{"id":2135,"date":"2026-08-31T08:08:22","date_gmt":"2026-08-31T08:08:22","guid":{"rendered":"https:\/\/wayhope.kro.kr\/?p=2135"},"modified":"2026-08-31T08:09:45","modified_gmt":"2026-08-31T08:09:45","slug":"%ec%9c%a0%ec%b2%b4-%ed%95%b5%ec%8b%ac-%ec%a0%95%eb%a6%ac","status":"publish","type":"post","link":"https:\/\/wayhope.kro.kr\/?p=2135","title":{"rendered":"\uc720\uccb4 \ud575\uc2ec \uc815\ub9ac"},"content":{"rendered":"\n

\uc720\uccb4(Fluid)\ub294 \uace0\uccb4\ucc98\ub7fc \uc77c\uc815\ud55c \ud615\ud0dc\ub97c \uc720\uc9c0\ud558\uc9c0 \uc54a\uace0 \ud750\ub97c \uc218 \uc788\ub294 \ubb3c\uc9c8<\/strong>\uc774\ub2e4.<\/p>\n\n\n\n

\ub300\ud45c\uc801\uc73c\ub85c \uc561\uccb4\uc640 \uae30\uccb4\uac00 \uc788\ub2e4.<\/p>\n\n\n\n

\uc720\uccb4 \uc5ed\ud559\uc5d0\uc11c \uc911\uc694\ud55c \uac83\uc740<\/p>\n\n\n\n

\ubc00\ub3c4 -> \uc555\ub825 -> \ubd80\ub825<\/code><\/p>\n\n\n\n

\uc720\uccb4 + \ubb3c\uccb4\uc758 \uc0c1\ub300 \uc6b4\ub3d9 -> \uc800\ud56d -> \ud56d\ub825<\/code><\/p>\n\n\n\n

\uc720\uccb4\uc758 \uc18d\ub3c4\/\uc810\uc131 -> \ud750\ub984\uc758 \ud2b9\uc131<\/code><\/p>\n\n\n\n

\uc774\ub2e4.<\/p>\n\n\n\n

\uac8c\uc784 \ubb3c\ub9ac\uc5d0\uc11c\ub294 \uc2e4\uc81c \uc720\uccb4\ub97c \uc815\ud655\ud558\uac8c \uc2dc\ubbac\ub808\uc774\uc158\ud558\uc9c0 \uc54a\ub354\ub77c\ub3c4 \ubd80\ub825, \uacf5\uae30 \uc800\ud56d, \ubb3c \uc800\ud56d, \ud56d\ub825<\/strong> \ub4f1\uc744 \uadfc\uc0ac\ud558\ub294 \ub370 \uc774 \uac1c\ub150\ub4e4\uc774 \uc0ac\uc6a9\ub41c\ub2e4.<\/p>\n\n\n\n

\n\n\n\n

\ubc00\ub3c4<\/h2>\n\n\n\n

\ubc00\ub3c4(Density)<\/strong>\ub294 \ub2e8\uc704 \ubd80\ud53c\ub2f9 \uc9c8\ub7c9\uc774\ub2e4.<\/p>\n\n\n\n

\u03c1 = m\/V<\/code><\/p>\n\n\n\n

\u03c1 -> \ubc00\ub3c4<\/code><\/p>\n\n\n\n

m -> \uc9c8\ub7c9<\/code><\/p>\n\n\n\n

V -> \ubd80\ud53c<\/code><\/p>\n\n\n\n

\uc774\ub2e4.<\/p>\n\n\n\n

\ub2e8\uc704\ub294<\/p>\n\n\n\n

kg\/m\u00b3<\/code><\/p>\n\n\n\n

\ub97c \uc0ac\uc6a9\ud55c\ub2e4.<\/p>\n\n\n\n

\ubc00\ub3c4\uac00 \ub192\ub2e4\ub294 \uac83\uc740 \uac19\uc740 \ubd80\ud53c \uc548\uc5d0 \ub354 \ub9ce\uc740 \uc9c8\ub7c9\uc774 \ub4e4\uc5b4 \uc788\ub2e4\ub294 \uc758\ubbf8\ub2e4.<\/p>\n\n\n\n

\ubc00\ub3c4\ub294 \ubd80\ub825\uacfc \uc720\uccb4 \uc800\ud56d\uc744 \uc774\ud574\ud558\ub294 \ub370 \uc911\uc694\ud55c \ubcc0\uc218\ub2e4.<\/p>\n\n\n\n

\uc608\ub97c \ub4e4\uc5b4<\/p>\n\n\n\n

\ubb3c\uc758 \ubc00\ub3c4 \u2248 1000 kg\/m\u00b3<\/code><\/p>\n\n\n\n

\uc815\ub3c4\ub85c \uc0dd\uac01\ud560 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n

\uacf5\uae30\uc758 \ubc00\ub3c4\ub294 \ubb3c\ubcf4\ub2e4 \ud6e8\uc52c \uc791\ub2e4.<\/p>\n\n\n\n

\ub530\ub77c\uc11c \uac19\uc740 \ubd80\ud53c\uc758 \ubb3c\uacfc \uacf5\uae30\ub294 \uc9c8\ub7c9 \ucc28\uc774\uac00 \ub9e4\uc6b0 \ud06c\ub2e4.<\/p>\n\n\n\n

\n\n\n\n

\uc555\ub825<\/h2>\n\n\n\n

\uc555\ub825(Pressure)<\/strong>\uc740 \ub2e8\uc704 \uba74\uc801\ub2f9 \uc791\uc6a9\ud558\ub294 \ud798\uc774\ub2e4.<\/p>\n\n\n\n

P = F\/A<\/code><\/p>\n\n\n\n

P -> \uc555\ub825<\/code><\/p>\n\n\n\n

F -> \ud798<\/code><\/p>\n\n\n\n

A -> \uba74\uc801<\/code><\/p>\n\n\n\n

\uc774\ub2e4.<\/p>\n\n\n\n

\ub2e8\uc704\ub294 \ud30c\uc2a4\uce7c(Pa)\uc774\ub2e4.<\/p>\n\n\n\n

1 Pa = 1 N\/m\u00b2<\/code><\/p>\n\n\n\n

\uac19\uc740 \ud798\uc774\ub77c\ub3c4 \uc791\uc6a9 \uba74\uc801\uc774 \uc791\uc73c\uba74 \uc555\ub825\uc774 \ucee4\uc9c4\ub2e4.<\/p>\n\n\n\n

\uba74\uc801 \uac10\uc18c -> \uc555\ub825 \uc99d\uac00<\/code><\/p>\n\n\n\n

\uc720\uccb4\uc5d0\uc11c\ub294 \uc555\ub825\uc774 \ubaa8\ub4e0 \ubc29\ud5a5\uc73c\ub85c \uc804\ub2ec\ub41c\ub2e4.<\/p>\n\n\n\n

\uc815\uc9c0\ud55c \uc720\uccb4\uc5d0\uc11c \uae4a\uc774\uc5d0 \ub530\ub978 \uc555\ub825\uc740<\/p>\n\n\n\n

P = P_0 + \u03c1gh<\/code><\/p>\n\n\n\n

\ub85c \ud45c\ud604\ud560 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n

P_0 -> \ud45c\uba74 \uc555\ub825<\/code><\/p>\n\n\n\n

\u03c1 -> \uc720\uccb4 \ubc00\ub3c4<\/code><\/p>\n\n\n\n

g -> \uc911\ub825 \uac00\uc18d\ub3c4<\/code><\/p>\n\n\n\n

h -> \uae4a\uc774<\/code><\/p>\n\n\n\n

\uc774\ub2e4.<\/p>\n\n\n\n

\ub530\ub77c\uc11c<\/p>\n\n\n\n

\uae4a\uc774 \uc99d\uac00 -> \uc555\ub825 \uc99d\uac00<\/code><\/p>\n\n\n\n

\ud55c\ub2e4.<\/p>\n\n\n\n

\n\n\n\n

\ubd80\ub825<\/h2>\n\n\n\n

\ubd80\ub825(Buoyant Force)<\/strong>\uc740 \uc720\uccb4 \uc18d\uc5d0 \ub4e4\uc5b4\uac04 \ubb3c\uccb4\uac00 \uc720\uccb4\ub85c\ubd80\ud130 \ubc1b\ub294 \uc704\ucabd \ubc29\ud5a5\uc758 \ud798\uc774\ub2e4.<\/p>\n\n\n\n

\uc544\ub974\ud0a4\uba54\ub370\uc2a4 \uc6d0\ub9ac\uc5d0 \ub530\ub974\uba74 \ubd80\ub825\uc740 \ubb3c\uccb4\uac00 \ubc00\uc5b4\ub0b8 \uc720\uccb4\uc758 \ubb34\uac8c\uc640 \uac19\ub2e4.<\/p>\n\n\n\n

F_b = \u03c1_fluid g V_displaced<\/code><\/p>\n\n\n\n

\uc774\ub2e4.<\/p>\n\n\n\n

\u03c1_fluid -> \uc720\uccb4 \ubc00\ub3c4<\/code><\/p>\n\n\n\n

V_displaced -> \ubb3c\uccb4\uac00 \ubc00\uc5b4\ub0b8 \uc720\uccb4\uc758 \ubd80\ud53c<\/code><\/p>\n\n\n\n

\uc774\ub2e4.<\/p>\n\n\n\n

\ubb3c\uccb4\uc758 \ud3c9\uade0 \ubc00\ub3c4\uc640 \uc720\uccb4\uc758 \ubc00\ub3c4\ub97c \ube44\uad50\ud558\uba74 \ub300\ub7b5\uc801\uc778 \uc0c1\ud0dc\ub97c \ud310\ub2e8\ud560 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n

\u03c1_object > \u03c1_fluid -> \uac00\ub77c\uc549\uc74c<\/code><\/p>\n\n\n\n

\u03c1_object < \u03c1_fluid -> \ub738<\/code><\/p>\n\n\n\n

\u03c1_object = \u03c1_fluid -> \uc911\uc131 \ubd80\ub825<\/code><\/p>\n\n\n\n

\ub2e8, \ub5a0 \uc788\ub294 \ubb3c\uccb4\ub294 \ubb3c\uccb4 \uc804\uccb4\uac00 \uc720\uccb4\uc5d0 \uc7a0\uae30\ub294 \uac83\uc774 \uc544\ub2c8\ub77c \uc77c\ubd80\ub9cc \uc7a0\uaca8 \ubd80\ub825\uacfc \uc911\ub825\uc774 \ud3c9\ud615\uc744 \uc774\ub8ec\ub2e4.<\/p>\n\n\n\n

\ubd80\ub825 = \uc911\ub825 -> \ud3c9\ud615<\/code><\/p>\n\n\n\n

\n\n\n\n

\uc810\uc131<\/h2>\n\n\n\n

\uc810\uc131(Viscosity)<\/strong>\uc740 \uc720\uccb4\uac00 \ud750\ub984\uc5d0 \uc800\ud56d\ud558\ub294 \uc131\uc9c8\uc774\ub2e4.<\/p>\n\n\n\n

\uc27d\uac8c \ub9d0\ud558\uba74 \uc720\uccb4 \ub0b4\ubd80\uc758 \uce35\uacfc \uce35 \uc0ac\uc774\uc5d0\uc11c \ubc1c\uc0dd\ud558\ub294 \ub9c8\ucc30\uacfc \ube44\uc2b7\ud55c \uc131\uc9c8\uc774\ub2e4.<\/p>\n\n\n\n

\uc810\uc131\uc774 \ub0ae\uc73c\uba74 \uc27d\uac8c \ud750\ub974\uace0,<\/p>\n\n\n\n

\uc810\uc131\uc774 \ub192\uc73c\uba74 \ud750\ub974\uae30 \uc5b4\ub835\ub2e4.<\/p>\n\n\n\n

\uc608\ub97c \ub4e4\uc5b4<\/p>\n\n\n\n

\ubb3c -> \ub0ae\uc740 \uc810\uc131<\/code><\/p>\n\n\n\n

\uafc0 -> \ub192\uc740 \uc810\uc131<\/code><\/p>\n\n\n\n

\uc73c\ub85c \ubcfc \uc218 \uc788\ub2e4.<\/p>\n\n\n\n

\uc810\uc131\uc774 \ub192\uc744\uc218\ub85d \uc720\uccb4 \ub0b4\ubd80\uc758 \uc18d\ub3c4 \ucc28\uc774\ub97c \uc904\uc774\ub824\ub294 \ud6a8\uacfc\uac00 \uac15\ud574\uc9c4\ub2e4.<\/p>\n\n\n\n

\uac8c\uc784\uc5d0\uc11c\ub294 \uc810\uc131\uc744 \uc9c1\uc811 \uacc4\uc0b0\ud558\uae30\ubcf4\ub2e4<\/p>\n\n\n\n

\uc810\uc131 \uc99d\uac00 -> \uc6c0\uc9c1\uc784 \uc800\ud56d \uc99d\uac00<\/code><\/p>\n\n\n\n

\ud615\ud0dc\ub85c \ub2e8\uc21c\ud654\ud558\ub294 \uacbd\uc6b0\uac00 \ub9ce\ub2e4.<\/p>\n\n\n\n

\n\n\n\n

\uc720\uccb4 \ud750\ub984<\/h2>\n\n\n\n

\uc720\uccb4 \ud750\ub984\uc740 \uc720\uccb4 \uc785\uc790\ub4e4\uc774 \uacf5\uac04\uc744 \ud1b5\ud574 \uc774\ub3d9\ud558\ub294 \ud604\uc0c1\uc774\ub2e4.<\/p>\n\n\n\n

\ud750\ub984\uc744 \ubd84\uc11d\ud560 \ub54c \uc720\uccb4\uc758<\/p>\n\n\n\n

\uc18d\ub3c4<\/code><\/p>\n\n\n\n

\uc555\ub825<\/code><\/p>\n\n\n\n

\ubc00\ub3c4<\/code><\/p>\n\n\n\n

\uc810\uc131<\/code><\/p>\n\n\n\n

\ub4f1\uc744 \uace0\ub824\ud55c\ub2e4.<\/p>\n\n\n\n

\ub300\ud45c\uc801\uc778 \ud750\ub984 \ud615\ud0dc\ub294 \uce35\ub958\uc640 \ub09c\ub958<\/strong>\ub2e4.<\/p>\n\n\n\n

\uce35\ub958<\/h3>\n\n\n\n

\uc720\uccb4\uac00 \ube44\uad50\uc801 \uaddc\uce59\uc801\uc778 \uce35\uc744 \uc774\ub8e8\uba70 \ud750\ub978\ub2e4.<\/p>\n\n\n\n

\uaddc\uce59\uc801\uc778 \ud750\ub984 -> \uce35\ub958<\/code><\/p>\n\n\n\n

\uc810\uc131\uc774 \ub192\uac70\ub098 \ud750\ub984 \uc18d\ub3c4\uac00 \ub0ae\uc744 \ub54c \ub098\ud0c0\ub098\uae30 \uc27d\ub2e4.<\/p>\n\n\n\n

\ub09c\ub958<\/h3>\n\n\n\n

\uc720\uccb4\uac00 \ubd88\uaddc\uce59\ud558\uac8c \uc11e\uc774\uba70 \ubcf5\uc7a1\ud558\uac8c \ud750\ub978\ub2e4.<\/p>\n\n\n\n

\ubd88\uaddc\uce59\ud55c \ud750\ub984 -> \ub09c\ub958<\/code><\/p>\n\n\n\n

\uc18d\ub3c4\uac00 \ub192\uac70\ub098 \ubb3c\uccb4\uc758 \ud615\uc0c1\uacfc \uc720\uccb4 \uc870\uac74\uc5d0 \ub530\ub77c \ub09c\ub958\uac00 \ubc1c\uc0dd\ud558\uae30 \uc27d\ub2e4.<\/p>\n\n\n\n

\n\n\n\n

\ub808\uc774\ub180\uc988 \uc218<\/h2>\n\n\n\n

\uce35\ub958\uc640 \ub09c\ub958\ub97c \ud310\ub2e8\ud560 \ub54c \ub300\ud45c\uc801\uc73c\ub85c \ub808\uc774\ub180\uc988 \uc218(Reynolds Number)<\/strong>\ub97c \uc0ac\uc6a9\ud55c\ub2e4.<\/p>\n\n\n\n

Re = \u03c1vL\/\u03bc<\/code><\/p>\n\n\n\n

\ub610\ub294 \ub3d9\uc810\uc131\uacc4\uc218 \u03bd<\/code>\ub97c \uc0ac\uc6a9\ud558\uba74<\/p>\n\n\n\n

Re = vL\/\u03bd<\/code><\/p>\n\n\n\n

\uc774\ub2e4.<\/p>\n\n\n\n

\u03c1 -> \ubc00\ub3c4<\/code><\/p>\n\n\n\n

v -> \uc720\uccb4 \uc18d\ub3c4<\/code><\/p>\n\n\n\n

L -> \ub300\ud45c \uae38\uc774<\/code><\/p>\n\n\n\n

\u03bc -> \ub3d9\uc810\uc131\uacc4\uc218<\/code><\/p>\n\n\n\n

\uc774\ub2e4.<\/p>\n\n\n\n

\ub808\uc774\ub180\uc988 \uc218\uac00 \ub0ae\uc73c\uba74 \uc810\uc131 \ud6a8\uacfc\uac00 \uc0c1\ub300\uc801\uc73c\ub85c \ud06c\uace0, \ub192\uc73c\uba74 \uad00\uc131 \ud6a8\uacfc\uac00 \uc0c1\ub300\uc801\uc73c\ub85c \ud06c\ub2e4.<\/p>\n\n\n\n

\uc77c\ubc18\uc801\uc778 \ud750\ub984\uc5d0\uc11c\ub294<\/p>\n\n\n\n

\ub0ae\uc740 Re -> \uce35\ub958 \uacbd\ud5a5<\/code><\/p>\n\n\n\n

\ub192\uc740 Re -> \ub09c\ub958 \uacbd\ud5a5<\/code><\/p>\n\n\n\n

\uc73c\ub85c \uc774\ud574\ud560 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n

\ub2e4\ub9cc \uc2e4\uc81c \uc804\uc774 \uae30\uc900\uc740 \uc720\ub3d9 \uc870\uac74\uacfc \ud615\uc0c1\uc5d0 \ub530\ub77c \ub2ec\ub77c\uc9c4\ub2e4.<\/p>\n\n\n\n

\n\n\n\n

\uc720\uccb4 \uc800\ud56d<\/h2>\n\n\n\n

\ubb3c\uccb4\uac00 \uc720\uccb4 \uc18d\uc744 \uc6c0\uc9c1\uc774\uba74 \uc720\uccb4\ub294 \ubb3c\uccb4\uc758 \uc6b4\ub3d9\uc744 \ubc29\ud574\ud55c\ub2e4.<\/p>\n\n\n\n

\uc774\ub97c \uc77c\ubc18\uc801\uc73c\ub85c \uc720\uccb4 \uc800\ud56d(Fluid Resistance)<\/strong>\uc774\ub77c\uace0 \ud55c\ub2e4.<\/p>\n\n\n\n

\uad6c\uc870\ub294<\/p>\n\n\n\n

\ubb3c\uccb4 \uc6b4\ub3d9 -> \uc720\uccb4\uc640 \uc0c1\ub300 \uc6b4\ub3d9 -> \uc800\ud56d\ub825<\/code><\/p>\n\n\n\n

\uc774\ub2e4.<\/p>\n\n\n\n

\uc800\ud56d\ub825\uc758 \ubc29\ud5a5\uc740 \uc77c\ubc18\uc801\uc73c\ub85c \uc0c1\ub300 \uc6b4\ub3d9 \ubc29\ud5a5\uc758 \ubc18\ub300\ub2e4.<\/p>\n\n\n\n

v > 0 -> F_drag < 0<\/code><\/p>\n\n\n\n

v < 0 -> F_drag > 0<\/code><\/p>\n\n\n\n

\ub530\ub77c\uc11c<\/p>\n\n\n\n

\uc800\ud56d\ub825 -> \uc6b4\ub3d9 \ubc29\ud5a5 \ubc18\ub300<\/code><\/p>\n\n\n\n

\ub77c\uace0 \ubcfc \uc218 \uc788\ub2e4.<\/p>\n\n\n\n

\n\n\n\n

\uacf5\uae30 \uc800\ud56d<\/h2>\n\n\n\n

\uacf5\uae30 \uc800\ud56d\uc740 \uacf5\uae30 \uc911\uc5d0\uc11c \uc6c0\uc9c1\uc774\ub294 \ubb3c\uccb4\uac00 \ubc1b\ub294 \uc800\ud56d\ub825\uc774\ub2e4.<\/p>\n\n\n\n

\uc800\uc18d\uc5d0\uc11c\ub294 \ub2e8\uc21c\ud654\ud574\uc11c \uc18d\ub3c4\uc5d0 \ube44\ub840\ud558\ub294 \ubaa8\ub378\uc744 \uc0ac\uc6a9\ud560 \uc218\ub3c4 \uc788\ub2e4.<\/p>\n\n\n\n

F_drag = -cv<\/code><\/p>\n\n\n\n

\ud558\uc9c0\ub9cc \uc77c\ubc18\uc801\uc778 \uace0\uc18d \uc6b4\ub3d9\uc5d0\uc11c\ub294 \ud56d\ub825\uc744 \uc18d\ub3c4\uc758 \uc81c\uacf1\uc5d0 \ube44\ub840\ud558\ub294 \ud615\ud0dc\ub85c \uadfc\uc0ac\ud558\ub294 \uacbd\uc6b0\uac00 \ub9ce\ub2e4.<\/p>\n\n\n\n

F_drag = 1\/2 \u03c1 C_d A v\u00b2<\/code><\/p>\n\n\n\n

\uc774\ub2e4.<\/p>\n\n\n\n

\u03c1 -> \uacf5\uae30 \ubc00\ub3c4<\/code><\/p>\n\n\n\n

C_d -> \ud56d\ub825 \uacc4\uc218<\/code><\/p>\n\n\n\n

A -> \uae30\uc900 \uba74\uc801<\/code><\/p>\n\n\n\n

v -> \ubb3c\uccb4\uc640 \uacf5\uae30\uc758 \uc0c1\ub300 \uc18d\ub3c4<\/code><\/p>\n\n\n\n

\uc774\ub2e4.<\/p>\n\n\n\n

\ubc29\ud5a5\uae4c\uc9c0 \ud3ec\ud568\ud558\uba74 \uc800\ud56d\ub825\uc740 \uc18d\ub3c4\uc640 \ubc18\ub300 \ubc29\ud5a5\uc73c\ub85c \uc801\uc6a9\ud55c\ub2e4.<\/p>\n\n\n\n

F_drag = -1\/2 \u03c1 C_d A |v|v<\/code><\/p>\n\n\n\n

\ud615\ud0dc\ub85c \ud45c\ud604\ud560 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n

\n\n\n\n

\ud56d\ub825<\/h2>\n\n\n\n

\ud56d\ub825(Drag Force)<\/strong>\uc740 \uc720\uccb4 \uc18d\uc5d0\uc11c \uc6c0\uc9c1\uc774\ub294 \ubb3c\uccb4\uac00 \uc720\uccb4\ub85c\ubd80\ud130 \ubc1b\ub294 \uc6b4\ub3d9 \uc800\ud56d\ub825\uc774\ub2e4.<\/p>\n\n\n\n

\ud575\uc2ec \uc694\uc18c\ub294<\/p>\n\n\n\n

\uc720\uccb4 \ubc00\ub3c4<\/code><\/p>\n\n\n\n

\uc0c1\ub300 \uc18d\ub3c4<\/code><\/p>\n\n\n\n

\ubb3c\uccb4\uc758 \uae30\uc900 \uba74\uc801<\/code><\/p>\n\n\n\n

\ubb3c\uccb4 \ud615\uc0c1<\/code><\/p>\n\n\n\n

\uc774\ub2e4.<\/p>\n\n\n\n

\ub300\ud45c\uc801\uc778 \ud56d\ub825 \uacf5\uc2dd\uc740<\/p>\n\n\n\n

F_d = 1\/2\u03c1C_dAv\u00b2<\/code><\/p>\n\n\n\n

\uc774\ub2e4.<\/p>\n\n\n\n

\uc5ec\uae30\uc11c \uc911\uc694\ud55c \uac83\uc740 \uc18d\ub3c4\uac00 \uc81c\uacf1\uc73c\ub85c \ub4e4\uc5b4\uac04\ub2e4\ub294 \uac83\uc774\ub2e4.<\/p>\n\n\n\n

\uc18d\ub3c4 2\ubc30 -> \ud56d\ub825 4\ubc30<\/code><\/p>\n\n\n\n

\uc18d\ub3c4 3\ubc30 -> \ud56d\ub825 9\ubc30<\/code><\/p>\n\n\n\n

\uac00 \ub41c\ub2e4.<\/p>\n\n\n\n

\ub530\ub77c\uc11c \ube60\ub974\uac8c \uc6c0\uc9c1\uc77c\uc218\ub85d \uacf5\uae30 \uc800\ud56d\uc758 \uc601\ud5a5\uc774 \uae09\uaca9\ud558\uac8c \ucee4\uc9c4\ub2e4.<\/p>\n\n\n\n

\n\n\n\n

Drag Coefficient<\/h2>\n\n\n\n

Drag Coefficient(\ud56d\ub825 \uacc4\uc218)<\/strong> C_d<\/code>\ub294 \ubb3c\uccb4\uc758 \ud615\uc0c1\uacfc \uc720\ub3d9 \uc870\uac74\uc5d0 \ub530\ub978 \ud56d\ub825 \ud2b9\uc131\uc744 \ub098\ud0c0\ub0b4\ub294 \ubb34\ucc28\uc6d0 \uacc4\uc218\ub2e4.<\/p>\n\n\n\n

\ud56d\ub825\uc740<\/p>\n\n\n\n

F_d = 1\/2\u03c1C_dAv\u00b2<\/code><\/p>\n\n\n\n

\uc774\ubbc0\ub85c<\/p>\n\n\n\n

C_d \uc99d\uac00 -> \ud56d\ub825 \uc99d\uac00<\/code><\/p>\n\n\n\n

\ud55c\ub2e4.<\/p>\n\n\n\n

\uac19\uc740 \uba74\uc801, \uac19\uc740 \uc18d\ub3c4, \uac19\uc740 \uacf5\uae30 \ubc00\ub3c4\ub77c\ub3c4 \ubb3c\uccb4\uc758 \ud615\uc0c1\uc5d0 \ub530\ub77c \ud56d\ub825\uc774 \ub2ec\ub77c\uc9c8 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n

\uc608\ub97c \ub4e4\uc5b4<\/p>\n\n\n\n

\uc720\uc120\ud615 \ubb3c\uccb4 -> \uc0c1\ub300\uc801\uc73c\ub85c \ub0ae\uc740 C_d<\/code><\/p>\n\n\n\n

\ub454\ud55c \ud615\uc0c1\uc758 \ubb3c\uccb4 -> \uc0c1\ub300\uc801\uc73c\ub85c \ub192\uc740 C_d<\/code><\/p>\n\n\n\n

\ub85c \uc0dd\uac01\ud560 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n

\uc2e4\uc81c C_d<\/code>\ub294 \uace0\uc815\ub41c \ubb3c\uccb4 \uace0\uc720 \uc0c1\uc218\uac00 \uc544\ub2c8\ub77c \ub808\uc774\ub180\uc988 \uc218, \ub9c8\ud558 \uc218, \uc790\uc138, \ud45c\uba74 \ud2b9\uc131 \ub4f1\uc758 \uc601\ud5a5\uc744 \ubc1b\uc744 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n

\uac8c\uc784\uc5d0\uc11c\ub294 \ubb3c\uccb4\uc758 \ud615\ud0dc\ub97c \uc9c1\uc811 \uc720\uccb4\uc5ed\ud559\uc801\uc73c\ub85c \uacc4\uc0b0\ud558\ub294 \ub300\uc2e0<\/p>\n\n\n\n

C_d -> \ubb3c\uccb4\ubcc4 \uc800\ud56d \ud2b9\uc131\uc744 \uc870\uc808\ud558\ub294 \ud30c\ub77c\ubbf8\ud130<\/code><\/p>\n\n\n\n

\ub85c \uc0ac\uc6a9\ud558\ub294 \uacbd\uc6b0\uac00 \ub9ce\ub2e4.<\/p>\n\n\n\n

\n\n\n\n

\uc885\ub2e8 \uc18d\ub3c4<\/h2>\n\n\n\n

\ubb3c\uccb4\uac00 \uacf5\uae30 \uc911\uc5d0\uc11c \ub099\ud558\ud558\uba74 \ucc98\uc74c\uc5d0\ub294 \uc911\ub825\uc774 \ubb3c\uccb4\ub97c \uac00\uc18d\ud55c\ub2e4.<\/p>\n\n\n\n

\ud558\uc9c0\ub9cc \uc18d\ub3c4\uac00 \uc99d\uac00\ud558\uba74 \uacf5\uae30 \uc800\ud56d\ub3c4 \uc99d\uac00\ud55c\ub2e4.<\/p>\n\n\n\n

\uc18d\ub3c4 \uc99d\uac00 -> \ud56d\ub825 \uc99d\uac00<\/code><\/p>\n\n\n\n

\uacb0\uad6d \uc5b4\ub290 \uc21c\uac04<\/p>\n\n\n\n

\uc911\ub825 = \ud56d\ub825<\/code><\/p>\n\n\n\n

\uc774 \ub418\ub294 \uc0c1\ud0dc\uc5d0 \uc811\uadfc\ud55c\ub2e4.<\/p>\n\n\n\n

\uadf8\ub7ec\uba74 \uc54c\uc9dc\ud798\uc774 0\uc774 \ub418\uc5b4 \uac00\uc18d\ub3c4\uac00 0\uc774 \ub41c\ub2e4.<\/p>\n\n\n\n

F_net = mg - F_d = 0<\/code><\/p>\n\n\n\n

\ub530\ub77c\uc11c<\/p>\n\n\n\n

a = 0<\/code><\/p>\n\n\n\n

\uc774\uace0 \uc18d\ub3c4\ub294 \ub354 \uc774\uc0c1 \uc99d\uac00\ud558\uc9c0 \uc54a\ub294\ub2e4.<\/p>\n\n\n\n

\uc774\ub54c\uc758 \uc18d\ub3c4\ub97c \uc885\ub2e8 \uc18d\ub3c4(Terminal Velocity)<\/strong>\ub77c\uace0 \ud55c\ub2e4.<\/p>\n\n\n\n

\n\n\n\n

\uc885\ub2e8 \uc18d\ub3c4\uc640 \ud56d\ub825<\/h2>\n\n\n\n

\uc81c\uacf1 \ud56d\ub825 \ubaa8\ub378\uc744 \uc0ac\uc6a9\ud558\uba74 \uc885\ub2e8 \uc18d\ub3c4\uc5d0\uc11c\ub294<\/p>\n\n\n\n

mg = 1\/2\u03c1C_dAv_t\u00b2<\/code><\/p>\n\n\n\n

\uc774\ub2e4.<\/p>\n\n\n\n

\uc774\ub97c \uc815\ub9ac\ud558\uba74<\/p>\n\n\n\n

v_t = sqrt(2mg \/ \u03c1C_dA)<\/code><\/p>\n\n\n\n

\uc774\ub2e4.<\/p>\n\n\n\n

\ub530\ub77c\uc11c<\/p>\n\n\n\n

\uc9c8\ub7c9 \uc99d\uac00 -> \uc885\ub2e8 \uc18d\ub3c4 \uc99d\uac00<\/code><\/p>\n\n\n\n

\uacf5\uae30 \ubc00\ub3c4 \uc99d\uac00 -> \uc885\ub2e8 \uc18d\ub3c4 \uac10\uc18c<\/code><\/p>\n\n\n\n

\ud56d\ub825 \uacc4\uc218 \uc99d\uac00 -> \uc885\ub2e8 \uc18d\ub3c4 \uac10\uc18c<\/code><\/p>\n\n\n\n

\ub2e8\uba74\uc801 \uc99d\uac00 -> \uc885\ub2e8 \uc18d\ub3c4 \uac10\uc18c<\/code><\/p>\n\n\n\n

\ud55c\ub2e4.<\/p>\n\n\n\n

\n\n\n\n

\uc720\uccb4 \uc800\ud56d\uc758 \ubaa8\ub378<\/h2>\n\n\n\n

\uac8c\uc784\uc5d0\uc11c\ub294 \uc0c1\ud669\uc5d0 \ub530\ub77c \uc800\ud56d \ubaa8\ub378\uc744 \ub2e8\uc21c\ud654\ud560 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n

\uc120\ud615 \uc800\ud56d<\/h3>\n\n\n\n

F_drag = -cv<\/code><\/p>\n\n\n\n

\uc18d\ub3c4\uc5d0 \ube44\ub840\ud55c\ub2e4.<\/p>\n\n\n\n

\uacc4\uc0b0\uc774 \uac04\ub2e8\ud558\uace0 \uc791\uc740 \uc18d\ub3c4 \uc601\uc5ed\uc758 \uadfc\uc0ac\ub098 \uac8c\uc784\ud50c\ub808\uc774\uc6a9 \ubb3c\ub9ac\uc5d0 \uc801\ud569\ud558\ub2e4.<\/p>\n\n\n\n

\uc81c\uacf1 \uc800\ud56d<\/h3>\n\n\n\n

F_drag = -kv|v|<\/code><\/p>\n\n\n\n

\ub610\ub294<\/p>\n\n\n\n

F_drag = -1\/2\u03c1C_dA|v|v<\/code><\/p>\n\n\n\n

\uc18d\ub3c4\uc758 \uc81c\uacf1\uc5d0 \ube44\ub840\ud55c\ub2e4.<\/p>\n\n\n\n

\uc2e4\uc81c \uacf5\uae30 \uc800\ud56d\uc744 \uadfc\uc0ac\ud560 \ub54c \uc77c\ubc18\uc801\uc73c\ub85c \ub354 \uc801\ud569\ud558\ub2e4.<\/p>\n\n\n\n

\ub450 \ubaa8\ub378\uc758 \ucc28\uc774\ub294<\/p>\n\n\n\n

\uc120\ud615 \uc800\ud56d -> \uc18d\ub3c4 \uc99d\uac00\uc5d0 \ube44\ub840\ud558\uc5ec \uc800\ud56d \uc99d\uac00<\/code><\/p>\n\n\n\n

\uc81c\uacf1 \uc800\ud56d -> \uc18d\ub3c4 \uc99d\uac00\uc5d0 \ub530\ub77c \uc800\ud56d\uc774 \ud6e8\uc52c \ube60\ub974\uac8c \uc99d\uac00<\/code><\/p>\n\n\n\n

\uc774\ub2e4.<\/p>\n\n\n\n

\n\n\n\n

\ubb3c\uc18d\uc5d0\uc11c\uc758 \uc800\ud56d<\/h2>\n\n\n\n

\ubb3c\uc740 \uacf5\uae30\ubcf4\ub2e4 \ubc00\ub3c4\uac00 \ud6e8\uc52c \ub192\uae30 \ub54c\ubb38\uc5d0 \uac19\uc740 \uc870\uac74\uc774\ub77c\uba74 \ubb3c\uc18d\uc5d0\uc11c \ud56d\ub825\uc774 \ud6e8\uc52c \ud06c\uac8c \ubc1c\uc0dd\ud55c\ub2e4.<\/p>\n\n\n\n

F_d = 1\/2\u03c1C_dAv\u00b2<\/code><\/p>\n\n\n\n

\uc5d0\uc11c<\/p>\n\n\n\n

\u03c1_water >> \u03c1_air<\/code><\/p>\n\n\n\n

\uc774\uae30 \ub54c\ubb38\uc774\ub2e4.<\/p>\n\n\n\n

\ub530\ub77c\uc11c \uac8c\uc784\uc5d0\uc11c\ub294<\/p>\n\n\n\n

\uacf5\uae30 -> \ub0ae\uc740 \uc800\ud56d<\/code><\/p>\n\n\n\n

\ubb3c -> \ub192\uc740 \uc800\ud56d<\/code><\/p>\n\n\n\n

\uc73c\ub85c \uc124\uc815\ud558\uc5ec \ubb3c\uc18d \uc6c0\uc9c1\uc784\uc744 \ud45c\ud604\ud560 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n

\ubb3c\uc18d\uc5d0\uc11c\ub294 \ud56d\ub825\ubfd0\ub9cc \uc544\ub2c8\ub77c \ubd80\ub825<\/strong>\ub3c4 \ud568\uaed8 \uace0\ub824\ud574\uc57c \ud55c\ub2e4.<\/p>\n\n\n\n

\ubb3c\uc18d \uc6b4\ub3d9 -> \uc911\ub825 + \ubd80\ub825 + \ud56d\ub825<\/code><\/p>\n\n\n\n

\n\n\n\n

\uac8c\uc784 \ubb3c\ub9ac\uc5d0\uc11c\uc758 \uc801\uc6a9<\/h2>\n\n\n\n

\uac8c\uc784\uc5d0\uc11c \uc2e4\uc81c \uc720\uccb4\uc5ed\ud559\uc744 \uadf8\ub300\ub85c \uad6c\ud604\ud558\ub294 \uacbd\uc6b0\ub294 \ub4dc\ubb3c\ub2e4.<\/p>\n\n\n\n

\ub300\ubd80\ubd84 \ubaa9\uc801\uc5d0 \ub9de\uac8c \ub2e8\uc21c\ud654\ud55c\ub2e4.<\/p>\n\n\n\n

\uc608\ub97c \ub4e4\uc5b4 \ubb3c\uc18d \uce90\ub9ad\ud130\ub77c\uba74<\/p>\n\n\n\n

\uc911\ub825 -> \uc544\ub798 \ubc29\ud5a5 \ud798<\/code><\/p>\n\n\n\n

\ubd80\ub825 -> \uc704 \ubc29\ud5a5 \ud798<\/code><\/p>\n\n\n\n

\ud56d\ub825 -> \uc774\ub3d9 \ubc18\ub300 \ubc29\ud5a5 \ud798<\/code><\/p>\n\n\n\n

\uc744 \uc801\uc6a9\ud560 \uc218 \uc788\ub2e4.<\/p>\n\n\n\n

\uc774\ub97c \ud569\uce58\uba74<\/p>\n\n\n\n

F_net = F_gravity + F_buoyancy + F_drag<\/code><\/p>\n\n\n\n

\uac00 \ub41c\ub2e4.<\/p>\n\n\n\n

\uadf8\ub9ac\uace0 \ub274\ud134\uc758 \uc81c2\ubc95\uce59\uc73c\ub85c<\/p>\n\n\n\n

a = F_net\/m<\/code><\/p>\n\n\n\n

\uc744 \uacc4\uc0b0\ud55c\ub2e4.<\/p>\n\n\n\n

\uacf5\uae30 \uc800\ud56d\uc744 \uad6c\ud604\ud55c\ub2e4\uba74<\/p>\n\n\n\n

\uc0c1\ub300 \uc18d\ub3c4 -> \ud56d\ub825 \uacc4\uc0b0 -> \uc6b4\ub3d9 \ubc18\ub300 \ubc29\ud5a5\uc73c\ub85c \uc801\uc6a9<\/code><\/p>\n\n\n\n

\ud558\ub294 \uad6c\uc870\uac00 \uae30\ubcf8\uc774\ub2e4.<\/p>\n\n\n\n

\n\n\n\n

\ud575\uc2ec \uc815\ub9ac<\/h2>\n\n\n\n

\ubc00\ub3c4 -> \u03c1 = m\/V<\/code><\/p>\n\n\n\n

\uc555\ub825 -> P = F\/A<\/code><\/p>\n\n\n\n

\uc815\uc9c0 \uc720\uccb4\uc758 \uc555\ub825 -> P = P_0 + \u03c1gh<\/code><\/p>\n\n\n\n

\ubd80\ub825 -> F_b = \u03c1_fluid gV_displaced<\/code><\/p>\n\n\n\n

\uc810\uc131 -> \uc720\uccb4\uc758 \ud750\ub984\uc5d0 \ub300\ud55c \ub0b4\ubd80 \uc800\ud56d<\/code><\/p>\n\n\n\n

\uce35\ub958 -> \uaddc\uce59\uc801\uc778 \uc720\uccb4 \ud750\ub984<\/code><\/p>\n\n\n\n

\ub09c\ub958 -> \ubd88\uaddc\uce59\ud558\uace0 \ubcf5\uc7a1\ud55c \uc720\uccb4 \ud750\ub984<\/code><\/p>\n\n\n\n

\ub808\uc774\ub180\uc988 \uc218 -> Re = \u03c1vL\/\u03bc<\/code><\/p>\n\n\n\n

\uc720\uccb4 \uc800\ud56d -> \uc720\uccb4\uac00 \ubb3c\uccb4\uc758 \uc6b4\ub3d9\uc744 \ubc29\ud574\ud558\ub294 \ud6a8\uacfc<\/code><\/p>\n\n\n\n

\ud56d\ub825 -> \uc720\uccb4 \uc18d \ubb3c\uccb4\uc758 \uc6b4\ub3d9\uc744 \ubc29\ud574\ud558\ub294 \ud798<\/code><\/p>\n\n\n\n

\ud56d\ub825 -> F_d = 1\/2\u03c1C_dAv\u00b2<\/code><\/p>\n\n\n\n

Drag Coefficient -> C_d<\/code><\/p>\n\n\n\n

\uc18d\ub3c4 \uc99d\uac00 -> \ud56d\ub825 \uae09\uaca9\ud788 \uc99d\uac00<\/code><\/p>\n\n\n\n

\uc18d\ub3c4 2\ubc30 -> \uc81c\uacf1 \ud56d\ub825 4\ubc30<\/code><\/p>\n\n\n\n

\uc885\ub2e8 \uc18d\ub3c4 -> \uc911\ub825\uacfc \ud56d\ub825\uc774 \ud3c9\ud615\uc744 \uc774\ub8e8\ub294 \uc18d\ub3c4<\/code><\/p>\n\n\n\n

\uc885\ub2e8 \uc18d\ub3c4 -> v_t = sqrt(2mg\/\u03c1C_dA)<\/code><\/p>\n\n\n\n

\uc804\uccb4 \uad6c\uc870\ub294 \ub2e4\uc74c\uacfc \uac19\uc774 \uc7a1\uc73c\uba74 \ub41c\ub2e4.<\/p>\n\n\n\n

\uc720\uccb4 -> \ubc00\ub3c4 \/ \uc555\ub825 \/ \uc810\uc131 \/ \ud750\ub984<\/code><\/p>\n\n\n\n

\uc720\uccb4 + \ubb3c\uccb4 -> \ubd80\ub825 \/ \ud56d\ub825<\/code><\/p>\n\n\n\n

\uc0c1\ub300 \uc18d\ub3c4 -> \uc720\uccb4 \uc800\ud56d<\/code><\/p>\n\n\n\n

\uc0c1\ub300 \uc18d\ub3c4 \uc99d\uac00 -> \ud56d\ub825 \uc99d\uac00<\/code><\/p>\n\n\n\n

\ud56d\ub825 \uc99d\uac00 -> \uac00\uc18d\ub3c4 \uac10\uc18c<\/code><\/p>\n\n\n\n

\uc911\ub825 + \ud56d\ub825 -> \uc885\ub2e8 \uc18d\ub3c4<\/code><\/p>\n\n\n\n

\ubb3c\uc18d \uc6b4\ub3d9 -> \uc911\ub825 + \ubd80\ub825 + \ud56d\ub825<\/code><\/p>\n\n\n\n

\uacb0\uad6d \uc720\uccb4 \ubb3c\ub9ac\uc758 \ud575\uc2ec\uc740 \uc720\uccb4\uc758 \ubc00\ub3c4\uc640 \uc810\uc131, \ubb3c\uccb4\uc640 \uc720\uccb4 \uc0ac\uc774\uc758 \uc0c1\ub300 \uc6b4\ub3d9\uc774 \ubb3c\uccb4\uc5d0 \ud798\uc744 \ub9cc\ub4e4\uc5b4\ub0b8\ub2e4\ub294 \uac83<\/strong>\uc774\ub2e4. \uac8c\uc784 \ubb3c\ub9ac\uc5d0\uc11c\ub294 \uc774 \uad00\uacc4\ub97c \ubaa9\uc801\uc5d0 \ub9de\uac8c \ub2e8\uc21c\ud654\ud558\uc5ec \ubd80\ub825\uacfc \ud56d\ub825, \uc800\ud56d \uacc4\uc218 \ub4f1\uc744 \uc870\uc808\ud558\ub294 \ubc29\uc2dd\uc73c\ub85c \uad6c\ud604\ud558\uba74 \ub41c\ub2e4.<\/p>\n","protected":false},"excerpt":{"rendered":"

\uc720\uccb4(Fluid)\ub294 \uace0\uccb4\ucc98\ub7fc \uc77c\uc815\ud55c \ud615\ud0dc\ub97c \uc720\uc9c0\ud558\uc9c0 \uc54a\uace0 \ud750\ub97c \uc218 \uc788\ub294 \ubb3c\uc9c8\uc774\ub2e4. \ub300\ud45c\uc801\uc73c\ub85c \uc561\uccb4\uc640 \uae30\uccb4\uac00 \uc788\ub2e4. \uc720\uccb4 \uc5ed\ud559\uc5d0\uc11c \uc911\uc694\ud55c \uac83\uc740 \ubc00\ub3c4 -> \uc555\ub825 -> \ubd80\ub825 \uc720\uccb4 + \ubb3c\uccb4\uc758 \uc0c1\ub300 \uc6b4\ub3d9 -> \uc800\ud56d -> \ud56d\ub825 \uc720\uccb4\uc758 \uc18d\ub3c4\/\uc810\uc131 -> \ud750\ub984\uc758 \ud2b9\uc131 \uc774\ub2e4. \uac8c\uc784 \ubb3c\ub9ac\uc5d0\uc11c\ub294 \uc2e4\uc81c \uc720\uccb4\ub97c \uc815\ud655\ud558\uac8c \uc2dc\ubbac\ub808\uc774\uc158\ud558\uc9c0 \uc54a\ub354\ub77c\ub3c4 \ubd80\ub825, \uacf5\uae30 \uc800\ud56d, \ubb3c \uc800\ud56d, \ud56d\ub825 \ub4f1\uc744 \uadfc\uc0ac\ud558\ub294 \ub370 \uc774 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[54],"tags":[],"class_list":["post-2135","post","type-post","status-publish","format-standard","hentry","category-physics"],"_links":{"self":[{"href":"https:\/\/wayhope.kro.kr\/index.php?rest_route=\/wp\/v2\/posts\/2135","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wayhope.kro.kr\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/wayhope.kro.kr\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/wayhope.kro.kr\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/wayhope.kro.kr\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2135"}],"version-history":[{"count":2,"href":"https:\/\/wayhope.kro.kr\/index.php?rest_route=\/wp\/v2\/posts\/2135\/revisions"}],"predecessor-version":[{"id":2140,"href":"https:\/\/wayhope.kro.kr\/index.php?rest_route=\/wp\/v2\/posts\/2135\/revisions\/2140"}],"wp:attachment":[{"href":"https:\/\/wayhope.kro.kr\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2135"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wayhope.kro.kr\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2135"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wayhope.kro.kr\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2135"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}