{"id":8718,"date":"2009-09-29T14:13:00","date_gmt":"2009-09-29T14:13:00","guid":{"rendered":"http:\/\/melotopia.net\/b\/?p=8718"},"modified":"2009-09-29T14:13:00","modified_gmt":"2009-09-29T14:13:00","slug":"%ec%a7%84%ec%9e%90%ec%9d%98-%eb%93%b1%ec%8b%9c%ec%84%b1","status":"publish","type":"post","link":"http:\/\/melotopia.net\/b\/?p=8718","title":{"rendered":"\uc9c4\uc790\uc758 \ub4f1\uc2dc\uc131"},"content":{"rendered":"
\n \uc774\ubc88\uc2dc\uac04\uc5d0\ub294 \uc9c4\uc790\uc758 \ub4f1\uc2dc\uc131\uc744 \uc218\ud559\uc801\uc73c\ub85c \uc99d\uba85\ud574 \ubcf4\uc790.
\n
\n \uc77c\ub2e8, \uc9c4\uc790\uc758 \ub4f1\uc2dc\uc131\uc774 \ubb54\uc9c0\ub098 \uc54c\uc544\uc57c \uc99d\uba85\uc744 \ud558\uaca0\ub2e4. \uc9c4\uc790\uc758 \ub4f1\uc2dc\uc131\uc774\ub780 “\uae38\uc774\uac00 \uac19\uc740 \uc9c4\uc790\ub294 \uc9c8\ub7c9\uc5d0 \uad00\uacc4 \uc5c6\uc774 \uc8fc\uae30\uac00 \uac19\ub2e4”\ub294 \uac83\uc774\ub2e4.<\/p>\n

\uc6d0\ub798 \uc774\ub7f0 \ubb38\uc81c\ub97c \ud480 \ub54c\ub294 \uad00\uc2b5\uc801\uc73c\ub85c \uacf5\uae30\uc758 \uc800\ud56d\uc740 \ubb34\uc2dc\ud55c\ub2e4. (\uadf8\ub7ec\ub824\ub2c8 \ud558\uc790.)<\/p>\n

\n\"\"\n<\/div>\n

\uadf8\ub9bc\uc744 \ud558\ub098 \ud37c\uc654\ub2e4. \uc6d0\ubcf8 \ucd9c\ucc98\ub294 \uc544\ub798.
\n
\n
\n http:\/\/moolynaru.knu.ac.kr\/high_phy_ii\/force\/26%EB%8B%A8%EC%A7%84%EC%9E%90\/26%EB%8B%A8%EC%A7%84%EC%9E%90.htm
\n <\/a>
\n
\n \uc9c4\uc790\ub294 \uc9c4\uc790\uc758 \ub048\uc774 \ud33d\ud33d\ud558\uac8c \ub2f9\uaca8\uc838 \uc788\ub294 \ud55c \uc5b4\uca0c\ub4e0 \uc6d0 \uc704\uc5d0\uc11c \uc6c0\uc9c1\uc77c \uc218\ubc16\uc5d0 \uc5c6\ub2e4. \ub530\ub77c\uc11c, \uc911\ub825\uc744 \uc5b4\ub290 \ubc29\ud5a5\uc73c\ub85c \ubc1b\ub4e0\uc9c0\uac04\uc5d0 \uc0c1\uad00 \uc5c6\uc774, \uc2e4\uc81c\ub85c \uc911\ub825\uacfc \uc7a5\ub825\uc758 \ud569\ub825\uc740 \uc811\uc120 \ubc29\ud5a5\uc73c\ub85c\ub9cc \ub098\ud0c0\ub098\uac8c \ub41c\ub2e4. \uadf8\ub9bc\uc744 \ubcf4\uba74 \uc9c4\uc790\ub97c \uac00\uc6b4\ub370\ub85c \ub04c\uc5b4\ub2f9\uae30\ub294 \ud798\uc740 $mg \\sin\\theta$\uac00 \uc788\ub2e4. \uc911\ub825 \uc911\uc5d0\uc11c \uc624\uc9c1 \uadf8\ub9cc\ud07c\ub9cc \uc2e4\uc81c\ub85c \uc791\uc6a9\ud558\uac8c \ub41c\ub2e4\ub294 \ub73b\uc774\ub2e4. (\uc65c \uadf8\ub807\uac8c \ub418\ub294\uc9c0\ub294 \uc790\uc2b5.)<\/p>\n

\uadf8\ub7fc \uc6b0\ub9ac\uc758 \uc704\ub300\ud55c \ubc29\uc815\uc2dd F=ma\ub97c \uc801\uc6a9\ud558\uba74
\n
\n $ma=-mg sin\\theta$
\n
\n \uc55e\uc5d0 -\ubd80\ud638\uac00 \ubd99\uc740 \uc774\uc720\ub294, \ud798\uc774 \uc791\uc6a9\ud558\ub294 \ubc29\ud5a5\uc774 $\\theta$\uac00 \ucee4\uc9c0\ub294 \ubc29\ud5a5\uc758 \ubc18\ub300\ubc29\ud5a5\uc774\uae30 \ub54c\ubb38\uc774\ub2e4. \uc911\uc2ec\uc810 \uadfc\ucc98\uc5d0\uc11c $\\theta$\uac00 \ucee4\uc9c0\ub294 \ubc29\ud5a5\uc740 \ubc14\uae65 \ubc29\ud5a5\uc778\ub370 (\uadf8\ub9bc\uc758 \uc0c1\ud669\uc5d0\uc11c\ub294 \uc624\ub978\ucabd) \ud798\uc774 \uc2e4\uc81c\ub85c \uc791\uc6a9\ud558\ub294 \ubc29\ud5a5\uc740 \uc548\ucabd \ubc29\ud5a5\uc774\ub2e4. (\uadf8\ub9bc\uc5d0\uc11c\ub294 \uc624\ub978\ucabd)<\/p>\n

\uadf8\ub9ac\uace0 \uc5ec\uae30\uc11c \uac00\uc815\uc774 \ud558\ub098 \ub354 \ub4e4\uc5b4\uac04\ub2e4. \ubcc4\ub2e4\ub978 \uc774\uc720\ub294 \uc5c6\uc9c0\ub9cc, \uc9c4\uc790\uac00 \uc6c0\uc9c1\uc774\ub294 \uc9c4\ud3ed\uc774 \uc544\uc8fc \uc791\ub2e4\uace0 \uac00\uc815\ud55c\ub2e4. \uc5ec\uae30\uc11c “\uc544\uc8fc \uc791\ub2e4”\ub294
\n\ub9d0\uc758 \uc758\ubbf8\ub294 “\uadf8\ub807\uac8c \uac00\uc815\ud574\uc11c \ud480\uc5b4\ub3c4 \ud2c0\ub9ac\uc9c0 \uc54a\uc744 \uc815\ub3c4\ub85c \uc791\ub2e4”\ub294 \ub73b\uc774\ub2e4. \uc989, \uc9c4\ud3ed\uc774 \ucee4\uc9c0\uba74 \uc774\ub807\uac8c \ud480 \uc218 \uc5c6\ub2e4. \uc9c4\ud3ed\uc774
\n\ucee4\uc9c0\uac8c \ub418\uba74 \ube44\uc120\ud615 \ubc29\uc815\uc2dd\uc774 \ub098\uc624\ub294\ub370, \ube44\uc120\ud615 \ubc29\uc815\uc2dd\uc740 \ud480\uae30\uac00 \ub300\ub2e8\ud788 \uc5b4\ub835\ub2e4. \uc9c4\ud3ed\uc774 \uc791\uc73c\uba74 $\\theta$\uac00 \uc791\ub2e4\ub294 \ub73b\uc774\ubbc0\ub85c $mg \\sin\\theta$\ub97c \uadfc\uc0ac\uc2dd\uc73c\ub85c \uc801\uc5b4\uc11c \ub300\ub7b5 $mg
\n\\theta$\ub85c \uc4f8 \uc218 \uc788\ub2e4. (\uc6d0\ud55c\ub2e4\uba74 sin\ud568\uc218\uc758 3\ucc28\uae4c\uc9c0 \uc368\ub3c4 \ub41c\ub2e4. \ubb3c\ub860 \uadf8 \ubc29\uc815\uc2dd\uc740 \uc54c\uc544\uc11c \uc798 \ud480\uc5b4\ubcf4\uc790. \uc5ec\uae30\uc11c\ub294
\n\ub2e4\ub8e8\uc9c0 \uc54a\ub294\ub2e4.)<\/p>\n

$ma=-mg\\theta$<\/p>\n

\ub530\ub77c\uc11c
\n
\n $a=-g\\theta$
\n
\n \uc77c\ub2e8, \uc5ec\uae30\uc11c \uc9c8\ub7c9\uc774 \uc0ac\ub77c\uc84c\ub2e4\ub294 \uc0ac\uc2e4\uc5d0 \ub180\ub77c\uc6cc\ud574\uc57c \ud55c\ub2e4. \uc5ec\uae30\uc11c, \uc67c\ucabd\uc5d0 \uc788\ub358 ma\uc758 m\uc740 \uad00\uc131\uc9c8\ub7c9\uc774\uace0 \uc624\ub978\ucabd\uc5d0 \uc788\ub358 mg\uc758 m\uc740 \uc911\ub825\uc9c8\ub7c9\uc778\ub370, \ub458\uc744 \uc57d\ubd84\ud574\ub3c4 \uad1c\ucc2e\ub2e4\ub294 \uc0ac\uc2e4\uc744 \uc544\uc778\uc288\ud0c0\uc778\uc774 \ub9d0\ud588\uc5c8\ub2e4. \uc774\uac8c \uadf8 \uc720\uba85\ud55c \uc77c\ubc18 \uc0c1\ub300\uc131 \uc6d0\ub9ac\ub2e4.
\n
\n \uadf8\ub7fc, \uac00\uc18d\ub3c4\ub294 \ubb34\uc5c7\uc758 \uac00\uc18d\ub3c4\uc778\uac00? \ub2f9\uc5f0\ud788 \ubcc0\uc704\uc758 2\ucc28 \ubbf8\ubd84\uc774\ub2e4. \uc5ec\uae30\uc11c \ubcc0\uc704\ub294 x\uc778\ub370, \uc6b0\ub9ac\ub294 \uc9c0\uae08 \ubcc0\uc218\ub97c $\\theta$\ub85c \uc4f0\uace0 \uc788\uc5c8\uc73c\ubbc0\ub85c \ub458\uc744 \ubc14\uafd4\uc904 \ud544\uc694\uac00 \uc788\ub2e4.
\n
\n \uc704\uc758 \uadf8\ub9bc\uc744 \ubcf4\uba74 \uc54c\uaca0\uc9c0\ub9cc, sin\uac12\uc740 \ub192\uc774\ub97c \ube57\ubcc0\uc758 \uae38\uc774\ub85c \ub098\ub208 \uac12\uc774\uace0, \ube57\ubcc0\uc744 $l$\uc774\ub77c\uace0 \ud558\uace0 \ub192\uc774\ub97c $x$\ub77c\uace0 \ud558\uba74, $\\theta = x\/l$\uc774 \ub41c\ub2e4. \ub300\uc785\ud558\uc790.
\n
\n $a=-gx\/l$
\n
\n \uc5ec\uae30\uc11c $g$\ub791 $l$\uc740 \uc0c1\uc218\ub2c8\uae4c \uc2e0\uacbd \uc548\uc368\ub3c4 \ub418\uace0, \uc5b4\uca0c\ub4e0 x\ub97c \ub450\ubc88 \ubbf8\ubd84\ud55c\uac8c a\ub2c8\uae4c, \ub450\ubc88 \ubbf8\ubd84\ud574\uc11c \uc790\uae30 \uc790\uc2e0\uc774 \uadf8\ub300\ub85c \ub098\uc624\uace0 -\uac00 \ubd99\ub294 \ud568\uc218\ub97c \ucc3e\uc73c\uba74 \ub41c\ub2e4. \ub2f9\uc5f0\ud788, \ub204\uad6c\ub098 \uc54c\uaca0\uc9c0\ub9cc sin\uacfc cos\ud568\uc218\uac00 \uc788\ub2e4. \ub123\uc790.
\n
\n $x=Asin(\\sqrt{g\/l}t)+Bcos(\\sqrt{g\/l}t)$
\n
\n \uc5ec\uae30\uc11c A\uc640 B\ub294 \ucc98\uc74c\uc5d0($t=t_0$) \uc5b4\ub514\uc11c \uc5bc\ub9c8\ub098 \ube60\ub974\uac8c \uc2dc\uc791\ud588\ub290\ub0d0\uc5d0 \ub530\ub77c\uc11c \ub2ec\ub77c\uc9c4\ub2e4. \uc989, \uc9c4\uc790\ub97c \ucc98\uc74c\uc5d0 \ubc00 \ub54c \uc5b4\ub514\uc11c \uc5b4\ub290 \ubc29\ud5a5\uc73c\ub85c \uc5bc\ub9c8\ub098 \uc138\uac8c \ubc00\uc5b4\uc92c\ub294\uc9c0\uc5d0 \ub530\ub77c\uc11c \uacb0\uc815\ub41c\ub2e4.<\/p>\n

(\uc5ec\uae30\uc11c, sin\ud568\uc218\uc640 cos\ud568\uc218 \uc774\uc678\uc758 \ub2e4\ub978 \ud568\uc218\uac00 \uc788\uc9c0 \uc54a\uc740\uac00? \ub77c\uace0 \uc0dd\uac01\ud560 \uc218\ub3c4 \uc788\ub294\ub370, sin\uacfc cos\ud568\uc218\ub9cc \uc788\uc73c\uba74 \ubaa8\ub4e0 \uc9c4\ub3d9\uc744 \ub2e4 \ud45c\ud604\ud560 \uc218 \uc788\uace0, \uadf8 \uc678\uc758 \ub2e4\ub978 \ud568\uc218\ub85c \ud45c\ud604\ud574\ubd10\uc57c \uadf8\uac74 sin\uacfc cos\ud568\uc218\uc758 \ud569 \uc815\ub3c4\ub85c \ud45c\ud604\ub41c\ub2e4\ub294 \uac83\uc744 \uc99d\uba85\ud560 \uc218 \uc788\ub2e4.)<\/p>\n

\uadf8\ub7fc \uc800 \ud568\uc218\ub294 \uc2dc\uac04\uc774 $2\\pi\\sqrt{l\/g}$\ub9cc\ud07c \uc9c0\ub0a0 \ub54c\ub9c8\ub2e4 \uc6d0\ub798 \uc790\ub9ac\ub85c \uc6d0\ub798\uc758 \uc18d\ub825\uc744 \uac16\uace0 \ub418\ub3cc\uc544 \uc624\uac8c \ub41c\ub2e4. \uc989, \ubc14\ub85c \uc774 \uc2dc\uac04\uc774 \uc9c4\uc790\uc758 \uc8fc\uae30\uac00 \ub41c\ub2e4. \uadf8\ub7f0\ub370, \uc8fc\uae30\ub97c \ub098\ud0c0\ub0b4\ub294 \uc2dd\uc744 \ubcf4\uba74 \uc9c8\ub7c9\uc774 \ubcf4\uc774\uc9c0 \uc54a\ub294\ub2e4. (\uc544\uae4c \uc0ac\ub77c\uc84c\uc73c\ub2c8\uae4c….)
\n
\n \ub530\ub77c\uc11c \ub2e8\uc9c4\uc790\ub294 \uae38\uc774\uc640 \uc911\ub825\uac00\uc18d\ub3c4\uac00 \uc815\ud574\uc9c0\uba74 \uadf8 \uc8fc\uae30\ub3c4 \uacb0\uc815\ub418\uba70, \uc9c8\ub7c9\uc774 \uc5bc\ub9c8\ub098 \ud070\uac00\uc5d0\ub294 \uc601\ud5a5\uc744 \ubc1b\uc9c0 \uc54a\ub294\ub2e4. (\ub2e8, \uc9c4\uc790\uc758 \ub048\uc774 \ub04a\uc5b4\uc9c0\uc9c0\ub294 \uc54a\ub294\ub2e4\ub294 \uac00\uc815\uc774 \ub610 \ud544\uc694\ud558\ub2e4.)<\/p>\n

\uc774 \uc131\uc9c8\uc744 \uc774\uc6a9\ud574\uc11c \uc911\ub825\uac00\uc18d\ub3c4\ub97c \uce21\uc815\ud560 \uc218 \uc788\ub294\ub370, \uacf5\ub300, \uc790\uc5f0\ub300 \uac00\uba74 \ud544\uc218\uc801\uc73c\ub85c \ub4e3\uc9c0\ub9cc \ub300\ubd80\ubd84 \uc2eb\uc5b4\ud558\ub294 \uc77c\ubc18\ubb3c\ub9ac\ud559 \uc2e4\ud5d8\uc5d0\uc11c \ub2e4\ub8e8\uac8c \ub41c\ub2e4.<\/p>\n

\uc774\uc5d0 \ub300\ud55c \uc880 \ub354 \uc790\uc138\ud55c \uc124\uba85\uc740 \uc544\ub798 \ud398\uc774\uc9c0\ub97c \ucc38\uace0\ud558\uc790.
\n
\n
\n http:\/\/physica.gsnu.ac.kr\/phtml\/mechanics\/oscillation\/application\/application.html
\n <\/a><\/p>\n

\n
\n
\n\"\uc2e0\uace0\"
\n<\/a>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

\uc774\ubc88\uc2dc\uac04\uc5d0\ub294 \uc9c4\uc790\uc758 \ub4f1\uc2dc\uc131\uc744 \uc218\ud559\uc801\uc73c\ub85c \uc99d\uba85\ud574 \ubcf4\uc790. \uc77c\ub2e8, \uc9c4\uc790\uc758 \ub4f1\uc2dc\uc131\uc774 \ubb54\uc9c0\ub098 \uc54c\uc544\uc57c \uc99d\uba85\uc744 \ud558\uaca0\ub2e4. \uc9c4\uc790\uc758 \ub4f1\uc2dc\uc131\uc774\ub780 “\uae38\uc774\uac00 \uac19\uc740 \uc9c4\uc790\ub294 \uc9c8\ub7c9\uc5d0 \uad00\uacc4 \uc5c6\uc774 \uc8fc\uae30\uac00 \uac19\ub2e4”\ub294 \uac83\uc774\ub2e4. \uc6d0\ub798 \uc774\ub7f0 \ubb38\uc81c\ub97c \ud480 \ub54c\ub294 \uad00\uc2b5\uc801\uc73c\ub85c \uacf5\uae30\uc758 \uc800\ud56d\uc740 \ubb34\uc2dc\ud55c\ub2e4. (\uadf8\ub7ec\ub824\ub2c8 \ud558\uc790.) \uadf8\ub9bc\uc744 \ud558\ub098 \ud37c\uc654\ub2e4. \uc6d0\ubcf8 \ucd9c\ucc98\ub294 \uc544\ub798. http:\/\/moolynaru.knu.ac.kr\/high_phy_ii\/force\/26%EB%8B%A8%EC%A7%84%EC%9E%90\/26%EB%8B%A8%EC%A7%84%EC%9E%90.htm \uc9c4\uc790\ub294 \uc9c4\uc790\uc758 \ub048\uc774 \ud33d\ud33d\ud558\uac8c \ub2f9\uaca8\uc838 \uc788\ub294 \ud55c \uc5b4\uca0c\ub4e0 \uc6d0 \uc704\uc5d0\uc11c \uc6c0\uc9c1\uc77c \uc218\ubc16\uc5d0 \uc5c6\ub2e4. […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_crdt_document":"","_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[2],"tags":[],"class_list":["post-8718","post","type-post","status-publish","format-standard","hentry","category-academic"],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p8o6gA-2gC","jetpack-related-posts":[],"jetpack_likes_enabled":true,"_links":{"self":[{"href":"http:\/\/melotopia.net\/b\/index.php?rest_route=\/wp\/v2\/posts\/8718","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/melotopia.net\/b\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/melotopia.net\/b\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/melotopia.net\/b\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/melotopia.net\/b\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=8718"}],"version-history":[{"count":0,"href":"http:\/\/melotopia.net\/b\/index.php?rest_route=\/wp\/v2\/posts\/8718\/revisions"}],"wp:attachment":[{"href":"http:\/\/melotopia.net\/b\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=8718"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/melotopia.net\/b\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=8718"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/melotopia.net\/b\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=8718"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}