{"id":22,"date":"2023-06-27T12:43:20","date_gmt":"2023-06-27T12:43:20","guid":{"rendered":"https:\/\/physigeek.com\/cn\/%e7%ac%ac%e4%ba%8c%e4%b8%aa%e5%b9%b3%e8%a1%a1%e6%9d%a1%e4%bb%b6\/"},"modified":"2023-06-27T12:43:20","modified_gmt":"2023-06-27T12:43:20","slug":"%e7%ac%ac%e4%ba%8c%e4%b8%aa%e5%b9%b3%e8%a1%a1%e6%9d%a1%e4%bb%b6","status":"publish","type":"post","link":"https:\/\/physigeek.com\/cn\/%e7%ac%ac%e4%ba%8c%e4%b8%aa%e5%b9%b3%e8%a1%a1%e6%9d%a1%e4%bb%b6\/","title":{"rendered":"\u7b2c\u4e8c\u4e2a\u5e73\u8861\u6761\u4ef6"},"content":{"rendered":"<p>\u672c\u6587\u89e3\u91ca\u4e86\u7b2c\u4e8c\u4e2a\u5e73\u8861\u6761\u4ef6\u662f\u4ec0\u4e48\u53ca\u5176\u7ec4\u6210\u3002\u60a8\u8fd8\u5c06\u627e\u5230\u7b2c\u4e8c\u4e2a\u5e73\u8861\u6761\u4ef6\u7684\u771f\u5b9e\u793a\u4f8b\uff0c\u6700\u540e\uff0c\u60a8\u5c06\u80fd\u591f\u901a\u8fc7\u9010\u6b65\u89e3\u51b3\u7684\u7ec3\u4e60\u8fdb\u884c\u8bad\u7ec3\u3002 <\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%C2%BFCual-es-la-segunda-condicion-de-equilibrio\"><\/span>\u7b2c\u4e8c\u4e2a\u5e73\u8861\u6761\u4ef6\u662f\u4ec0\u4e48\uff1f<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>\u5728\u7269\u7406\u5b66\u4e2d\uff0c<strong>\u7b2c\u4e8c\u4e2a\u5e73\u8861\u6761\u4ef6<\/strong>\u662f\u4e00\u6761\u89c4\u5219\uff0c\u89c4\u5b9a\u5982\u679c\u65bd\u52a0\u5230\u7269\u4f53\u4e0a\u7684\u529b\u77e9\u603b\u548c\u4e3a\u96f6\uff0c\u5219\u7269\u4f53\u5904\u4e8e\u65cb\u8f6c\u5e73\u8861\u72b6\u6001\u3002<\/p>\n<p>\u56e0\u6b64\uff0c\u5f53\u5408\u6210\u529b\u77e9\u4e3a\u96f6\u65f6\uff0c\u7b2c\u4e8c\u5e73\u8861\u6761\u4ef6\u5f97\u5230\u6ee1\u8db3\u3002\u4ece\u6570\u5b66\u4e0a\u8bb2\uff0c\u7b2c\u4e8c\u4e2a\u5e73\u8861\u6761\u4ef6\u7528\u4ee5\u4e0b\u516c\u5f0f\u8868\u793a\uff1a<\/p>\n<p class=\"has-text-align-center\">\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/ql-cache\/quicklatex.com-d8a19d84c103481347db47c0b8a6d2a8_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\displaystyle\\somme \\vv{M}=0\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"52\" style=\"vertical-align: 0px;\"><\/p>\n<\/p>\n<p>\u8bf7\u6ce8\u610f\uff0c\u529b\u77e9\u5fc5\u987b\u77e2\u91cf\u76f8\u52a0\uff0c\u56e0\u4e3a\u4f5c\u7528\u5728\u4e0d\u540c\u8f74\u4e0a\u7684\u529b\u77e9\u65e0\u6cd5\u76f8\u52a0\u3002\u5982\u679c\u4f7f\u7528\u5171\u9762\u529b\uff08\u4e8c\u7ef4\uff09\uff0c\u8fd9\u79cd\u60c5\u51b5\u4e0d\u662f\u95ee\u9898\uff0c\u56e0\u4e3a\u529b\u77e9\u59cb\u7ec8\u6cbf\u76f8\u540c\u65b9\u5411\u79fb\u52a8\uff0c\u4f46\u5728\u4e09\u7ef4\u4e2d\u5de5\u4f5c\u65f6\u5fc5\u987b\u610f\u8bc6\u5230\u8fd9\u4e00\u70b9\u3002<\/p>\n<p class=\"has-text-align-center\">\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/ql-cache\/quicklatex.com-ec7e37abbe42c976a3809c9e0f2724f2_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\displaystyle\\sum\\vv{M_x}=0\\qquad\\sum\\vv{M_y}=0\\qquad\\sum\\vv{M_z}=0\\qquad\" title=\"Rendered by QuickLaTeX.com\" height=\"25\" width=\"336\" style=\"vertical-align: -8px;\"><\/p>\n<\/p>\n<p>\u8bf7\u8bb0\u4f4f\uff0c\u529b\u5728\u4e00\u70b9\u4e0a\u7684\u529b\u77e9\uff08\u6216\u626d\u77e9\uff09\u662f\u901a\u8fc7\u5c06\u529b\u7684\u503c\u4e58\u4ee5\u529b\u8ddd\u8be5\u70b9\u7684\u5782\u76f4\u8ddd\u79bb\u6765\u8ba1\u7b97\u7684\u3002<\/p>\n<p class=\"has-text-align-center\">\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/ql-cache\/quicklatex.com-765ae97c83695144c85bb65446416345_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"M=F\\cdot d\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"79\" style=\"vertical-align: 0px;\"><\/p>\n<\/p>\n<p>\u7136\u540e\uff0c\u4e3a\u4e86\u6ee1\u8db3\u7b2c\u4e8c\u4e2a\u5e73\u8861\u6761\u4ef6\u7684\u65b9\u7a0b\uff0c\u7269\u4f53\u5fc5\u987b\u5177\u6709\u96f6\u89d2\u52a0\u901f\u5ea6\uff0c\u6216\u8005\u6362\u53e5\u8bdd\u8bf4\uff0c\u5904\u4e8e\u8fd9\u79cd\u72b6\u6001\u7684\u7269\u4f53\u4e0d\u65cb\u8f6c\uff08\u5b83\u5904\u4e8e\u9759\u6b62\u72b6\u6001\uff09\u6216\u4ee5\u6052\u5b9a\u7684\u89d2\u901f\u5ea6\u65cb\u8f6c\u3002<\/p>\n<p>\u56e0\u6b64\uff0c\u6211\u4eec\u53ef\u4ee5\u533a\u5206\u65cb\u8f6c\u5e73\u8861\u7684\u7c7b\u578b\uff1a<\/p>\n<ul>\n<li><strong>\u9759\u6001\u65cb\u8f6c\u5e73\u8861<\/strong>\uff1a\u5f53\u529b\u77e9\u4e4b\u548c\u4e3a\u96f6\u4e14\u7269\u4f53\u7684\u89d2\u901f\u5ea6\u4e3a\u96f6\u65f6\u3002<\/li>\n<li><strong>\u52a8\u6001\u65cb\u8f6c\u5e73\u8861<\/strong>\uff1a\u5f53\u529b\u77e9\u4e4b\u548c\u4e3a\u96f6\u4e14\u7269\u4f53\u7684\u89d2\u901f\u5ea6\u6052\u5b9a\uff08\u4e0d\u540c\u4e8e\u96f6\uff09\u65f6\u3002 <\/li>\n<\/ul>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Ejemplos-de-la-segunda-condicion-de-equilibrio\"><\/span>\u7b2c\u4e8c\u5e73\u8861\u6761\u4ef6\u7684\u4f8b\u5b50<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>\u8003\u8651\u5230\u7b2c\u4e8c\u4e2a\u5e73\u8861\u6761\u4ef6\u7684\u5b9a\u4e49\uff0c\u6211\u4eec\u73b0\u5728\u5c06\u901a\u8fc7\u4e00\u4e9b\u65e5\u5e38\u751f\u6d3b\u4e2d\u7684\u4f8b\u5b50\u6765\u5b8c\u6210\u5bf9\u8fd9\u4e2a\u6982\u5ff5\u7684\u7406\u89e3\u3002<\/p>\n<p>\u7b2c\u4e8c\u4e2a\u5e73\u8861\u6761\u4ef6\u7684\u4e00\u4e2a\u5e38\u89c1\u4f8b\u5b50\u662f\u5929\u5e73\u3002\u5f53\u7cfb\u7edf\u7a33\u5b9a\u65f6\uff0c\u5e73\u8861\u81c2\u505c\u6b62\u65cb\u8f6c\uff0c\u56e0\u6b64\u529b\u77e9\u4e4b\u548c\u4e3a\u96f6\uff0c\u7cfb\u7edf\u5904\u4e8e\u65cb\u8f6c\u5e73\u8861\u3002 <\/p>\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/uploads\/2023\/09\/deuxieme-condition-dequilibre.png\" alt=\"\u7b2c\u4e8c\u4e2a\u5e73\u8861\u6761\u4ef6\" class=\"wp-image-430\" width=\"303\" height=\"303\" srcset=\"https:\/\/physigeek.com\/wp-content\/uploads\/2023\/09\/deuxieme-condition-dequilibre-300x300.png 300w, https:\/\/physigeek.com\/wp-content\/uploads\/2023\/09\/deuxieme-condition-dequilibre-150x150.png 150w, https:\/\/physigeek.com\/wp-content\/uploads\/2023\/09\/deuxieme-condition-dequilibre-768x768.png 768w, https:\/\/physigeek.com\/wp-content\/uploads\/2023\/09\/deuxieme-condition-dequilibre.png 781w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\"><\/figure>\n<\/div>\n<p>\u53e6\u4e00\u4e2a\u5177\u4f53\u7684\u4f8b\u5b50\u662f\u5730\u7403\u3002\u884c\u661f\u4e0d\u65ad\u7ed5\u5176\u8f74\u65cb\u8f6c\uff0c\u4f46\u88ab\u8ba4\u4e3a\u4ee5\u6052\u5b9a\u89d2\u901f\u5ea6\u65cb\u8f6c\uff0c\u56e0\u6b64\u6ee1\u8db3\u7b2c\u4e8c\u4e2a\u5e73\u8861\u6761\u4ef6\u3002<\/p>\n<p>\u6700\u540e\uff0c\u5f53\u6211\u4eec\u4ece\u5929\u82b1\u677f\u4e0a\u60ac\u6302\u4e00\u4e2a\u7269\u4f53\u5e76\u5c06\u5176\u4fdd\u6301\u9759\u6b62\u65f6\uff0c\u8be5\u7269\u4f53\u540c\u65f6\u6ee1\u8db3\u7b2c\u4e8c\u4e2a\u5e73\u8861\u6761\u4ef6\u548c\u7b2c\u4e00\u4e2a\u5e73\u8861\u6761\u4ef6\uff0c\u56e0\u4e3a\u5b83\u5904\u4e8e\u5e73\u52a8\u5e73\u8861\u548c\u5e73\u52a8\u5e73\u8861\u3002\u56de\u8f6c\u3002<\/p>\n<p>\u5982\u679c\u4f60\u8fd8\u4e0d\u6e05\u695a\u7b2c\u4e00\u4e2a\u5e73\u8861\u6761\u4ef6\u662f\u4ec0\u4e48\uff0c\u53ef\u4ee5\u53c2\u8003\u4e0b\u9762\u7684\u6587\u7ae0\uff0c\u6709\u8be6\u7ec6\u7684\u89e3\u91ca\uff1a <\/p>\n<div style=\"background-color:#FFFDE7; padding-top: 10px; padding-bottom: 10px; padding-right: 10px; padding-left: 20px; border: 2.5px dashed #FFB74D; border-radius:20px;\"> <span style=\"color:#ff951b\">\u27a4<\/span><strong>\u67e5\u770b\uff1a<\/strong><a href=\"https:\/\/physigeek.com\/cn\/\u7b2c\u4e00\u5e73\u8861\u6761\u4ef6\/\">\u7b2c\u4e00\u4e2a\u5e73\u8861\u6761\u4ef6\u662f\u4ec0\u4e48<\/a><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Ejercicios-resueltos-de-la-segunda-condicion-de-equilibrio\"><\/span>\u5df2\u89e3\u51b3\u7b2c\u4e8c\u4e2a\u5e73\u8861\u6761\u4ef6\u7684\u7ec3\u4e60<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3 class=\"wp-block-heading\">\u7ec3\u4e601<\/h3>\n<p>\u8ba1\u7b97\u4ee5\u4e0b\u6881\u7684\u652f\u6491\u5fc5\u987b\u4f7f\u5176\u5904\u4e8e\u65cb\u8f6c\u5e73\u8861\u7684\u529b\u77e9\uff1a <\/p>\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/uploads\/2023\/09\/exercice-resolu-deuxieme-condition-dequilibre.png\" alt=\"\u89e3\u51b3\u4e86\u7b2c\u4e8c\u4e2a\u5e73\u8861\u6761\u4ef6\u7684\u6267\u884c\" class=\"wp-image-397\" width=\"237\" height=\"203\" srcset=\"https:\/\/physigeek.com\/wp-content\/uploads\/2023\/09\/exercice-resolu-deuxieme-condition-dequilibre-300x257.png 300w, https:\/\/physigeek.com\/wp-content\/uploads\/2023\/09\/exercice-resolu-deuxieme-condition-dequilibre.png 643w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\"><\/figure>\n<\/div>\n<div class=\"wp-block-otfm-box-spoiler-start otfm-sp__wrapper otfm-sp__box js-otfm-sp-box__closed otfm-sp__FFF8E1\" role=\"button\" tabindex=\"0\" aria-expanded=\"false\" data-otfm-spc=\"#FFF8E1\" style=\"text-align:center\">\n<div class=\"otfm-sp__title\"><strong>\u67e5\u770b\u89e3\u51b3\u65b9\u6848<\/strong><\/div>\n<\/div>\n<p class=\"has-text-align-left\">\u4e3a\u4e86\u4f7f\u6881\u5904\u4e8e\u65cb\u8f6c\u5e73\u8861\u5e76\u56e0\u6b64\u6ee1\u8db3\u7b2c\u4e8c\u5e73\u8861\u6761\u4ef6\uff0c\u652f\u6491\u4ef6\u5fc5\u987b\u62b5\u6d88\u7531\u529b\u4ea7\u751f\u7684\u626d\u8f6c\u529b\u77e9\uff0c\u56e0\u6b64\u529b\u77e9\u4e4b\u548c\u5c06\u4e3a\u96f6\u3002<\/p>\n<p class=\"has-text-align-left\">\u56e0\u6b64\uff0c\u6211\u4eec\u8ba1\u7b97\u652f\u6491\u6c34\u5e73\u5904\u7684\u529b\u4ea7\u751f\u7684\u529b\u77e9\uff08\u6216\u626d\u77e9\uff09\uff1a<\/p>\n<p class=\"has-text-align-center\">\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/ql-cache\/quicklatex.com-e172a3bbd51bb42bd229d9a88df0a167_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"M_{force}=13\\cdot 9 = 117 \\ Nm\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"202\" style=\"vertical-align: -6px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-left\"> \u73b0\u5728\u6211\u4eec\u63d0\u51fa\u529b\u77e9\u5e73\u8861\u65b9\u7a0b\uff1a<\/p>\n<p class=\"has-text-align-center\">\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/ql-cache\/quicklatex.com-fdac8512edbbe2c1b6396ee43a776261_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"M_{support}+M_{force}=0\" title=\"Rendered by QuickLaTeX.com\" height=\"18\" width=\"170\" style=\"vertical-align: -6px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-left\"> \u4ea7\u751f\u529b\u7684\u529b\u77e9\u901a\u8fc7\u5c4f\u5e55\u5185\u90e8\uff0c\u56e0\u6b64\u5176\u7b26\u53f7\u4e3a\u8d1f\uff1a<\/p>\n<p class=\"has-text-align-center\">\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/ql-cache\/quicklatex.com-b654ae9d3ab78a23e2f7235a7742a503_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"M_{support}-117=0\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"145\" style=\"vertical-align: -6px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-left\"> \u6700\u540e\uff0c\u6211\u4eec\u6c42\u89e3\u65b9\u7a0b\u4e2d\u7684\u672a\u77e5\u6570\uff1a<\/p>\n<p class=\"has-text-align-center\">\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/ql-cache\/quicklatex.com-772409bbbd945be3fc433e503b43e540_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"M_{support}=117 \\ Nm\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"152\" style=\"vertical-align: -6px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-left\"> \u83b7\u5f97\u7684\u8109\u51b2\u5177\u6709\u6b63\u53f7\uff0c\u56e0\u6b64\u5176\u65b9\u5411\u671d\u5411\u5c4f\u5e55\u5916\u4fa7\u3002<\/p>\n<div class=\"wp-block-otfm-box-spoiler-end otfm-sp_end\"><\/div>\n<h3 class=\"wp-block-heading\">\u7ec3\u4e602<\/h3>\n<p>\u5982\u4e0b\u56fe\u6240\u793a\uff0c\u4e00\u6839 10 m \u7684\u5355\u6760\u652f\u6491\u7740\u4e00\u4e2a\u8d28\u91cf\u4e3a 8 kg \u7684\u7269\u4f53\u3002\u77e5\u9053\u652f\u67b6\u4e0e\u60ac\u6d6e\u4f53\u4e4b\u95f4\u7684\u8ddd\u79bb\uff0c\u5982\u679c\u7cfb\u7edf\u5904\u4e8e\u65cb\u8f6c\u548c\u5e73\u79fb\u5e73\u8861\uff0c\u652f\u67b6\u6240\u65bd\u52a0\u7684\u529b\u7684\u503c\u662f\u591a\u5c11\uff1f <\/p>\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/uploads\/2023\/09\/probleme-dequilibre-de-rotation.png\" alt=\"\u65cb\u8f6c\u5e73\u8861\u95ee\u9898\" class=\"wp-image-355\" width=\"339\" height=\"120\" srcset=\"https:\/\/physigeek.com\/wp-content\/uploads\/2023\/09\/probleme-dequilibre-de-rotation-300x107.png 300w, https:\/\/physigeek.com\/wp-content\/uploads\/2023\/09\/probleme-dequilibre-de-rotation.png 643w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\"><\/figure>\n<\/div>\n<div class=\"wp-block-otfm-box-spoiler-start otfm-sp__wrapper otfm-sp__box js-otfm-sp-box__closed otfm-sp__FFF8E1\" role=\"button\" tabindex=\"0\" aria-expanded=\"false\" data-otfm-spc=\"#FFF8E1\" style=\"text-align:center\">\n<div class=\"otfm-sp__title\"><strong>\u67e5\u770b\u89e3\u51b3\u65b9\u6848<\/strong><\/div>\n<\/div>\n<p class=\"has-text-align-left\">\u9996\u5148\uff0c\u6211\u4eec\u4f7f\u7528\u91cd\u529b\u516c\u5f0f\u6765\u8ba1\u7b97\u5355\u6760\u5fc5\u987b\u652f\u6491\u7684\u91cd\u91cf\uff1a<\/p>\n<p class=\"has-text-align-center\">\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/ql-cache\/quicklatex.com-eb480f5d32a9e25cefacd5f89d407580_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"P=m\\cdot g=8\\cdot 9,81 =78,48 \\ N\" title=\"Rendered by QuickLaTeX.com\" height=\"17\" width=\"244\" style=\"vertical-align: -4px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-left\"> \u56e0\u6b64\uff0c\u7cfb\u7edf\u7684\u81ea\u7531\u4f53\u56fe\u4e3a\uff1a <\/p>\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/uploads\/2023\/09\/exercice-resolu-rotation-equilibre.png\" alt=\"\u65cb\u8f6c\u5e73\u8861\u7ec3\u4e60\u5df2\u89e3\u51b3\" class=\"wp-image-356\" width=\"340\" height=\"297\" srcset=\"https:\/\/physigeek.com\/wp-content\/uploads\/2023\/09\/exercice-resolu-rotation-equilibre-300x261.png 300w, https:\/\/physigeek.com\/wp-content\/uploads\/2023\/09\/exercice-resolu-rotation-equilibre.png 654w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\"><\/figure>\n<\/div>\n<p class=\"has-text-align-left\">\u95ee\u9898\u9648\u8ff0\u544a\u8bc9\u6211\u4eec\u7cfb\u7edf\u5904\u4e8e\u529b\u5e73\u8861\u72b6\u6001\uff0c\u56e0\u6b64\u6240\u6709\u8fd9\u4e9b\u529b\u7684\u603b\u548c\u5fc5\u987b\u4e3a\u96f6\u3002\u5229\u7528\u8fd9\u4e2a\u5e73\u8861\u6761\u4ef6\uff0c\u6211\u4eec\u53ef\u4ee5\u5236\u5b9a\u4ee5\u4e0b\u65b9\u7a0b\uff1a<\/p>\n<p class=\"has-text-align-center\">\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/ql-cache\/quicklatex.com-635096a57ce10781254f283c9807f64c_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"F_A+F_B-P=0\" title=\"Rendered by QuickLaTeX.com\" height=\"15\" width=\"136\" style=\"vertical-align: -3px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-left\"> \u53e6\u4e00\u65b9\u9762\uff0c\u8be5\u9648\u8ff0\u4e5f\u544a\u8bc9\u6211\u4eec\u7cfb\u7edf\u5904\u4e8e\u52a8\u91cf\u5e73\u8861\u72b6\u6001\u3002\u56e0\u6b64\uff0c\u5982\u679c\u6211\u4eec\u8003\u8651\u7cfb\u7edf\u4e2d\u4efb\u610f\u70b9\u7684\u529b\u77e9\u603b\u548c\uff0c\u7ed3\u679c\u5fc5\u5b9a\u4e3a\u96f6\uff0c\u5982\u679c\u6211\u4eec\u91c7\u7528\u4e24\u4e2a\u652f\u6491\u4e4b\u4e00\u7684\u53c2\u8003\u70b9\uff0c\u6211\u4eec\u5c06\u5f97\u5230\u4e00\u4e2a\u53ea\u6709\u4e00\u4e2a\u672a\u77e5\u6570\u7684\u65b9\u7a0b\uff1a<\/p>\n<p class=\"has-text-align-center\">\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/ql-cache\/quicklatex.com-f1a6d56c3426e8d6c2e890b5e8f4a873_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"M(A)=0\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"79\" style=\"vertical-align: -5px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-center\">\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/ql-cache\/quicklatex.com-922d5ff929e034db7a9e80d732b0b893_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"-P\\cdot 6.5+F_B\\cdot (6.5+3.5)=0\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"233\" style=\"vertical-align: -5px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-left\">\u73b0\u5728\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u6c42\u89e3\u65b9\u7a0b\u4e2d\u7684\u672a\u77e5\u6570\u6765\u8ba1\u7b97\u652f\u6491 B \u65bd\u52a0\u7684\u529b\uff1a <\/p>\n<p class=\"has-text-align-center\">\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/ql-cache\/quicklatex.com-95596edf27bb6086c35473f55465416d_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"-78.48\\cdot 6.5+F_B\\cdot 10=0\" title=\"Rendered by QuickLaTeX.com\" height=\"16\" width=\"197\" style=\"vertical-align: -3px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-center\">\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/ql-cache\/quicklatex.com-953185a6ad4824b654b8a40e259bbd71_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"F_B=\\cfrac{78.48\\cdot 6.5}{10}\" title=\"Rendered by QuickLaTeX.com\" height=\"39\" width=\"125\" style=\"vertical-align: -12px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-center\">\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/ql-cache\/quicklatex.com-c5459080e5aa468fa3d77a16a2b0d9b9_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"F_B=51.01\\N\" title=\"Rendered by QuickLaTeX.com\" height=\"16\" width=\"87\" style=\"vertical-align: -3px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-left\">\u6700\u540e\uff0c\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u5c06\u83b7\u5f97\u7684\u503c\u4ee3\u5165\u5782\u76f4\u529b\u7684\u9ad8\u65b9\u7a0b\u6765\u77e5\u9053\u65bd\u52a0\u5728\u53e6\u4e00\u4e2a\u652f\u6491\u4e0a\u7684\u529b\u7684\u5f3a\u5ea6\uff1a <\/p>\n<p class=\"has-text-align-center\">\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/ql-cache\/quicklatex.com-635096a57ce10781254f283c9807f64c_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"F_A+F_B-P=0\" title=\"Rendered by QuickLaTeX.com\" height=\"15\" width=\"136\" style=\"vertical-align: -3px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-center\">\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/ql-cache\/quicklatex.com-36325128977806ddaca1436ffb68dcd4_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"F_A+51,01-78,48=0\" title=\"Rendered by QuickLaTeX.com\" height=\"17\" width=\"185\" style=\"vertical-align: -4px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-center\">\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/ql-cache\/quicklatex.com-5ecd2d608e61435093289d17c242e21f_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"F_A=27,47\\N\" title=\"Rendered by QuickLaTeX.com\" height=\"17\" width=\"90\" style=\"vertical-align: -4px;\"><\/p>\n<\/p>\n<div class=\"wp-block-otfm-box-spoiler-end otfm-sp_end\"><\/div>\n","protected":false},"excerpt":{"rendered":"<p>\u672c\u6587\u89e3\u91ca\u4e86\u7b2c\u4e8c\u4e2a\u5e73\u8861\u6761\u4ef6\u662f\u4ec0\u4e48\u53ca\u5176\u7ec4\u6210\u3002\u60a8\u8fd8\u5c06\u627e\u5230\u7b2c\u4e8c\u4e2a\u5e73\u8861\u6761\u4ef6\u7684\u771f\u5b9e\u793a\u4f8b\uff0c\u6700\u540e\uff0c\u60a8\u5c06\u80fd\u591f\u901a\u8fc7\u9010\u6b65\u89e3\u51b3\u7684\u7ec3\u4e60\u8fdb &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"https:\/\/physigeek.com\/cn\/%e7%ac%ac%e4%ba%8c%e4%b8%aa%e5%b9%b3%e8%a1%a1%e6%9d%a1%e4%bb%b6\/\"> <span class=\"screen-reader-text\">\u7b2c\u4e8c\u4e2a\u5e73\u8861\u6761\u4ef6<\/span> \u67e5\u770b\u5168\u6587 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