{"id":567274,"date":"2026-07-23T09:46:25","date_gmt":"2026-07-23T02:46:25","guid":{"rendered":"https:\/\/hoanghamobile.com\/tin-tuc\/?p=567274"},"modified":"2026-07-23T09:46:25","modified_gmt":"2026-07-23T02:46:25","slug":"dong-nang-la-gi","status":"publish","type":"post","link":"https:\/\/hoanghamobile.com\/tin-tuc\/dong-nang-la-gi\/","title":{"rendered":"\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"},"content":{"rendered":"

\u0110\u1ed9ng n\u0103ng l\u00e0 d\u1ea1ng n\u0103ng l\u01b0\u1ee3ng m\u00e0 m\u1ed9t v\u1eadt c\u00f3 \u0111\u01b0\u1ee3c do n\u00f3 \u0111ang chuy\u1ec3n \u0111\u1ed9ng, \u0111\u01b0\u1ee3c t\u00ednh b\u1eb1ng c\u00f4ng th\u1ee9c W\u0111 = \u00bdmv\u00b2, trong \u0111\u00f3 m l\u00e0 kh\u1ed1i l\u01b0\u1ee3ng v\u00e0 v l\u00e0 v\u1eadn t\u1ed1c. \u0110\u00e2y l\u00e0 m\u1ed9t trong nh\u1eefng ki\u1ebfn th\u1ee9c n\u1ec1n t\u1ea3ng c\u1ee7a ph\u1ea7n N\u0103ng l\u01b0\u1ee3ng trong ch\u01b0\u01a1ng tr\u00ecnh V\u1eadt l\u00ed l\u1edbp 10. N\u1ebfu b\u1ea1n \u0111ang \u00f4n t\u1eadp v\u00e0 mu\u1ed1n hi\u1ec3u r\u00f5 b\u1ea3n ch\u1ea5t, c\u00f4ng th\u1ee9c, \u0111\u1eb7c \u0111i\u1ec3m c\u0169ng nh\u01b0 \u0111\u1ecbnh l\u00fd \u0111\u1ed9ng n\u0103ng, c\u00e1ch ph\u00e2n bi\u1ec7t v\u1edbi th\u1ebf n\u0103ng v\u00e0 luy\u1ec7n t\u1eadp qua c\u00e1c b\u00e0i to\u00e1n c\u00f3 l\u1eddi gi\u1ea3i t\u1eebng b\u01b0\u1edbc, th\u00ec to\u00e0n b\u1ed9 n\u1ed9i dung d\u01b0\u1edbi \u0111\u00e2y s\u1ebd gi\u00fap b\u1ea1n n\u1eafm ch\u1eafc ch\u1ee7 \u0111\u1ec1 n\u00e0y.<\/p>\n

\u0110\u1ed9ng n\u0103ng l\u00e0 g\u00ec?<\/b><\/h2>\n

\u0110\u1ed9ng n\u0103ng l\u00e0 n\u0103ng l\u01b0\u1ee3ng m\u00e0 m\u1ed9t v\u1eadt c\u00f3 \u0111\u01b0\u1ee3c do n\u00f3 \u0111ang chuy\u1ec3n \u0111\u1ed9ng. B\u1ea5t k\u1ef3 v\u1eadt n\u00e0o \u0111ang chuy\u1ec3n \u0111\u1ed9ng \u0111\u1ec1u mang \u0111\u1ed9ng n\u0103ng: m\u1ed9t chi\u1ebfc xe ch\u1ea1y tr\u00ean \u0111\u01b0\u1eddng, m\u1ed9t d\u00f2ng n\u01b0\u1edbc ch\u1ea3y hay m\u1ed9t vi\u00ean \u0111\u1ea1n \u0111ang bay. V\u1eadt chuy\u1ec3n \u0111\u1ed9ng c\u00e0ng nhanh v\u00e0 c\u00e0ng n\u1eb7ng th\u00ec \u0111\u1ed9ng n\u0103ng c\u00e0ng l\u1edbn. Khi v\u1eadt \u0111\u1ee9ng y\u00ean (v = 0), \u0111\u1ed9ng n\u0103ng c\u1ee7a n\u00f3 b\u1eb1ng 0. M\u1ed9t v\u1eadt mang \u0111\u1ed9ng n\u0103ng c\u00f3 kh\u1ea3 n\u0103ng sinh c\u00f4ng, v\u00ed d\u1ee5 d\u00f2ng n\u01b0\u1edbc ch\u1ea3y c\u00f3 th\u1ec3 \u0111\u1ea9y quay b\u00e1nh xe n\u01b0\u1edbc.<\/p>\n

\"dong-nang-la-gi-2\"<\/p>\n

C\u00f4ng th\u1ee9c t\u00ednh \u0111\u1ed9ng n\u0103ng<\/b><\/h2>\n

\u0110\u1ed9ng n\u0103ng c\u1ee7a m\u1ed9t v\u1eadt c\u00f3 kh\u1ed1i l\u01b0\u1ee3ng m \u0111ang chuy\u1ec3n \u0111\u1ed9ng v\u1edbi v\u1eadn t\u1ed1c v \u0111\u01b0\u1ee3c t\u00ednh b\u1eb1ng: W\u0111 = \u00bd m v\u00b2<\/b>. Trong \u0111\u00f3:<\/p>\n

    \n
  • W\u0111: \u0111\u1ed9ng n\u0103ng (\u0111\u01a1n v\u1ecb Jun, k\u00fd hi\u1ec7u J).<\/span><\/li>\n
  • m: kh\u1ed1i l\u01b0\u1ee3ng c\u1ee7a v\u1eadt (kil\u00f4gam, kg).<\/span><\/li>\n
  • v: v\u1eadn t\u1ed1c (m\u00e9t tr\u00ean gi\u00e2y, m\/s).<\/span><\/li>\n<\/ul>\n

    T\u1eeb c\u00f4ng th\u1ee9c, \u0111\u1ed9ng n\u0103ng t\u1ec9 l\u1ec7 thu\u1eadn v\u1edbi kh\u1ed1i l\u01b0\u1ee3ng v\u00e0 t\u1ec9 l\u1ec7 v\u1edbi b\u00ecnh ph\u01b0\u01a1ng v\u1eadn t\u1ed1c. Do \u0111\u00f3, khi v\u1eadn t\u1ed1c t\u0103ng g\u1ea5p \u0111\u00f4i th\u00ec \u0111\u1ed9ng n\u0103ng t\u0103ng g\u1ea5p b\u1ed1n l\u1ea7n, c\u00f2n khi kh\u1ed1i l\u01b0\u1ee3ng t\u0103ng g\u1ea5p \u0111\u00f4i th\u00ec \u0111\u1ed9ng n\u0103ng ch\u1ec9 t\u0103ng g\u1ea5p \u0111\u00f4i. L\u01b0u \u00fd r\u1eb1ng trong c\u00f4ng th\u1ee9c, c\u00e1c \u0111\u1ea1i l\u01b0\u1ee3ng ph\u1ea3i \u0111\u01b0\u1ee3c \u0111\u01b0a v\u1ec1 \u0111\u01a1n v\u1ecb chu\u1ea9n c\u1ee7a h\u1ec7 SI (m t\u00ednh b\u1eb1ng kg, v t\u00ednh b\u1eb1ng m\/s) th\u00ec k\u1ebft qu\u1ea3 m\u1edbi ra Jun.<\/p>\n

    \u0110\u1eb7c \u0111i\u1ec3m c\u1ee7a \u0111\u1ed9ng n\u0103ng l\u00e0 g\u00ec<\/b><\/h2>\n

    \u0110\u1ed9ng n\u0103ng c\u00f3 m\u1ed9t s\u1ed1 \u0111\u1eb7c \u0111i\u1ec3m quan tr\u1ecdng m\u00e0 b\u1ea1n c\u1ea7n ghi nh\u1edb:<\/p>\n

      \n
    • \u0110\u1ed9ng n\u0103ng l\u00e0 \u0111\u1ea1i l\u01b0\u1ee3ng v\u00f4 h\u01b0\u1edbng, lu\u00f4n c\u00f3 gi\u00e1 tr\u1ecb d\u01b0\u01a1ng ho\u1eb7c b\u1eb1ng 0 khi v\u1eadt \u0111\u1ee9ng y\u00ean; n\u00f3 kh\u00f4ng c\u00f3 h\u01b0\u1edbng nh\u01b0 v\u1eadn t\u1ed1c.<\/span><\/li>\n
    • \u0110\u1ed9ng n\u0103ng ph\u1ee5 thu\u1ed9c v\u00e0o h\u1ec7 quy chi\u1ebfu, v\u00ec v\u1eadn t\u1ed1c c\u1ee7a v\u1eadt thay \u0111\u1ed5i theo h\u1ec7 quy chi\u1ebfu \u0111\u01b0\u1ee3c ch\u1ecdn.<\/span><\/li>\n
    • \u0110\u01a1n v\u1ecb c\u1ee7a \u0111\u1ed9ng n\u0103ng l\u00e0 Jun (J), gi\u1ed1ng v\u1edbi \u0111\u01a1n v\u1ecb c\u1ee7a c\u00f4ng v\u00e0 c\u00e1c d\u1ea1ng n\u0103ng l\u01b0\u1ee3ng kh\u00e1c.<\/span><\/li>\n<\/ul>\n

      N\u1eafm v\u1eefng nh\u1eefng \u0111\u1eb7c \u0111i\u1ec3m n\u00e0y s\u1ebd gi\u00fap b\u1ea1n hi\u1ec3u r\u00f5 b\u1ea3n ch\u1ea5t c\u1ee7a \u0111\u1ed9ng n\u0103ng v\u00e0 v\u1eadn d\u1ee5ng ch\u00ednh x\u00e1c trong qu\u00e1 tr\u00ecnh gi\u1ea3i c\u00e1c b\u00e0i t\u1eadp V\u1eadt l\u00ed.<\/p>\n

      \"dong-nang-la-gi-1\"<\/p>\n

      \u0110\u1ecbnh l\u00fd \u0111\u1ed9ng n\u0103ng<\/b><\/h2>\n

      \u0110\u1ecbnh l\u00fd \u0111\u1ed9ng n\u0103ng cho bi\u1ebft \u0111\u1ed9 bi\u1ebfn thi\u00ean \u0111\u1ed9ng n\u0103ng c\u1ee7a m\u1ed9t v\u1eadt b\u1eb1ng c\u00f4ng c\u1ee7a t\u1ed5ng c\u00e1c l\u1ef1c t\u00e1c d\u1ee5ng l\u00ean v\u1eadt. C\u00f4ng th\u1ee9c vi\u1ebft d\u01b0\u1edbi d\u1ea1ng:<\/p>\n

      W\u01112 \u2212 W\u01111 = A<\/b>, t\u1ee9c l\u00e0 \u00bdmv\u2082\u00b2 \u2212 \u00bdmv\u2081\u00b2 = A<\/p>\n

      Trong \u0111\u00f3 W\u01111, W\u01112 l\u1ea7n l\u01b0\u1ee3t l\u00e0 \u0111\u1ed9ng n\u0103ng l\u00fac \u0111\u1ea7u v\u00e0 l\u00fac sau, c\u00f2n A l\u00e0 c\u00f4ng c\u1ee7a h\u1ee3p l\u1ef1c (t\u1ed5ng c\u00e1c l\u1ef1c) t\u00e1c d\u1ee5ng l\u00ean v\u1eadt. \u00dd ngh\u0129a c\u1ee7a \u0111\u1ecbnh l\u00fd: khi h\u1ee3p l\u1ef1c sinh c\u00f4ng d\u01b0\u01a1ng (A > 0) th\u00ec \u0111\u1ed9ng n\u0103ng t\u0103ng, v\u1eadt chuy\u1ec3n \u0111\u1ed9ng nhanh l\u00ean; khi h\u1ee3p l\u1ef1c sinh c\u00f4ng \u00e2m (A < 0), v\u00ed d\u1ee5 l\u1ef1c ma s\u00e1t, th\u00ec \u0111\u1ed9ng n\u0103ng gi\u1ea3m, v\u1eadt ch\u1eadm l\u1ea1i. \u0110\u00e2y l\u00e0 c\u00f4ng c\u1ee5 r\u1ea5t m\u1ea1nh \u0111\u1ec3 gi\u1ea3i c\u00e1c b\u00e0i to\u00e1n li\u00ean quan \u0111\u1ebfn l\u1ef1c, qu\u00e3ng \u0111\u01b0\u1eddng v\u00e0 v\u1eadn t\u1ed1c m\u00e0 kh\u00f4ng c\u1ea7n d\u00f9ng \u0111\u1ebfn gia t\u1ed1c.<\/p>\n

      Ph\u00e2n bi\u1ec7t \u0111\u1ed9ng n\u0103ng v\u00e0 th\u1ebf n\u0103ng<\/b><\/h2>\n

      \u0110\u1ed9ng n\u0103ng g\u1eafn v\u1edbi chuy\u1ec3n \u0111\u1ed9ng c\u1ee7a v\u1eadt, c\u00f2n th\u1ebf n\u0103ng g\u1eafn v\u1edbi v\u1ecb tr\u00ed ho\u1eb7c tr\u1ea1ng th\u00e1i c\u1ee7a v\u1eadt. B\u1ea3ng d\u01b0\u1edbi \u0111\u00e2y t\u00f3m t\u1eaft nh\u1eefng \u0111i\u1ec3m kh\u00e1c nhau c\u01a1 b\u1ea3n \u0111\u1ec3 b\u1ea1n d\u1ec5 ghi nh\u1edb:<\/p>\n\n\n\n\n\n\n\n\n\n
      Ti\u00eau ch\u00ed<\/th>\n\u0110\u1ed9ng n\u0103ng (W\u0111)<\/th>\nTh\u1ebf n\u0103ng (Wt)<\/th>\n<\/tr>\n<\/thead>\n
      Ngu\u1ed3n g\u1ed1c<\/td>\nDo v\u1eadt \u0111ang chuy\u1ec3n \u0111\u1ed9ng<\/td>\nDo v\u1ecb tr\u00ed ho\u1eb7c tr\u1ea1ng th\u00e1i c\u1ee7a v\u1eadt<\/td>\n<\/tr>\n
      C\u00f4ng th\u1ee9c<\/td>\nW\u0111 = \u00bdmv\u00b2<\/td>\nWt = mgh (th\u1ebf n\u0103ng tr\u1ecdng tr\u01b0\u1eddng)<\/td>\n<\/tr>\n
      Ph\u1ee5 thu\u1ed9c v\u00e0o<\/td>\nKh\u1ed1i l\u01b0\u1ee3ng v\u00e0 v\u1eadn t\u1ed1c<\/td>\nKh\u1ed1i l\u01b0\u1ee3ng v\u00e0 \u0111\u1ed9 cao (ho\u1eb7c \u0111\u1ed9 bi\u1ebfn d\u1ea1ng)<\/td>\n<\/tr>\n
      Khi v\u1eadt \u0111\u1ee9ng y\u00ean<\/td>\nB\u1eb1ng 0<\/td>\nC\u00f3 th\u1ec3 kh\u00e1c 0 (n\u1ebfu \u1edf tr\u00ean cao)<\/td>\n<\/tr>\n
      \u0110\u01a1n v\u1ecb<\/td>\nJun (J)<\/td>\nJun (J)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

      T\u1ed5ng \u0111\u1ed9ng n\u0103ng v\u00e0 th\u1ebf n\u0103ng c\u1ee7a v\u1eadt g\u1ecdi l\u00e0 c\u01a1 n\u0103ng. Trong nhi\u1ec1u tr\u01b0\u1eddng h\u1ee3p, \u0111\u1ed9ng n\u0103ng v\u00e0 th\u1ebf n\u0103ng c\u00f3 th\u1ec3 chuy\u1ec3n h\u00f3a qua l\u1ea1i l\u1eabn nhau, v\u00ed d\u1ee5 khi m\u1ed9t qu\u1ea3 b\u00f3ng r\u01a1i xu\u1ed1ng th\u00ec th\u1ebf n\u0103ng gi\u1ea3m d\u1ea7n v\u00e0 \u0111\u1ed9ng n\u0103ng t\u0103ng d\u1ea7n.<\/p>\n

      \"dong-nang-la-gi-4\"<\/p>\n

      B\u00e0i t\u1eadp v\u1eadn d\u1ee5ng c\u00f3 l\u1eddi gi\u1ea3i \u0111\u1ed9ng n\u0103ng l\u00e0 g\u00ec<\/b><\/h2>\n

      C\u00f9ng luy\u1ec7n t\u1eadp qua c\u00e1c d\u1ea1ng b\u00e0i ph\u1ed5 bi\u1ebfn, tr\u00ecnh b\u00e0y l\u1eddi gi\u1ea3i t\u1eebng b\u01b0\u1edbc \u0111\u1ec3 b\u1ea1n d\u1ec5 theo d\u00f5i.<\/p>\n

      B\u00e0i 1 (t\u00ednh \u0111\u1ed9ng n\u0103ng).<\/b> M\u1ed9t v\u1eadt kh\u1ed1i l\u01b0\u1ee3ng 2 kg chuy\u1ec3n \u0111\u1ed9ng v\u1edbi v\u1eadn t\u1ed1c 3 m\/s. T\u00ednh \u0111\u1ed9ng n\u0103ng.
      \nB\u01b0\u1edbc 1: X\u00e1c \u0111\u1ecbnh m = 2 kg, v = 3 m\/s.
      \nB\u01b0\u1edbc 2: \u00c1p d\u1ee5ng c\u00f4ng th\u1ee9c W\u0111 = \u00bdmv\u00b2 = \u00bd \u00d7 2 \u00d7 3\u00b2.
      \nB\u01b0\u1edbc 3: T\u00ednh k\u1ebft qu\u1ea3 W\u0111 = \u00bd \u00d7 2 \u00d7 9 = 9 J.<\/p>\n

      B\u00e0i 2 (v\u1eadn t\u1ed1c t\u0103ng g\u1ea5p \u0111\u00f4i).<\/b> C\u00f9ng v\u1eadt \u0111\u00f3 nh\u01b0ng v\u1eadn t\u1ed1c t\u0103ng l\u00ean 6 m\/s th\u00ec \u0111\u1ed9ng n\u0103ng b\u1eb1ng bao nhi\u00eau?
      \nW\u0111 = \u00bd \u00d7 2 \u00d7 6\u00b2 = \u00bd \u00d7 2 \u00d7 36 = 36 J. K\u1ebft qu\u1ea3 g\u1ea5p 4 l\u1ea7n b\u00e0i 1, \u0111\u00fang v\u1edbi quy lu\u1eadt \u0111\u1ed9ng n\u0103ng t\u1ec9 l\u1ec7 v\u1edbi b\u00ecnh ph\u01b0\u01a1ng v\u1eadn t\u1ed1c.<\/p>\n

      B\u00e0i 3 (t\u00ecm v\u1eadn t\u1ed1c t\u1eeb \u0111\u1ed9ng n\u0103ng).<\/b> M\u1ed9t v\u1eadt c\u00f3 \u0111\u1ed9ng n\u0103ng 50 J v\u00e0 kh\u1ed1i l\u01b0\u1ee3ng 4 kg. T\u00ednh v\u1eadn t\u1ed1c.
      \nT\u1eeb W\u0111 = \u00bdmv\u00b2 suy ra v\u00b2 = 2W\u0111\/m = (2 \u00d7 50)\/4 = 25, n\u00ean v = 5 m\/s.<\/p>\n

      B\u00e0i 4 (\u00e1p d\u1ee5ng \u0111\u1ecbnh l\u00fd \u0111\u1ed9ng n\u0103ng).<\/b> M\u1ed9t v\u1eadt kh\u1ed1i l\u01b0\u1ee3ng 1 kg \u0111ang chuy\u1ec3n \u0111\u1ed9ng v\u1edbi v\u1eadn t\u1ed1c 4 m\/s th\u00ec ch\u1ecbu h\u1ee3p l\u1ef1c sinh c\u00f4ng 6 J theo chi\u1ec1u chuy\u1ec3n \u0111\u1ed9ng. T\u00ednh v\u1eadn t\u1ed1c l\u00fac sau.
      \nB\u01b0\u1edbc 1: W\u01111 = \u00bd \u00d7 1 \u00d7 4\u00b2 = 8 J.
      \nB\u01b0\u1edbc 2: Theo \u0111\u1ecbnh l\u00fd \u0111\u1ed9ng n\u0103ng, W\u01112 = W\u01111 + A = 8 + 6 = 14 J.
      \nB\u01b0\u1edbc 3: T\u1eeb W\u01112 = \u00bdmv\u2082\u00b2 \u21d2 v\u2082\u00b2 = 2 \u00d7 14 \/ 1 = 28 \u21d2 v\u2082 \u2248 5,29 m\/s.<\/p>\n

      B\u00e0i 5 (\u0111\u1ed5i \u0111\u01a1n v\u1ecb).<\/b> M\u1ed9t \u00f4 t\u00f4 1 t\u1ea5n ch\u1ea1y v\u1edbi v\u1eadn t\u1ed1c 36 km\/h. T\u00ednh \u0111\u1ed9ng n\u0103ng.
      \nB\u01b0\u1edbc 1: \u0110\u1ed5i \u0111\u01a1n v\u1ecb: m = 1 t\u1ea5n = 1000 kg; v = 36 km\/h = 36 \u00d7 1000\/3600 = 10 m\/s.
      \nB\u01b0\u1edbc 2: W\u0111 = \u00bd \u00d7 1000 \u00d7 10\u00b2 = \u00bd \u00d7 1000 \u00d7 100 = 50 000 J = 50 kJ.<\/p>\n

      B\u00e0i 6 (tr\u1eafc nghi\u1ec7m).<\/b> Khi v\u1eadn t\u1ed1c t\u0103ng g\u1ea5p \u0111\u00f4i th\u00ec \u0111\u1ed9ng n\u0103ng thay \u0111\u1ed5i th\u1ebf n\u00e0o? A. Kh\u00f4ng \u0111\u1ed5i B. T\u0103ng g\u1ea5p \u0111\u00f4i C. T\u0103ng g\u1ea5p b\u1ed1n D. Gi\u1ea3m m\u1ed9t n\u1eeda. \u0110\u00e1p \u00e1n: C.<\/p>\n

      Nh\u1eefng l\u1ed7i th\u01b0\u1eddng g\u1eb7p khi t\u00ednh \u0111\u1ed9ng n\u0103ng<\/b><\/h2>\n

      Khi l\u00e0m b\u00e0i, h\u1ecdc sinh hay m\u1eafc m\u1ed9t s\u1ed1 l\u1ed7i khi\u1ebfn k\u1ebft qu\u1ea3 sai l\u1ec7ch. B\u1ea1n n\u00ean l\u01b0u \u00fd tr\u00e1nh nh\u1eefng sai s\u00f3t sau:<\/p>\n

        \n
      • Qu\u00ean b\u00ecnh ph\u01b0\u01a1ng v\u1eadn t\u1ed1c, ch\u1ec9 nh\u00e2n m v\u1edbi v thay v\u00ec v\u1edbi v\u00b2.<\/span><\/li>\n
      • Kh\u00f4ng \u0111\u1ed5i \u0111\u01a1n v\u1ecb v\u1ec1 h\u1ec7 SI: \u0111\u1ec3 v\u1eadn t\u1ed1c \u1edf km\/h ho\u1eb7c kh\u1ed1i l\u01b0\u1ee3ng \u1edf gam, t\u1ea5n m\u00e0 ch\u01b0a quy v\u1ec1 m\/s v\u00e0 kg.<\/span><\/li>\n
      • Qu\u00ean nh\u00e2n v\u1edbi h\u1ec7 s\u1ed1 \u00bd trong c\u00f4ng th\u1ee9c W\u0111 = \u00bdmv\u00b2.<\/span><\/li>\n
      • Nh\u1ea7m d\u1ea5u c\u00f4ng trong \u0111\u1ecbnh l\u00fd \u0111\u1ed9ng n\u0103ng: l\u1ef1c c\u1ea3n (ma s\u00e1t) sinh c\u00f4ng \u00e2m l\u00e0m \u0111\u1ed9ng n\u0103ng gi\u1ea3m.<\/span><\/li>\n
      • Nh\u1ea7m \u0111\u1ed9ng n\u0103ng v\u1edbi \u0111\u1ed9ng l\u01b0\u1ee3ng (p = mv). \u0110\u1ed9ng n\u0103ng l\u00e0 \u0111\u1ea1i l\u01b0\u1ee3ng v\u00f4 h\u01b0\u1edbng, \u0111\u01a1n v\u1ecb Jun; \u0111\u1ed9ng l\u01b0\u1ee3ng l\u00e0 \u0111\u1ea1i l\u01b0\u1ee3ng vect\u01a1, \u0111\u01a1n v\u1ecb kg\u00b7m\/s.<\/span><\/li>\n<\/ul>\n

        \u1ee8ng d\u1ee5ng c\u1ee7a \u0111\u1ed9ng n\u0103ng trong th\u1ef1c t\u1ebf<\/b><\/h2>\n

        \u0110\u1ed9ng n\u0103ng c\u00f3 nhi\u1ec1u \u1ee9ng d\u1ee5ng quan tr\u1ecdng: n\u0103ng l\u01b0\u1ee3ng c\u1ee7a gi\u00f3 (\u0111\u1ed9ng n\u0103ng c\u1ee7a kh\u00f4ng kh\u00ed chuy\u1ec3n \u0111\u1ed9ng) \u0111\u01b0\u1ee3c d\u00f9ng \u0111\u1ec3 quay tua-bin \u0111i\u1ec7n gi\u00f3; \u0111\u1ed9ng n\u0103ng c\u1ee7a d\u00f2ng n\u01b0\u1edbc l\u00e0m quay tua-bin th\u1ee7y \u0111i\u1ec7n; b\u00faa m\u00e1y, m\u00e1y \u0111\u00f3ng c\u1ecdc l\u1ee3i d\u1ee5ng \u0111\u1ed9ng n\u0103ng c\u1ee7a v\u1eadt n\u1eb7ng r\u01a1i xu\u1ed1ng. Hi\u1ec3u v\u1ec1 \u0111\u1ed9ng n\u0103ng gi\u00fap gi\u1ea3i th\u00edch v\u00e0 \u1ee9ng d\u1ee5ng nhi\u1ec1u thi\u1ebft b\u1ecb, hi\u1ec7n t\u01b0\u1ee3ng trong \u0111\u1eddi s\u1ed1ng v\u00e0 k\u1ef9 thu\u1eadt.<\/p>\n

        \"dong-nang-la-gi-3\"<\/p>\n

        C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p v\u1ec1 \u0111\u1ed9ng n\u0103ng<\/b><\/h2>\n

        \u0110\u1ed9ng n\u0103ng l\u00e0 g\u00ec?<\/b><\/h3>\n

        \u0110\u1ed9ng n\u0103ng l\u00e0 n\u0103ng l\u01b0\u1ee3ng m\u00e0 m\u1ed9t v\u1eadt c\u00f3 \u0111\u01b0\u1ee3c do n\u00f3 \u0111ang chuy\u1ec3n \u0111\u1ed9ng.<\/p>\n

        C\u00f4ng th\u1ee9c t\u00ednh \u0111\u1ed9ng n\u0103ng l\u00e0 g\u00ec?<\/b><\/h3>\n

        C\u00f4ng th\u1ee9c l\u00e0 W\u0111 = \u00bdmv\u00b2, v\u1edbi m l\u00e0 kh\u1ed1i l\u01b0\u1ee3ng v\u00e0 v l\u00e0 v\u1eadn t\u1ed1c; \u0111\u01a1n v\u1ecb l\u00e0 Jun (J).<\/p>\n

        Khi v\u1eadn t\u1ed1c t\u0103ng g\u1ea5p \u0111\u00f4i, \u0111\u1ed9ng n\u0103ng thay \u0111\u1ed5i th\u1ebf n\u00e0o?<\/b><\/h3>\n

        \u0110\u1ed9ng n\u0103ng t\u0103ng g\u1ea5p b\u1ed1n l\u1ea7n, v\u00ec \u0111\u1ed9ng n\u0103ng t\u1ec9 l\u1ec7 v\u1edbi b\u00ecnh ph\u01b0\u01a1ng v\u1eadn t\u1ed1c.<\/p>\n

        \u0110\u01a1n v\u1ecb c\u1ee7a \u0111\u1ed9ng n\u0103ng l\u00e0 g\u00ec?<\/b><\/h3>\n

        \u0110\u01a1n v\u1ecb c\u1ee7a \u0111\u1ed9ng n\u0103ng l\u00e0 Jun (J), gi\u1ed1ng \u0111\u01a1n v\u1ecb c\u1ee7a c\u00f4ng v\u00e0 c\u00e1c d\u1ea1ng n\u0103ng l\u01b0\u1ee3ng kh\u00e1c.<\/p>\n

        \u0110\u1ecbnh l\u00fd \u0111\u1ed9ng n\u0103ng ph\u00e1t bi\u1ec3u th\u1ebf n\u00e0o?<\/b><\/h3>\n

        \u0110\u1ed9 bi\u1ebfn thi\u00ean \u0111\u1ed9ng n\u0103ng c\u1ee7a m\u1ed9t v\u1eadt b\u1eb1ng c\u00f4ng c\u1ee7a h\u1ee3p l\u1ef1c t\u00e1c d\u1ee5ng l\u00ean v\u1eadt: W\u01112 \u2212 W\u01111 = A.<\/p>\n

        \u0110\u1ed9ng n\u0103ng kh\u00e1c th\u1ebf n\u0103ng th\u1ebf n\u00e0o?<\/b><\/h3>\n

        \u0110\u1ed9ng n\u0103ng g\u1eafn v\u1edbi chuy\u1ec3n \u0111\u1ed9ng, c\u00f2n th\u1ebf n\u0103ng g\u1eafn v\u1edbi v\u1ecb tr\u00ed ho\u1eb7c tr\u1ea1ng th\u00e1i c\u1ee7a v\u1eadt.<\/p>\n

        K\u1ebft lu\u1eadn<\/b><\/h2>\n

        T\u00f3m l\u1ea1i, \u0111\u1ed9ng n\u0103ng l\u00e0 n\u0103ng l\u01b0\u1ee3ng do chuy\u1ec3n \u0111\u1ed9ng, t\u00ednh b\u1eb1ng W\u0111 = \u00bdmv\u00b2 v\u00e0 \u0111o b\u1eb1ng Jun (J). Khi n\u1eafm v\u1eefng c\u00f4ng th\u1ee9c, \u0111\u01a1n v\u1ecb v\u00e0 \u0111\u1ecbnh l\u00fd \u0111\u1ed9ng n\u0103ng W\u01112 \u2212 W\u01111 = A, b\u1ea1n s\u1ebd gi\u1ea3i nhanh v\u00e0 ch\u00ednh x\u00e1c c\u00e1c b\u00e0i to\u00e1n v\u1ec1 n\u0103ng l\u01b0\u1ee3ng v\u00e0 chuy\u1ec3n \u0111\u1ed9ng. \u0110\u1ec3 h\u1ecdc th\u00eam, m\u1eddi b\u1ea1n tham kh\u1ea3o c\u00e1c b\u00e0i th\u1ebf n\u0103ng l\u00e0 g\u00ec<\/a>, c\u01a1 n\u0103ng l\u00e0 g\u00ec<\/a> v\u00e0 n\u1ed9i n\u0103ng l\u00e0 g\u00ec<\/a> tr\u00ean chuy\u00ean m\u1ee5c tin t\u1ee9c c\u1ee7a Ho\u00e0ng H\u00e0 Mobile.<\/p>\n