{"id":517,"date":"2021-12-06T17:31:21","date_gmt":"2021-12-06T08:31:21","guid":{"rendered":"http:\/\/mylittleforest.kr\/wordpress\/?p=517"},"modified":"2022-02-09T10:09:33","modified_gmt":"2022-02-09T01:09:33","slug":"03-%eb%a7%8c%ec%9c%a0%ec%9d%b8%eb%a0%a5%ea%b3%bc-%ec%b2%9c%ec%a0%9c%ec%9d%98-%ec%9a%b4%eb%8f%99","status":"publish","type":"post","link":"http:\/\/mylittleforest.kr\/wordpress\/blog\/2021\/12\/06\/517\/","title":{"rendered":"03. \ub9cc\uc720\uc778\ub825\uacfc \ucc9c\uc81c\uc758 \uc6b4\ub3d9"},"content":{"rendered":"\n<h2>\ub9cc\uc720\uc778\ub825\uc758 \ubc95\uce59<\/h2>\n\n\n\n<ul><li>\uc9c8\ub7c9\uc744 \uac00\uc9c0 \ub450 \ubb3c\uccb4\ub294 \uc778\ub825\uc774 \uc791\uc6a9<br>&#8211; \ubb3c\uccb4 \uc9c8\ub7c9\uc758 \uacf1\uc5d0 \ube44\ub840<br>&#8211; \uac70\ub9ac \uc81c\uacf1\uc5d0 \ubc18\ube44\ub840<\/li><li><a rel=\"noreferrer noopener\" href=\"https:\/\/www.mathsisfun.com\/physics\/gravity.html\" target=\"_blank\">\uc911\ub825 (Gravity)<\/a><\/li><li><a rel=\"noreferrer noopener\" href=\"https:\/\/namu.wiki\/w\/%EC%A4%91%EB%A0%A5\" target=\"_blank\">\uc911\ub825 (\ub098\ubb34\uc704\ud0a4)<\/a><br><br><img decoding=\"async\" loading=\"lazy\" width=\"300\" height=\"121\" class=\"wp-image-518\" style=\"width: 250px;\" src=\"http:\/\/mylittleforest.kr\/wordpress\/wp-content\/uploads\/2021\/12\/gravity-m1-m2.jpg\" alt=\"\"><br><br><span class=\"katex-eq\" data-katex-display=\"false\"> \\huge{ F =\u00a0G \\frac{m1 m2}{d^2}\u00a0 } <\/span><br><br><\/li><li>G\ub294 \uc911\ub825\uc0c1\uc218(\uc2e4\ud5d8\uc801\uc73c\ub85c \uce21\uc815) = 6.674\u00d710<sup>-11<\/sup>&nbsp;N m<sup>2<\/sup>\/kg<sup>2<\/sup><\/li><li>\uc9c0\uad6c\ud45c\uba74\uc758 \uc911\ub825 = <strong>9.8 m\/s<sup>2<\/sup> <\/strong><br>&#8211; \uc0ac\uacfc(\uc9c8\ub7c9) 0.1kg \uc774 \uac16\ub294 \ud798\uc740 ?<br>  <strong>F<\/strong>&nbsp;= m<strong>a<\/strong><br>  <strong>F<\/strong>&nbsp;= m<strong><em>g<\/em><\/strong><br>  <strong>F<\/strong>&nbsp;= 0.1 kg \u00d7&nbsp;<strong>9.8 m\/s<sup>2<\/sup><\/strong><br>  <strong>F<\/strong>&nbsp;=&nbsp;<strong>0.98 kg m\/s<sup>2<\/sup><\/strong><br>  <strong>F<\/strong>&nbsp;=&nbsp;<strong>0.98 N<\/strong><br>  =&gt; \uc57d 1 \ub274\ud2bc(N)<\/li><\/ul>\n\n\n\n<h2>\uc9c0\uad6c\uc640 \ub2ec<\/h2>\n\n\n\n<ul><li><a rel=\"noreferrer noopener\" href=\"https:\/\/www.glowscript.org\/#\/user\/gobuksun\/folder\/%EB%AC%BC%EB%A6%AC%EC%BD%94%EB%94%A91%EC%A3%BC%EC%B0%A8\/program\/04-05-01\" target=\"_blank\">\ub2ec\uc774 \uacf5\uc804\ud558\uc9c0 \uc54a\uace0 \uba48\ucdb0 \uc788\ub2e4\uba74 \ub458\uc774 \ub04c\uc5b4\ub2f9\uae30\ub294\ub370 \uac78\ub9ac\ub294 \uc2dc\uac04\uc740?<\/a><\/li><li><a href=\"https:\/\/namu.wiki\/w\/%EB%A1%9C%EC%8A%88%20%ED%95%9C%EA%B3%84\" target=\"_blank\" rel=\"noreferrer noopener\">\ub85c\uc288\ud55c\uacc4<\/a><\/li><\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>GlowScript 2.9 VPython\n\n# \uc9c0\uad6c : \ubc18\uc9c0\ub984 6,400,000m, 6,400km\nEarth = sphere(pos = vector(0,0,0), radius = 6400000, texture = textures.earth)\n\n# \ub2ec : \uc9c0\uad6c\uc640 \uac70\ub9ac 385,000,000m 385,000km, \ubc18\uc9c0\ub984 1,737,000m 1,737km\nMoon = sphere(pos = vector(385000e3,0,0), radius = 1737000, make_trail = True)\n\nsf = 6 #scailing factor\nEarth.radius = sf*Earth.radius\nMoon.radius = sf*Moon.radius\n\n# \uc911\ub825\uc0c1\uc218, \ub9cc\uc720\uc778\ub825\uc0c1\uc218, \ub274\ud134\uc0c1\uc218: 6.674\u00d710-11 N m2\/kg2\nG = 6.67e-11\n\n# \uc9c0\uad6c \uc9c8\ub7c9\nEarth.mass = 5.972e24\n\n# \ub2ec \uc9c8\ub7c9\nMoon.mass = 7.347e22\n\nEarth.v = vec(0,0,0)\nMoon.v = vec(0,0,0)\n\n# time\nt = 0\ndt = 60\n\n# Simulation Loop\nwhile True:\n    rate(1000)    \n\n    # Forces\n    r = Earth.pos - Moon.pos\n    <strong>Moon.f = G * Earth.mass * Moon.mass \/ mag(r) ** 2 * norm(r)<\/strong>\n    Earth.f = -Moon.f \n\n    # Time Integration\n    Moon.v = Moon.v + Moon.f\/Moon.mass*dt\n    Earth.v = Earth.v + Earth.f\/Earth.mass*dt\n\n    Moon.pos = Moon.pos + Moon.v*dt\n    Earth.pos = Earth.pos + Earth.v*dt\n\n    t = t + dt    \n\n    # Collision Check\n    if Earth.radius + Moon.radius &gt; mag(r):\n        print(\"Collision!\")\n        print(t\/60\/60\/24, \"days\")\n        break<\/code><\/pre>\n\n\n\n<h2>\ub2ec\uc758 \uacf5\uc804<\/h2>\n\n\n\n<ul><li>\ub2ec\uc758 \uacf5\uc804\uc18d\ub3c4 =&nbsp; 1,022km\/s<br>&#8211; Moon.v = vec(0, 1022, 0)<\/li><li><a rel=\"noreferrer noopener\" href=\"https:\/\/www.glowscript.org\/#\/user\/gobuksun\/folder\/%EB%AC%BC%EB%A6%AC%EC%BD%94%EB%94%A91%EC%A3%BC%EC%B0%A8\/program\/05-01\" target=\"_blank\">\ucf54\ub4dc 05-01<\/a> <br>&#8211; \ub9cc\uc720\uc778\ub825\uc5d0 \uc758\ud574 (\uc11c\ub85c \ub04c\uc5b4\ub2f9\uaca8) \uc810\uc810 \uc704\ub85c \uc62c\ub77c\uac10<br>&#8211; \uc9c0\uad6c\uc758 \ucd08\uae30\uc18d\ub3c4\ub97c \ub2ec\uc758 \ucd08\uae30\uc18d\ub3c4 \ubc18\ub300 \ubc29\ud5a5\uc73c\ub85c \uc124\uc815<br>&#8211; \uc9c0\uad6c\uc758 \ucd08\uae30\uc18d\ub3c4 = \ub2ec\uc758 \uc18d\ub3c4 x \ub2ec\uc758 \uc9c8\ub7c9 \/ \uc9c0\uad6c\uc758 \uc9c8\ub7c9<br>   Earth.v = -Moon.v * Moon.mass \/ Earth.mass<br>   -&gt; \uc6b4\ub3d9\ub7c9 \ubcf4\uc874\uc758 \ubc95\uce59 : \uc9c0\uad6c\uc640 \ub2ec\uc744 \ud558\ub098\uc758 \uc2dc\uc2a4\ud15c\uc744 \ubcf4\uc558\uc744\ub54c \uc6b4\ub3d9\ub7c9\uc744 0\uc73c\ub85c \ub9cc\ub4dc\ub294 \ubc29\ubc95 (\uc774\ub807\uac8c \ud558\uba74 \uc9c8\ub7c9 \uc911\uc2ec\uc758 \uc704\uce58\uac00 \ubcc0\ud558\uc9c0 \uc54a\uc74c)<\/li><li><a rel=\"noreferrer noopener\" href=\"https:\/\/www.glowscript.org\/#\/user\/gobuksun\/folder\/%EB%AC%BC%EB%A6%AC%EC%BD%94%EB%94%A91%EC%A3%BC%EC%B0%A8\/program\/05-02\" target=\"_blank\">\ucf54\ub4dc 05-02<\/a><\/li><li><a rel=\"noreferrer noopener\" href=\"https:\/\/www.glowscript.org\/#\/user\/gobuksun\/folder\/%EB%AC%BC%EB%A6%AC%EC%BD%94%EB%94%A91%EC%A3%BC%EC%B0%A8\/program\/05-03\" target=\"_blank\">\uacf5\uc804\uc18d\ub3c4\ub97c \ubc18\uc73c\ub85c \ud574\ubcf4\uba74&#8230;<\/a><br>&#8211; Moon.v = 0.5*Moon.v<br>&#8211; \uc9c0\uad6c\uc640 \uac00\uae4c\uc6cc\uc84c\uc744\ub54c \ube68\ub77c\uc9d0 =&gt; <a rel=\"noreferrer noopener\" href=\"https:\/\/namu.wiki\/w\/%EC%BC%80%ED%94%8C%EB%9F%AC%EC%9D%98%20%EB%B2%95%EC%B9%99\" target=\"_blank\">\ucf00\ud50c\ub7ec \ubc95\uce59<\/a>\uc5d0 \uc815\ud655\ud788 \ubd80\ud569<\/li><li><a rel=\"noreferrer noopener\" href=\"https:\/\/www.glowscript.org\/#\/user\/gobuksun\/folder\/%EB%AC%BC%EB%A6%AC%EC%BD%94%EB%94%A91%EC%A3%BC%EC%B0%A8\/program\/05-03-01\" target=\"_blank\">\ub2ec\uc758 \uacf5\uc804\uc18d\ub3c4\ub97c 1.2\ubc30\ub85c \ud574\ubcf4\uba74?<\/a><br>&#8211; Moon.v = 1.2*Moon.v<br>&#8211; 1.5\ubc30\ub85c \ud558\uba74 \uba40\ub9ac \uac00\ubc84\ub9bc. \uc9c0\uad6c \uc911\ub825\uc774 \ub2ec\uc744 \ub04c\uc5b4\ub2f9\uae30\uc9c0 \ubabb\ud568. =&gt; \ud0c8\ucd9c\uc18d\ub825<br>&#8211; \ud0c8\ucd9c\uc18d\ub825 : \uc9c0\uad6c\uc758 \uc911\ub825\uc744 \uc774\uae30\uace0 \ud0c8\ucd9c\ud560 \uc815\ub3c4\uc758 \uc18d\ub825<\/li><\/ul>\n\n\n\n<h2>3\uccb4\uc6b4\ub3d9<\/h2>\n\n\n\n<ul><li>\uc138 \ubb3c\uccb4\uac00 \ubc1b\ub294 \ub9cc\uc720\uc778\ub825\uc744 \ub2e4 \uacc4\uc0b0<\/li><li><a rel=\"noreferrer noopener\" href=\"https:\/\/www.glowscript.org\/#\/user\/gobuksun\/folder\/%EB%AC%BC%EB%A6%AC%EC%BD%94%EB%94%A91%EC%A3%BC%EC%B0%A8\/program\/05-04\" target=\"_blank\">\ucf54\ub4dc 5-04<\/a><br>&#8211; \uc704\uc131 \uc704\uce58\ub97c \uc911\uc2ec\uc5d0<br>&#8211; \uc9c8\ub7c9\uc740 \uc9c0\uad6c\uc9c8\ub7c9\uc758 1\/10 :&nbsp;sat.m = 1\/10*earth.m<br>&#8211; \uc9c0\uad6c\uc640 \ub2ec\uc758 \uc9c8\ub7c9\uc774 \uac19\uc73c\uba74 \ud3c9\ud615 \uc6b4\ub3d9<\/li><li><a rel=\"noreferrer noopener\" href=\"https:\/\/www.glowscript.org\/#\/user\/gobuksun\/folder\/%EB%AC%BC%EB%A6%AC%EC%BD%94%EB%94%A91%EC%A3%BC%EC%B0%A8\/program\/05-04-1\" target=\"_blank\">\ucf54\ub4dc 05-04-1<\/a> : \uc704\uc131\uc758 \uc704\uce58\ub97c \uc544\uc8fc \uc57d\uac04 \uc9c0\uad6c\ucabd\uc73c\ub85c \uc774\ub3d9 :&nbsp;vector(-0.01*r,0,0)<\/li><li><a rel=\"noreferrer noopener\" href=\"https:\/\/www.glowscript.org\/#\/user\/gobuksun\/folder\/%EB%AC%BC%EB%A6%AC%EC%BD%94%EB%94%A91%EC%A3%BC%EC%B0%A8\/program\/05-04-2\" target=\"_blank\">\ucf54\ub4dc 05-04-2<\/a>&nbsp;: \ub354 \uc791\uac8c \uc774\ub3d9 : vector(-0.001*r,0,0)<\/li><li>\uc218\ud559\uc801 \uacc4\uc0b0\uc73c\ub85c\ub294 \uc608\uce21\ud560 \uc218 \uc5c6\uace0 \ucef4\ud4e8\ud130 \uacc4\uc0b0\uc73c\ub85c \uadfc\uc0ac\uc801\uc778 \ud615\ud0dc\ub9cc \uc54c \uc218 \uc788\uc74c.<\/li><\/ul>\n\n\n\n<h2>\ud0d0\uc0ac\uc120\uc744 \ub2ec\ub85c<\/h2>\n\n\n\n<ul><li>\ud0d0\uc0ac\uc120 \uc9c8\ub7c9 15,000 kg<\/li><li>\uc9c0\uad6c \ubc18\uc9c0\ub984\uc5d0\uc11c 10\ubc30 \ub5a8\uc5b4\uc9c4 \uacf3\uc5d0\uc11c \ucd9c\ubc1c<\/li><li>\uc5f0\ub8cc \uc5c6\uc774 \uc9c0\uad6c\uc640 \ub2ec\uc758 \uc778\ub825\uc73c\ub85c\ub9cc \uc774\ub3d9<\/li><\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>#craft\ncraft = sphere(pos=vec(-10*Earth.radius, 0,0), radius=1e6, color=color.yellow, make_trail=True)\ncraft.m = 15e3<\/code><\/pre>\n\n\n\n<ul><li><a rel=\"noreferrer noopener\" href=\"https:\/\/www.glowscript.org\/#\/user\/gobuksun\/folder\/%EB%AC%BC%EB%A6%AC%EC%BD%94%EB%94%A91%EC%A3%BC%EC%B0%A8\/program\/05-05\" target=\"_blank\">\ucf54\ub4dc 05-05<\/a><br>&#8211; \ucd08\uc18d 2km \uc18d\ub3c4 : craft.v = vec(0,2e3,0) # initial vel without moon<br>&#8211; \uc9c0\uad6c\ub97c \ubabb \ubc97\uc5b4\ub0a8.<\/li><li><a rel=\"noreferrer noopener\" href=\"https:\/\/www.glowscript.org\/#\/user\/gobuksun\/folder\/%EB%AC%BC%EB%A6%AC%EC%BD%94%EB%94%A91%EC%A3%BC%EC%B0%A8\/program\/05-05-1\" target=\"_blank\">\ucf54\ub4dc 05-05-1<\/a><br>&#8211; \ucd08\uc18d 3.5km : craft.v = vec(0,3.5e3,0) # hyperbolic<br>&#8211; \uba40\ub9ac \uac00\ubc84\ub9bc.<\/li><li><a rel=\"noreferrer noopener\" href=\"https:\/\/www.glowscript.org\/#\/user\/gobuksun\/folder\/%EB%AC%BC%EB%A6%AC%EC%BD%94%EB%94%A91%EC%A3%BC%EC%B0%A8\/program\/05-05-2\" target=\"_blank\">\ucf54\ub4dc 05-05-2<\/a><br>&#8211; #craft.v = vec(0,3.3e3,0) : \ub2ec\uc758 \ub4b7\uba74 \ud0d0\uc0ac<br>&#8211; #craft.v = vec(0,3.27e3,0) #critical pt : \ub2ec\uc758 \uc55e\uba74 \ud0d0\uc0ac.<br>&#8211; \ubb3c\uace0\uae30 \ubaa8\uc591 \uad18\ub3c4<\/li><\/ul>\n\n\n\n<h2>\uc2dc\ubbac\ub808\uc774\uc158<\/h2>\n\n\n\n<ul><li>\uc218\ud559\uc801 \uc77c\ubc18\ud574\ub97c \uac00\uc9c0\uc9c0 \ubabb\ud558\ub294 3\uccb4\uc6b4\ub3d9\uc758 \uc6c0\uc9c1\uc784\uc744 \ud655\uc2e0\ud560 \uc218 \uc788\ub294 \uc774\uc720?<br>&#8211; \uc2dc\uac04 \uac04\uaca9\uc744 \uc904\uc5ec \uc2dc\ubbac\ub808\uc774\uc158\uc744 \uc9c4\ud589\ud574\ub3c4 \ud018\ub3c4\uac00 \ud06c\uac8c \ub2ec\ub77c\uc9c0\uc9c0 \uc54a\uc74c\uc744 \ud655\uc778<br>&#8211; \uc2dc\ubbac\ub808\uc774\uc158\uc744 \ud1b5\ud574 \uadfc\uc0ac\ud574\ub97c \uad6c\ud568<\/li><\/ul>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\ub9cc\uc720\uc778\ub825\uc758 \ubc95\uce59 \uc9c8\ub7c9\uc744 \uac00\uc9c0 \ub450 \ubb3c\uccb4\ub294 \uc778\ub825\uc774 \uc791\uc6a9&#8211; \ubb3c\uccb4 \uc9c8\ub7c9\uc758 \uacf1\uc5d0 \ube44\ub840&#8211; \uac70\ub9ac \uc81c\uacf1\uc5d0 \ubc18\ube44\ub840 \uc911\ub825 (Gravity) \uc911\ub825 (\ub098\ubb34\uc704\ud0a4) G\ub294 \uc911\ub825\uc0c1\uc218(\uc2e4\ud5d8\uc801\uc73c\ub85c \uce21\uc815) = 6.674\u00d710-11&nbsp;N m2\/kg2 \uc9c0\uad6c\ud45c\uba74\uc758 \uc911\ub825 = 9.8 m\/s2 &#8211; \uc0ac\uacfc(\uc9c8\ub7c9) 0.1kg \uc774 \uac16\ub294 \ud798\uc740 ? F&nbsp;= ma F&nbsp;= mg F&nbsp;= 0.1 kg \u00d7&nbsp;9.8 m\/s2 F&nbsp;=&nbsp;0.98 kg m\/s2 F&nbsp;=&nbsp;0.98 N =&gt; \uc57d 1 \ub274\ud2bc(N) [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false},"categories":[45],"tags":[],"_links":{"self":[{"href":"http:\/\/mylittleforest.kr\/wordpress\/wp-json\/wp\/v2\/posts\/517"}],"collection":[{"href":"http:\/\/mylittleforest.kr\/wordpress\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/mylittleforest.kr\/wordpress\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/mylittleforest.kr\/wordpress\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/mylittleforest.kr\/wordpress\/wp-json\/wp\/v2\/comments?post=517"}],"version-history":[{"count":18,"href":"http:\/\/mylittleforest.kr\/wordpress\/wp-json\/wp\/v2\/posts\/517\/revisions"}],"predecessor-version":[{"id":1010,"href":"http:\/\/mylittleforest.kr\/wordpress\/wp-json\/wp\/v2\/posts\/517\/revisions\/1010"}],"wp:attachment":[{"href":"http:\/\/mylittleforest.kr\/wordpress\/wp-json\/wp\/v2\/media?parent=517"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/mylittleforest.kr\/wordpress\/wp-json\/wp\/v2\/categories?post=517"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/mylittleforest.kr\/wordpress\/wp-json\/wp\/v2\/tags?post=517"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}