\u00e0o?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"\u0110\u1ed9ng l\u01b0\u1ee3ng l\u00e0 \u0111\u1ea1i l\u01b0\u1ee3ng vect\u01a1 (p = m\u00b7v, \u0111\u01a1n v\u1ecb kg\u00b7m\/s), c\u00f2n \u0111\u1ed9ng n\u0103ng l\u00e0 \u0111\u1ea1i l\u01b0\u1ee3ng v\u00f4 h\u01b0\u1edbng (W\u0111 = \u00bdmv\u00b2, \u0111\u01a1n v\u1ecb J). \u0110\u1ed9ng l\u01b0\u1ee3ng lu\u00f4n b\u1ea3o to\u00e0n trong h\u1ec7 k\u00edn, c\u00f2n \u0111\u1ed9ng n\u0103ng ch\u1ec9 b\u1ea3o to\u00e0n trong va ch\u1ea1m \u0111\u00e0n h\u1ed3i.\"}}]}\n<\/script><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Khi m\u1ed9t chi\u1ebfc xe t\u1ea3i n\u1eb7ng v\u00e0 m\u1ed9t chi\u1ebfc xe m\u00e1y c\u00f9ng ch\u1ea1y v\u1edbi v\u1eadn t\u1ed1c nh\u01b0 nhau, xe t\u1ea3i r\u00f5 r\u00e0ng kh\u00f3 d\u1eebng l\u1ea1i h\u01a1n nhi\u1ec1u. \u0110\u1ea1i l\u01b0\u1ee3ng v\u1eadt l\u00fd m\u00f4 t\u1ea3 s\u1ef1 kh\u00e1c bi\u1ec7t \u0111\u00f3 ch\u00ednh l\u00e0 \u0111\u1ed9ng l\u01b0\u1ee3ng. \u0110\u00e2y l\u00e0 m\u1ed9t kh\u00e1i ni\u1ec7m quan tr\u1ecdng trong ch\u01b0\u01a1ng tr\u00ecnh V\u1eadt l\u00fd l\u1edbp 10, [&hellip;]<\/p>\n","protected":false},"author":65,"featured_media":569827,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_focuskw":"\u0111\u1ed9ng l\u01b0\u1ee3ng l\u00e0 g\u00ec","_yoast_wpseo_title":"\u0110\u1ed9ng l\u01b0\u1ee3ng l\u00e0 g\u00ec? C\u00f4ng th\u1ee9c v\u00e0 \u0111\u1ecbnh lu\u1eadt b\u1ea3o to\u00e0n","_yoast_wpseo_metadesc":"\u0110\u1ed9ng l\u01b0\u1ee3ng l\u00e0 g\u00ec? B\u00e0i vi\u1ebft gi\u1ea3i th\u00edch c\u00f4ng th\u1ee9c p = m\u00b7v, \u0111\u01a1n v\u1ecb kg\u00b7m\/s v\u00e0 \u0111\u1ecbnh lu\u1eadt b\u1ea3o to\u00e0n \u0111\u1ed9ng l\u01b0\u1ee3ng, k\u00e8m b\u00e0i t\u1eadp va ch\u1ea1m c\u00f3 l\u1eddi gi\u1ea3i chi ti\u1ebft.","footnotes":""},"categories":[29235,3910,30453],"tags":[],"class_list":["post-569546","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-goc-to-mo","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>\u0110\u1ed9ng l\u01b0\u1ee3ng l\u00e0 g\u00ec? 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