{"id":247,"date":"2023-06-23T09:26:11","date_gmt":"2023-06-23T09:26:11","guid":{"rendered":"https:\/\/physigeek.com\/cn\/%e6%b3%95%e5%90%91%e5%8a%9b\/"},"modified":"2023-06-23T09:26:11","modified_gmt":"2023-06-23T09:26:11","slug":"%e6%b3%95%e5%90%91%e5%8a%9b","status":"publish","type":"post","link":"https:\/\/physigeek.com\/cn\/%e6%b3%95%e5%90%91%e5%8a%9b\/","title":{"rendered":"\u6b63\u5e38\u5f3a\u5ea6"},"content":{"rendered":"<p>\u672c\u6587\u89e3\u91ca\u4e86\u4ec0\u4e48\u662f\u6cd5\u5411\u529b\u4ee5\u53ca\u5982\u4f55\u6839\u636e\u95ee\u9898\u7684\u7c7b\u578b\u786e\u5b9a\u6cd5\u5411\u529b\u3002\u8fd9\u6837\u4f60\u5c31\u4f1a\u53d1\u73b0\u6cd5\u5411\u529b\u7684\u7279\u70b9\uff0c\u5e76\u4e14\u80fd\u591f\u901a\u8fc7\u9010\u6b65\u89e3\u51b3\u7684\u7ec3\u4e60\u6765\u7ec3\u4e60\u8fd9\u79cd\u529b\u3002 <\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%C2%BFQue-es-la-fuerza-normal\"><\/span>\u4ec0\u4e48\u662f\u6cd5\u5411\u529b\uff1f<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>\u5728\u7269\u7406\u5b66\u4e2d\uff0c<strong>\u6cd5\u5411\u529b<\/strong>\u662f\u8868\u9762\u65bd\u52a0\u5728\u5176\u4e0a\u7684\u7269\u4f53\u4e0a\u7684\u529b\u3002\u56e0\u6b64\uff0c\u6cd5\u5411\u529b\u7684\u65b9\u5411\u5782\u76f4\u4e8e\u8868\u9762\uff0c\u4e14\u6cd5\u5411\u529b\u7684\u65b9\u5411\u662f\u5411\u5916\u7684\uff0c\u5373\u8868\u9762\u5411\u672c\u4f53\u65bd\u52a0\u6cd5\u5411\u529b\u3002<\/p>\n<p>\u4e00\u822c\u6765\u8bf4\uff0c\u6cd5\u5411\u529b\u7528\u4e8e\u62b5\u6d88<a href=\"https:\/\/physigeek.com\/cn\/\u8eab\u4f53\u91cd\u91cf\/\">\u91cd\u529b<\/a>\uff0c\u91cd\u529b\u662f\u5730\u7403\u5bf9\u4efb\u4f55\u6709\u8d28\u91cf\u7684\u7269\u4f53\u65bd\u52a0\u7684\u5f15\u529b\u3002\u7136\u800c\uff0c\u5f53\u8eab\u4f53\u653e\u7f6e\u5728\u503e\u659c\u8868\u9762\u4e0a\u65f6\uff0c\u6cd5\u5411\u529b\u7684\u503c\u53ef\u80fd\u4e0d\u591f\u3002\u4e0b\u9762\u6211\u4eec\u5c06\u4e86\u89e3\u5982\u4f55\u8ba1\u7b97\u659c\u9762\u4e0a\u7684\u6cd5\u5411\u529b\u3002<\/p>\n<p>\u7b80\u800c\u8a00\u4e4b\uff0c<strong><u style=\"text-decoration-color:#4fd12f\">\u6cd5\u5411\u529b\u7684\u7279\u70b9<\/u><\/strong>\u662f\uff1a<\/p>\n<ul style=\"color:#4fd12f; font-weight: bold;\">\n<li style=\"margin-bottom:12px\"><span style=\"color:#101010;font-weight: normal;\">\u6cd5\u5411\u529b\u662f\u63a5\u89e6\u529b\uff0c\u4e5f\u5c31\u662f\u8bf4\uff0c\u53ea\u6709\u4e24\u4e2a\u8868\u9762\u63a5\u89e6\u65f6\u624d\u80fd\u65bd\u52a0\u6cd5\u5411\u529b\u3002<\/span><\/li>\n<li style=\"margin-bottom:12px\"><span style=\"color:#101010;font-weight: normal;\">\u6cd5\u5411\u529b\u7684\u65b9\u5411\u5782\u76f4\u4e8e\u7269\u4f53\u6240\u5728\u7684\u8868\u9762\u3002<\/span><\/li>\n<li style=\"margin-bottom:12px\"><span style=\"color:#101010;font-weight: normal;\">\u6cd5\u5411\u529b\u7684\u65b9\u5411\u59cb\u7ec8\u5411\u5916\uff0c\u56e0\u4e3a\u662f\u5c06\u6cd5\u5411\u529b\u65bd\u52a0\u5230\u4e3b\u4f53\u7684\u8868\u9762\u3002<\/span><\/li>\n<li style=\"margin-bottom:12px\"><span style=\"color:#101010;font-weight: normal;\">\u4e00\u822c\u6765\u8bf4\uff0c\u6cd5\u5411\u529b\u7684\u5927\u5c0f\u76f8\u5f53\u4e8e\u5408\u529b\u6295\u5c04\u5230\u652f\u6491\u8868\u9762\u4e0a\u3002<\/span><\/li>\n<li><span style=\"color:#101010;font-weight: normal;\">\u901a\u5e38\uff0c\u6cd5\u5411\u529b\u901a\u5e38\u7528\u7b26\u53f7N\u6216<sub>FN<\/sub>\u8868\u793a\u3002<\/span> <\/li>\n<\/ul>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Como-calcular-la-fuerza-normal\"><\/span>\u5982\u4f55\u8ba1\u7b97\u6cd5\u5411\u529b<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>\u4e00\u822c\u6765\u8bf4\uff0c\u8981<strong>\u8ba1\u7b97\u6cd5\u5411\u529b\uff0c<\/strong>\u5fc5\u987b\u5e94\u7528\u5e73\u8861\u65b9\u7a0b\uff0c\u8be5\u65b9\u7a0b\u786e\u5b9a\u5f53\u5782\u76f4\u529b\u4e4b\u548c\u4e0e\u6c34\u5e73\u529b\u4e4b\u548c\u4e3a\u96f6\u65f6\uff0c\u7269\u4f53\u5904\u4e8e\u5e73\u8861\u72b6\u6001\u3002<\/p>\n<p>\u901a\u8fc7\u5c06\u5e73\u8861\u6761\u4ef6\u5e94\u7528\u4e8e\u95ee\u9898\uff0c\u6211\u4eec\u5c06\u80fd\u591f\u4ece\u6240\u63d0\u51fa\u7684\u65b9\u7a0b\u4e2d\u6c42\u89e3\u6cd5\u5411\u529b\uff0c\u4ece\u800c\u786e\u5b9a\u6cd5\u5411\u529b\u7684\u503c\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-a9333695ba02f6e089d628fe3622a2e5_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\begin{array}{c}\\displaystyle\\sum \\vv{F_x}=0\\\\[2ex]\\displaystyle\\sum \\vv{F_y}=0\\end{array}\" title=\"Rendered by QuickLaTeX.com\" height=\"65\" width=\"81\" style=\"vertical-align: 0px;\"><\/p>\n<\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Ejemplo-del-calculo-de-la-fuerza-normal\"><\/span>\u6cd5\u5411\u529b\u8ba1\u7b97\u793a\u4f8b<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>\u73b0\u5728\u6211\u4eec\u77e5\u9053\u4e86\u6cd5\u5411\u529b\u7684\u5b9a\u4e49\uff0c\u8ba9\u6211\u4eec\u770b\u4e00\u4e2a\u8ba1\u7b97\u6cd5\u5411\u529b\u7684\u5177\u4f53\u793a\u4f8b\u3002<\/p>\n<ul>\n<li>\u91cd8\u516c\u65a4\u7684\u8eab\u4f53\u9759\u6b62\u5728\u5e73\u5766\u7684\u5730\u9762\u4e0a\u3002\u5730\u9762\u5bf9\u4eba\u4f53\u65bd\u52a0\u7684\u6cd5\u5411\u529b\u7684\u503c\u662f\u591a\u5c11\uff1f<\/li>\n<\/ul>\n<p>\u5728\u8fd9\u4e2a\u95ee\u9898\u4e2d\uff0c\u7269\u4f53\u9759\u6b62\u5728\u5e73\u5766\u7684\u8868\u9762\u4e0a\uff0c\u56e0\u6b64\u4f5c\u7528\u5728\u5176\u4e0a\u7684\u552f\u4e00\u529b\u662f\u91cd\u529b\u548c\u6cd5\u5411\u529b\u3002 <\/p>\n<figure class=\"wp-block-image aligncenter size-full is-resized\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/uploads\/2023\/09\/force-et-poids-normaux.png\" alt=\"\u6b63\u5e38\u529b\u91cf\u548c\u4f53\u91cd\" class=\"wp-image-4215\" width=\"273\" height=\"297\" srcset=\"https:\/\/physigeek.com\/wp-content\/uploads\/2023\/09\/force-et-poids-normaux-275x300.png 275w, https:\/\/physigeek.com\/wp-content\/uploads\/2023\/09\/force-et-poids-normaux.png 570w\" sizes=\"auto, (max-width: 275px) 100vw, 275px\"><\/figure>\n<p>\u56e0\u6b64\uff0c\u8981\u4f7f\u7269\u4f53\u5728\u5e73\u9762\u4e0a\u4fdd\u6301\u5e73\u8861\uff0c\u6cd5\u5411\u529b (N) \u548c\u91cd\u529b (P) \u5fc5\u987b\u76f8\u7b49\u3002\u56e0\u6b64\uff0c\u6cd5\u7ebf\u548c\u91cd\u91cf\u5177\u6709\u76f8\u540c\u7684\u65b9\u5411\u3001\u76f8\u540c\u7684\u6a21\u6570\uff0c\u4f46\u5b83\u4eec\u7684\u65b9\u5411\u76f8\u53cd\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-318d3aaff48777c13e5ac24cb775f6b0_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"N=P\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"54\" style=\"vertical-align: 0px;\"><\/p>\n<\/p>\n<p>\u56e0\u6b64\uff0c\u8981\u786e\u5b9a\u6cd5\u5411\u529b\u7684\u503c\uff0c\u53ea\u9700\u8ba1\u7b97\u7269\u4f53\u7684\u91cd\u91cf\u5373\u53ef\uff0c\u8be5\u91cd\u91cf\u7b49\u4e8e\u7269\u4f53\u7684\u8d28\u91cf\u4e58\u4ee5\u91cd\u529b\u52a0\u901f\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-a7355a420808c17875e97713c4bef5ec_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"N=P=m\\cdot g=8 \\cdot 9,81 = 78,48 \\ N\" title=\"Rendered by QuickLaTeX.com\" height=\"17\" width=\"283\" style=\"vertical-align: -4px;\"><\/p>\n<\/p>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Fuerza-normal-en-un-plano-inclinado\"><\/span>\u659c\u9762\u4e0a\u7684\u6cd5\u5411\u529b<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>\u5728\u672c\u8282\u4e2d\uff0c\u6211\u4eec\u5c06\u63a8\u5bfc\u659c\u9762\u4e0a\u6cd5\u5411\u529b\u7684\u516c\u5f0f\uff0c\u56e0\u4e3a\u5b83\u7684\u503c\u6839\u636e\u8868\u9762\u662f\u5e73\u5766\u8fd8\u662f\u503e\u659c\u800c\u53d8\u5316\u3002<\/p>\n<p>\u56e0\u6b64\uff0c\u4f5c\u7528\u5728\u503e\u659c\u5e73\u9762\u4e0a\u7684\u7269\u4f53\u4e0a\u7684\u529b\u5982\u4e0b\uff1a <\/p>\n<figure class=\"wp-block-image aligncenter size-large is-resized\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/uploads\/2023\/09\/force-normale-sur-un-plan-incline.png\" alt=\"\u659c\u9762\u4e0a\u7684\u6cd5\u5411\u529b\" class=\"wp-image-4220\" width=\"308\" height=\"417\" srcset=\"https:\/\/physigeek.com\/wp-content\/uploads\/2023\/09\/force-normale-sur-un-plan-incline-222x300.png 222w, https:\/\/physigeek.com\/wp-content\/uploads\/2023\/09\/force-normale-sur-un-plan-incline-757x1024.png 757w, https:\/\/physigeek.com\/wp-content\/uploads\/2023\/09\/force-normale-sur-un-plan-incline-768x1038.png 768w, https:\/\/physigeek.com\/wp-content\/uploads\/2023\/09\/force-normale-sur-un-plan-incline.png 770w\" sizes=\"auto, (max-width: 222px) 100vw, 222px\"><\/figure>\n<p>\u770b\u4e0a\u56fe\uff1a\u5f53\u5e73\u9762\u503e\u659c\u65f6\uff0c\u4ee5\u5e73\u884c\u4e8e\u5e73\u9762\uff08\u8f741\uff09\u7684\u65b9\u5411\u548c\u5782\u76f4\u4e8e\u5e73\u9762\uff08\u8f742\uff09\u7684\u65b9\u5411\u4e3a\u8f74\u6bd4\u8f83\u65b9\u4fbf\u3002\u8fd9\u6837\u5c31\u66f4\u5bb9\u6613\u8868\u8ff0\u5e73\u8861\u65b9\u7a0b\u3002<\/p>\n<p>\u4e3a\u4e86\u8ba1\u7b97<strong>\u659c\u9762\u4e0a\u7684\u6cd5\u5411\u529b\uff0c<\/strong>\u9700\u8981\u5e94\u7528\u5782\u76f4\u4e8e\u659c\u9762\u7684\u8f74\u4e0a\u7684\u5e73\u8861\u6761\u4ef6\uff0c\u56e0\u4e3a\u6211\u4eec\u53ef\u4ee5\u4fdd\u8bc1\u7269\u4f53\u5728\u8be5\u8f74\u4e0a\u5904\u4e8e\u5e73\u8861\u72b6\u6001\uff0c\u800c\u4e0d\u662f\u5728\u5e73\u884c\u4e8e\u5e73\u9762\u7684\u8f74\u4e0a\u5904\u4e8e\u5e73\u8861\u72b6\u6001\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-badff1735c827c6562a4e074ea4b6bd2_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\displaystyle\\sum \\vv{F_2}=0\" title=\"Rendered by QuickLaTeX.com\" height=\"25\" width=\"80\" style=\"vertical-align: -8px;\"><\/p>\n<\/p>\n<p>\u56e0\u6b64\uff0c\u659c\u9762\u4e0a\u7684\u6cd5\u5411\u529b\u7b49\u4e8e\u5782\u76f4\u4e8e\u8be5\u5e73\u9762\u7684\u8f74\u7684\u91cd\u91cf\u5206\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-ea3f790cf878ca23f77405f73a20e7c6_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"N=P_2\" title=\"Rendered by QuickLaTeX.com\" height=\"15\" width=\"58\" style=\"vertical-align: -3px;\"><\/p>\n<\/p>\n<p>\u5782\u76f4\u4e8e\u5e73\u9762\u7684\u8f74\u7684\u91cd\u91cf\u5206\u91cf\u7b49\u4e8e\u91cd\u91cf\u4e58\u4ee5\u5e73\u9762\u503e\u659c\u89d2\u4f59\u5f26\u7684\u516c\u5f0f\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-efeff10487f285abba9d74ee3eba6b45_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"P_2=P\\cdot \\cos(\\alpha)\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"117\" 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-9fe1bc1d3a7fbacecb2ce1ccc1dadc67_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"P_2=m\\cdot g\\cdot \\cos(\\alpha)\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"141\" style=\"vertical-align: -5px;\"><\/p>\n<\/p>\n<p>\u7b80\u800c\u8a00\u4e4b\uff0c<strong>\u659c\u9762\u4e0a\u6cd5\u5411\u529b\u7684\u516c\u5f0f<\/strong>\u8868\u660e\uff0c\u6cd5\u5411\u529b\u7b49\u4e8e\u7269\u4f53\u8d28\u91cf\u4e58\u4ee5\u91cd\u529b\u4e58\u4ee5\u5e73\u9762\u503e\u659c\u89d2\u7684\u4f59\u5f26\uff1a <\/p>\n<figure class=\"wp-block-image aligncenter size-full is-resized\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/uploads\/2023\/09\/formule-de-la-force-normale-dans-un-plan-incline.png\" alt=\"\u659c\u9762\u4e0a\u6cd5\u5411\u529b\u7684\u516c\u5f0f\" class=\"wp-image-4232\" width=\"269\" height=\"92\" srcset=\"https:\/\/physigeek.com\/wp-content\/uploads\/2023\/09\/formule-de-la-force-normale-dans-un-plan-incline-300x102.png 300w, https:\/\/physigeek.com\/wp-content\/uploads\/2023\/09\/formule-de-la-force-normale-dans-un-plan-incline.png 576w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\"><\/figure>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Fuerza-normal-y-fuerza-de-rozamiento\"><\/span>\u6cd5\u5411\u529b\u548c\u6469\u64e6\u529b<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>\u5728\u672c\u8282\u4e2d\uff0c\u6211\u4eec\u5c06\u770b\u5230\u6cd5\u5411\u529b\u548c\u6469\u64e6\u529b\u4e4b\u95f4\u7684\u5173\u7cfb\uff0c\u56e0\u4e3a\u5b83\u4eec\u662f\u6570\u5b66\u4e0a\u76f8\u5173\u7684\u4e24\u79cd\u7c7b\u578b\u7684\u529b\u3002\u4f46\u9996\u5148\uff0c\u60a8\u9700\u8981\u77e5\u9053\u4ec0\u4e48\u662f\u6469\u64e6\u529b\u3002<\/p>\n<p>\u6469\u64e6\u529b\uff08\u6216\u6469\u64e6\u529b\uff09\u662f\u8bd5\u56fe\u5728\u975e\u5149\u6ed1\u8868\u9762\u4e0a\u79fb\u52a8\u7269\u4f53\u65f6\u4ea7\u751f\u7684\u529b\u3002\u56e0\u6b64\uff0c\u6469\u64e6\u529b\u662f\u963b\u788d\u7269\u4f53\u8fd0\u52a8\u7684\u529b\u3002<\/p>\n<p>\u6469\u64e6\u529b\u662f\u6839\u636e\u6cd5\u5411\u529b\u8ba1\u7b97\u7684\u3002\u66f4\u51c6\u786e\u5730\u8bf4\uff0c<strong>\u6469\u64e6\u529b\u7b49\u4e8e\u8868\u9762\u6469\u64e6\u7cfb\u6570\u4e58\u4ee5\u6cd5\u5411\u529b\u3002<\/strong><\/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-b8e2dc6a1180d664163aeb969b289073_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"F_R=\\mu \\cdot N\" title=\"Rendered by QuickLaTeX.com\" height=\"16\" width=\"86\" style=\"vertical-align: -4px;\"><\/p>\n<\/p>\n<p style=\"margin-bottom:5px\">\u91d1\u5b50\uff1a <\/p>\n<ul style=\"color:#4fd12f; font-weight: bold;\">\n<li style=\"margin-bottom:8px\"><span style=\"color:#101010;font-weight: normal;\">\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/ql-cache\/quicklatex.com-5b005ac29604de5f2904d2da7ade0238_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"F_R\" title=\"Rendered by QuickLaTeX.com\" height=\"15\" width=\"22\" style=\"vertical-align: -3px;\"><\/p>\n<p>\u662f\u6469\u64e6\u529b\u3002 <\/span><\/li>\n<li style=\"margin-bottom:8px\"><span style=\"color:#101010;font-weight: normal;\">\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/ql-cache\/quicklatex.com-05d9eae892416bd34247a25207f8b718_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\mu\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"11\" style=\"vertical-align: -4px;\"><\/p>\n<p>\u662f\u6469\u64e6\u7cfb\u6570\u3002<\/span><\/li>\n<li><span style=\"color:#101010;font-weight: normal;\">\n<p class=\"has-text-align-center\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/ql-cache\/quicklatex.com-7354bae77b50b7d1faed3e8ea7a3511a_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"N\" title=\"Rendered by QuickLaTeX.com\" height=\"12\" width=\"16\" style=\"vertical-align: 0px;\"><\/p>\n<p>\u662f\u6b63\u5e38\u7535\u963b\u3002 <\/span><\/li>\n<\/ul>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Ejercicios-resueltos-de-la-fuerza-normal\"><\/span>\u89e3\u51b3\u4e86\u6b63\u5e38\u7684\u529b\u91cf\u7ec3\u4e60<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3 class=\"wp-block-heading\">\u7ec3\u4e601<\/h3>\n<p>\u91cd5\u516c\u65a4\u7684\u8eab\u4f53\u9759\u6b62\u5728\u5e73\u5766\u7684\u5730\u9762\u4e0a\u3002\u5982\u679c\u5728\u7b2c\u4e00\u4e2a\u7269\u4f53\u4e0a\u65b9\u6dfb\u52a0\u53e6\u4e00\u4e2a 3 \u516c\u65a4\u7684\u8d28\u91cf\u7269\u4f53\uff0c\u90a3\u4e48\u5730\u9762\u652f\u6491\u8fd9\u4e24\u4e2a\u7269\u4f53\u7684\u6cd5\u5411\u529b\u662f\u591a\u5c11\uff1f\u6570\u636e\uff1ag=9.81 m\/ <sup>s2<\/sup> \u3002 <\/p>\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\">\u7531\u4e8e\u5730\u9762\u5fc5\u987b\u652f\u6491\u4e24\u4e2a\u7269\u4f53\uff0c\u56e0\u6b64\u6cd5\u5411\u529b\u5c06\u662f\u6bcf\u4e2a\u7269\u4f53\u7684\u91cd\u529b\u4e4b\u548c\u3002\u56e0\u6b64\uff0c\u6211\u4eec\u4f1a\u5148\u8ba1\u7b97\u51fa\u6bcf\u4e2a\u7269\u4f53\u7684\u91cd\u91cf\uff0c\u7136\u540e\u5c06\u5b83\u4eec\u76f8\u52a0\u3002<\/p>\n<p class=\"has-text-align-left\">\u8bf7\u8bb0\u4f4f\uff0c\u91cd\u91cf\u7684\u529b\u662f\u901a\u8fc7\u5c06\u8eab\u4f53\u7684\u8d28\u91cf\u4e58\u4ee5\u91cd\u529b\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-c0cdb663ec9f8fe79fbecd960b50fc39_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"P=m\\cdot g\" title=\"Rendered by QuickLaTeX.com\" height=\"16\" width=\"75\" style=\"vertical-align: -4px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-left\"> \u56e0\u6b64\uff0c\u6211\u4eec\u8ba1\u7b97\u51fa5\u516c\u65a4\u8eab\u4f53\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-a15ef1db0a6608fa8e6165ac0e12e925_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"P_1=5\\cdot 9.81=49.05\\N\" title=\"Rendered by QuickLaTeX.com\" height=\"16\" width=\"160\" style=\"vertical-align: -3px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-left\"> \u5176\u6b21\uff0c\u6211\u4eec\u786e\u5b9a\u8d28\u91cf\u4e3a3\u516c\u65a4\u7684\u7b2c\u4e8c\u4e2a\u7269\u4f53\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-d57016899db324fc0f785e92341e9f2f_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"P_2=3\\cdot 9.81=29.43\\N\" title=\"Rendered by QuickLaTeX.com\" height=\"15\" width=\"161\" style=\"vertical-align: -3px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-left\"> \u56e0\u6b64\uff0c\u901a\u8fc7\u5e94\u7528\u5782\u76f4\u5e73\u8861\u6761\u4ef6\uff0c\u6211\u4eec\u5f97\u5230\u6cd5\u5411\u529b\u7b49\u4e8e\u4e24\u4e2a\u91cd\u91cf\u7684\u603b\u548c\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-c65761c8213d33892f422dd6b0a29121_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\displaystyle\\sum \\vv{F_y}=0\" title=\"Rendered by QuickLaTeX.com\" height=\"25\" width=\"81\" style=\"vertical-align: -8px;\"><\/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-808b8980c7dbb5f2b1cdf14418fea88c_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"N=P_1+P_2\" title=\"Rendered by QuickLaTeX.com\" height=\"15\" width=\"99\" style=\"vertical-align: -3px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-left\">\u7efc\u4e0a\uff0c\u5730\u9762\u6240\u65bd\u52a0\u7684\u6cd5\u5411\u529b\u503c\u4e3a\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-c5819ab4ff951b1edbe6efa0a0111243_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"N=49,05+29,43=78,48 \\ N\" title=\"Rendered by QuickLaTeX.com\" height=\"17\" width=\"237\" style=\"vertical-align: -4px;\"><\/p>\n<\/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\u4e24\u4e2a\u7269\u4f53\u901a\u8fc7\u4e00\u6839\u7ef3\u5b50\u548c\u4e00\u4e2a\u8d28\u91cf\u53ef\u4ee5\u5ffd\u7565\u4e0d\u8ba1\u7684\u6ed1\u8f6e\u8fde\u63a5\u8d77\u6765\u3002\u5982\u679c\u7269\u4f53 2 \u7684\u8d28\u91cf m <sub>2<\/sub> =7 kg\uff0c\u659c\u5761\u7684\u503e\u89d2\u4e3a 50\u00b0\uff0c\u8ba1\u7b97\u659c\u9762\u5bf9\u8d28\u91cf m <sub>1<\/sub>\u7684\u7269\u4f53\u65bd\u52a0\u7684\u6cd5\u5411\u529b\uff0c\u4f7f\u6574\u4e2a\u7cfb\u7edf\u5904\u4e8e\u5e73\u8861\u72b6\u6001\u3002\u5728\u6574\u4e2a\u7ec3\u4e60\u8fc7\u7a0b\u4e2d\u5ffd\u7565\u6469\u64e6\u529b\u3002 <\/p>\n<figure class=\"wp-block-image aligncenter size-full is-resized\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/uploads\/2023\/09\/probleme-dequilibre-des-forces.png\" alt=\"\u5e73\u79fb\u5e73\u8861\u95ee\u9898\" class=\"wp-image-295\" width=\"299\" height=\"240\" srcset=\"https:\/\/physigeek.com\/wp-content\/uploads\/2023\/09\/probleme-dequilibre-des-forces-300x241.png 300w, https:\/\/physigeek.com\/wp-content\/uploads\/2023\/09\/probleme-dequilibre-des-forces.png 718w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\"><\/figure>\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\">\u7269\u4f53 1 \u4f4d\u4e8e\u503e\u659c\u7684\u659c\u5761\u4e0a\uff0c\u56e0\u6b64\u9996\u5148\u8981\u505a\u7684\u662f\u5c06\u5176\u91cd\u91cf\u7684\u529b\u77e2\u91cf\u5316\uff0c\u4f7f\u529b\u4f5c\u7528\u5728\u659c\u5761\u7684\u8f74\u4e0a\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-c05811c44aa2d58295c811d612a54eee_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"P_{1x}=P_1\\cdot \\text{sin}(\\alpha)\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"128\" 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-1a0b77602980cc17cce9b3baef744df8_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"P_{1y}=P_1\\cdot \\text{cos}(\\alpha)\" title=\"Rendered by QuickLaTeX.com\" height=\"20\" width=\"130\" style=\"vertical-align: -6px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-left\">\u56e0\u6b64\uff0c\u4f5c\u7528\u5728\u6574\u4e2a\u7cfb\u7edf\u4e0a\u7684\u4e00\u7ec4\u529b\u662f\uff1a <\/p>\n<figure class=\"wp-block-image aligncenter size-full is-resized\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/physigeek.com\/wp-content\/uploads\/2023\/09\/exercice-resolu-equilibre-des-forces.png\" alt=\"\u5e73\u79fb\u5e73\u8861\u7ec3\u4e60\u5df2\u89e3\u51b3\" class=\"wp-image-296\" width=\"338\" height=\"272\" srcset=\"https:\/\/physigeek.com\/wp-content\/uploads\/2023\/09\/exercice-resolu-equilibre-des-forces-300x241.png 300w, https:\/\/physigeek.com\/wp-content\/uploads\/2023\/09\/exercice-resolu-equilibre-des-forces.png 718w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\"><\/figure>\n<p class=\"has-text-align-left\">\u95ee\u9898\u9648\u8ff0\u544a\u8bc9\u6211\u4eec\uff0c\u529b\u7cfb\u7edf\u5904\u4e8e\u5e73\u8861\u72b6\u6001\uff0c\u56e0\u6b64\u4e24\u4e2a\u7269\u4f53\u5fc5\u987b\u5904\u4e8e\u5e73\u8861\u72b6\u6001\u3002\u6839\u636e\u8fd9\u4e9b\u4fe1\u606f\uff0c\u6211\u4eec\u53ef\u4ee5\u63d0\u51fa\u4e24\u4e2a\u7269\u4f53\u7684\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-b62bbb21cbec2be0bba7f8a839b12ba9_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"1\\ \\rightarrow \\ \\begin{cases}P_{1x}=T\\\\[2ex]P_{1y}=N\\end{cases} \\qquad\\qquad 2 \\ \\rightarrow \\ T=P_2[\/latex ] Par cons\u00e9quent, la composante vectorielle du poids du corps 1 inclin\u00e9 dans le sens de la pente doit \u00eatre \u00e9gale au poids de l'objet 2. [latex]P_{1x}=P_2\" title=\"Rendered by QuickLaTeX.com\" height=\"83\" width=\"1404\" style=\"vertical-align: 0px;\"><\/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-4e1b75b6ba5d7bbe88d23e014eb011c5_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"P_1\\cdot \\text{sin}(\\alpha)=P_2\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"120\" style=\"vertical-align: -5px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-left\">\u6839\u636e\u524d\u9762\u7684\u65b9\u7a0b\uff0c\u6211\u4eec\u53ef\u4ee5\u8ba1\u7b97\u51fa\u7269\u4f53 1 \u7684\u8d28\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-06a53a846ad5bc034f69fa05488404c4_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"m_1\\cdot g \\cdot \\text{sin}(\\alpha) =m_2 \\cdot g\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"174\" 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-802fde26f3388538d766a709d60cf48b_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"m_1 \\cdot \\text{sin}(\\alpha) =m_2\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"130\" 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-16ae359d38a8a11d1b1db4988b8eeaf1_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"m_1 \\cdot \\text{sin}(50\\text{\u00ba}) =7\" title=\"Rendered by QuickLaTeX.com\" height=\"20\" width=\"130\" 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-4249c6e274233595f50eedc1da64f56f_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"m_1 =\\cfrac{7}{\\text{sin}(50\\text{\u00ba})}\" title=\"Rendered by QuickLaTeX.com\" height=\"44\" width=\"111\" style=\"vertical-align: -17px;\"><\/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-6e80f0daabb2167ec2f6622b08001a97_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"m_1=9,14 \\ kg\" title=\"Rendered by QuickLaTeX.com\" height=\"16\" width=\"106\" style=\"vertical-align: -4px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-left\">\u53e6\u4e00\u65b9\u9762\uff0c\u5982\u679c\u6211\u4eec\u67e5\u770b\u7cfb\u7edf\u7684\u529b\u56fe\uff0c\u6211\u4eec\u4f1a\u53d1\u73b0\u6cd5\u5411\u529b\u5fc5\u987b\u7b49\u4e8e\u7269\u4f53 1 \u7684\u91cd\u91cf\u5782\u76f4\u4e8e\u659c\u9762\u7684\u77e2\u91cf\u5206\u91cf\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-82b47c80ab7ef66a41fc4d4425032831_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"P_{1y}=N\" title=\"Rendered by QuickLaTeX.com\" height=\"18\" width=\"66\" style=\"vertical-align: -6px;\"><\/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-56ad7b690b37b3f53ca20597e165860b_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"P_1\\cdot \\text{cos}(\\alpha)=N\" title=\"Rendered by QuickLaTeX.com\" height=\"19\" width=\"120\" style=\"vertical-align: -5px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-left\">\u56e0\u6b64\uff0c\u4ece\u8fd9\u4e2a\u65b9\u7a0b\u6211\u4eec\u53ef\u4ee5\u627e\u5230\u6cd5\u5411\u529b\u7684\u503c\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-f258dccd08d6573f74a2261b2192a92f_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\begin{array}{l}N=P_1\\cdot \\text{cos}(\\alpha)\\\\[3ex]N=m_1 \\cdot g\\cdot \\text{cos}(\\alpha)\\\\[ 3ex]N=9,14 \\cdot 9,81 \\cdot \\text{cos}(50\\text{\u00ba})\\\\[3ex]N=\\bm{57,63 \\ N}\\end{array}[\/ latex]\n\n<div class=&quot;wp-block-otfm-box-spoiler-end otfm-sp_end&quot;><\/div>\n<h3 class=&quot;wp-block-heading&quot;> Exercice 3<\/h3>\n<p> Nous pla\u00e7ons un corps de masse m=2 kg au sommet d&#8217;une rampe avec un angle d&#8217;inclinaison de 30\u00ba. Quel est le coefficient de frottement entre la rampe et le corps si celui-ci est maintenu en \u00e9quilibre ? Donn\u00e9es : g=9,81 m\/s <sup>2<\/sup> <\/p>\n<figure class=&quot;wp-block-image aligncenter size-full is-resized&quot;><img decoding=&quot;async&quot; loading=&quot;lazy&quot; src=&quot;https:\/\/physigeek.com\/wp-content\/uploads\/2023\/09\/probleme-de-force-normale-et-de-force-de-friction.png&quot; alt=&quot;&quot; class=&quot;wp-image-4253&quot; width=&quot;285&quot; height=&quot;176&quot; srcset=&quot;https:\/\/physigeek.com\/wp-content\/uploads\/2023\/09\/probleme-de-force-normale-et-de-force-de-friction-300x185.png 300w, https:\/\/physigeek.com\/wp-content\/uploads\/2023\/09\/probleme-de-force-normale-et-de-force-de-friction.png 702w&quot; sizes=&quot;(max-width: 300px) 100vw, 300px&quot;><\/figure>\n<div class=&quot;wp-block-otfm-box-spoiler-start otfm-sp__wrapper otfm-sp__box js-otfm-sp-box__closed otfm-sp__FFF8E1&quot; role=&quot;button&quot; tabindex=&quot;0&quot; aria-expanded=&quot;false&quot; data-otfm-spc=&quot;#FFF8E1&quot; style=&quot;text-align:center&quot;>\n<div class=&quot;otfm-sp__title&quot;> <strong>Voir la solution<\/strong><\/div>\n<\/div>\n<p> Comme dans tout probl\u00e8me de physique portant sur les forces, la premi\u00e8re chose \u00e0 faire est de dessiner le diagramme du corps libre du syst\u00e8me. Ainsi, toutes les forces qui agissent dans ce syst\u00e8me sont : <\/p>\n<figure class=&quot;wp-block-image aligncenter size-full is-resized&quot;><img decoding=&quot;async&quot; loading=&quot;lazy&quot; src=&quot;https:\/\/physigeek.com\/wp-content\/uploads\/2023\/09\/exercice-resolu-force-normale-et-friction-force.png&quot; alt=&quot;exercice r\u00e9solu de la force normale et de la force de frottement&quot; class=&quot;wp-image-4254&quot; width=&quot;285&quot; height=&quot;333&quot; srcset=&quot;https:\/\/physigeek.com\/wp-content\/uploads\/2023\/09\/exercice-resolu-force-normale-et-friction-force-256x300.png 256w, https:\/\/physigeek.com\/wp-content\/uploads\/2023\/09\/exercice-resolu-force-normale-et-friction-force.png 702w&quot; sizes=&quot;(max-width: 256px) 100vw, 256px&quot;><\/figure>\n<p> Ainsi, pour que le syst\u00e8me soit en \u00e9quilibre, la somme des forces sur les axes 1 et 2 doit \u00eatre \u00e9gale \u00e0 z\u00e9ro. Par cons\u00e9quent, les \u00e9quations suivantes sont vraies : [latex]F_R=P_1&#8243; title=&#8221;Rendered by QuickLaTeX.com&#8221; height=&#8221;454&#8243; width=&#8221;7014&#8243; style=&#8221;vertical-align: 0px;&#8221;><\/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-ea3f790cf878ca23f77405f73a20e7c6_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"N=P_2\" title=\"Rendered by QuickLaTeX.com\" height=\"15\" width=\"58\" style=\"vertical-align: -3px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-left\">\u6211\u4eec\u73b0\u5728\u53ef\u4ee5\u4ece\u7b2c\u4e8c\u4e2a\u65b9\u7a0b\u8ba1\u7b97\u6cd5\u5411\u529b\u7684\u503c\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-780db8c589b96d398e1400444a11db30_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\begin{array}{l}N=P_2\\\\[3ex]N=P\\cdot \\text{cos}(\\alpha)\\\\[3ex]N=m \\cdot g\\cdot \\text{cos }(\\alpha)\\\\[3ex]N=2 \\cdot 9,81 \\cdot \\text{cos}(30\\text{\u00ba})\\\\[3ex]N=16,99 \\ N\\end{array} \" title=\"Rendered by QuickLaTeX.com\" height=\"196\" width=\"171\" style=\"vertical-align: 0px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-left\"> \u53e6\u4e00\u65b9\u9762\uff0c\u6211\u4eec\u4f7f\u7528\u7b2c\u4e00\u4e2a\u65b9\u7a0b\u786e\u5b9a\u6469\u64e6\u529b\u7684\u503c\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-bef5af0f3a7e907aa90f08435f538cf7_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\begin{array}{l}F_R=P_1\\\\[3ex]N=P\\cdot \\text{sin}(\\alpha)\\\\[3ex]F_R=m \\cdot g\\cdot \\text{sin }(\\alpha)\\\\[3ex]F_R=2 \\cdot 9,81 \\cdot \\text{sin}(30\\text{\u00ba})\\\\[3ex]F_R=9,81 \\ N\\end{array} \" title=\"Rendered by QuickLaTeX.com\" height=\"196\" width=\"175\" style=\"vertical-align: 0px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-left\"> \u540c\u6837\uff0c\u6469\u64e6\u529b\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u516c\u5f0f\u4e0e\u6cd5\u5411\u529b\u548c\u6469\u64e6\u7cfb\u6570\u76f8\u5173\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-b8e2dc6a1180d664163aeb969b289073_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"F_R=\\mu \\cdot N\" title=\"Rendered by QuickLaTeX.com\" height=\"16\" width=\"86\" style=\"vertical-align: -4px;\"><\/p>\n<\/p>\n<p class=\"has-text-align-left\"> \u56e0\u6b64\uff0c\u6211\u4eec\u4ece\u65b9\u7a0b\u4e2d\u5220\u9664\u6469\u64e6\u7cfb\u6570\u5e76\u8ba1\u7b97\u5176\u503c\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-2bee3710c7506bf8ff2456662a57f279_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\mu=\\cfrac{F_R}{N}\" title=\"Rendered by QuickLaTeX.com\" height=\"38\" width=\"59\" 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-69da73a9c8ca8ef047563bcb0b957d4b_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\mu=\\cfrac{9,81}{16,99}\" title=\"Rendered by QuickLaTeX.com\" height=\"42\" width=\"80\" style=\"vertical-align: -16px;\"><\/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-87da99c1b6541f3ad374e4ebb3e9daf1_l3.png\" class=\"ql-img-inline-formula quicklatex-auto-format\" alt=\"\\bm{\\mu=0.58}\" title=\"Rendered by QuickLaTeX.com\" height=\"17\" width=\"66\" 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\u4ec0\u4e48\u662f\u6cd5\u5411\u529b\u4ee5\u53ca\u5982\u4f55\u6839\u636e\u95ee\u9898\u7684\u7c7b\u578b\u786e\u5b9a\u6cd5\u5411\u529b\u3002\u8fd9\u6837\u4f60\u5c31\u4f1a\u53d1\u73b0\u6cd5\u5411\u529b\u7684\u7279\u70b9\uff0c\u5e76\u4e14\u80fd\u591f\u901a\u8fc7\u9010\u6b65\u89e3\u51b3\u7684\u7ec3\u4e60 &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"https:\/\/physigeek.com\/cn\/%e6%b3%95%e5%90%91%e5%8a%9b\/\"> <span 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