{"id":2025,"date":"2022-07-24T10:47:00","date_gmt":"2022-07-24T02:47:00","guid":{"rendered":"http:\/\/www.7mgh.com\/?p=2025"},"modified":"2022-08-22T22:42:46","modified_gmt":"2022-08-22T14:42:46","slug":"%e4%b8%80%e9%81%93%e7%9c%8b%e4%bc%bc%e7%ae%80%e5%8d%95%e7%9a%84%e5%8a%a8%e9%87%8f%e9%a2%98%e7%9b%ae","status":"publish","type":"post","link":"https:\/\/www.7mgh.com\/?p=2025","title":{"rendered":"\u4e00\u9053\u770b\u4f3c\u7b80\u5355\u7684\u52a8\u91cf\u9898."},"content":{"rendered":"\n
\"\"<\/figure>\n\n\n\n

\u5982\u56fe\u6240\u793a\uff0c\u4e00\u9ad8h=1.25m\u3001\u8d28\u91cf$m_b=2kg$\u7684\u6728\u5757B\uff0c\u5728\u4e00\u6c34\u5e73\u5411\u53f3\u7684\u6052\u529bF=3N\u4f5c\u7528\u4e0b\uff0c\u5728\u6c34\u5e73\u5730\u9762\u4e0a\u5411\u53f3\u8fd0\u52a8\u3002\u73b0\u5c06\u4e00\u8d28\u91cf$m_a=1kg$\uff08\u53ef\u89c6\u4e3a\u8d28\u70b9\uff09\u7684\u5c0f\u6ed1\u5757A\u8f7b\u8f7b\u9759\u7f6e\uff08\u76f8\u5bf9\u5730\u9762\u7684\u901f\u5ea6\u4e3a\u96f6\uff09\u4e8e\u6728\u5757B\u4e0a\u8dddB\u5de6\u7aefb=1.00m\u7684\u6c34\u5e73\u9762\u4e0a\uff0c\u4e00\u6bb5\u65f6\u95f4\u540eA\u4eceB\u4e0a\u6ed1\u843d\uff0cA\u521a\u79bb\u5f00B\u7684\u65f6\u523b\uff0cB\u5411\u53f3\u8fd0\u52a8\u7684\u8ddd\u79bb$x_0=1.5m$\uff0c\u5df2\u77e5A\u4e0eB\u95f4\u7684\u52a8\u6469\u64e6\u56e0\u6570\uff0cB\u4e0e\u6c34\u5e73\u5730\u9762\u95f4\u7684\u52a8\u6469\u64e6\u56e0\u6570\u5747\u4e3a\u03bc=0.10\uff0c$g=10m\/s^2$\uff08\u7ed3\u679c\u5747\u4fdd\u75592\u4f4d\u6709\u6548\u6570\u5b57\uff09\u3002<\/p>\n\n\n\n

\u8bf4\u660e\uff1a<\/h5>\n\n\n\n

\u8fd9\u662f\u4e00\u4e2a\u770b\u4f3c\u7b80\u5355\u7684\u9898\u76ee\uff0c\u4f46\u662f\u5927\u591a\u6570\u5b66\u751f\u90fd\u4e0d\u80fd\u5b8c\u5168\u4f5c\u5bf9\uff0c\u5206\u6790\u6765\u5206\u6790\u53bb\uff0c<\/p>\n\n\n\n

\u7b2c\u4e00\u3001\u6211\u4eec\u5bf9\u52a8\u91cf\u7684\u76f4\u89c9\u4e0d\u591f\u654f\u611f\uff0c\u628a\u90a3\u79cd\u5bf9\u76f8\u7b49\u529b\u7684\u51b2\u91cf\u76f4\u89c9\u53d8\u6210\u51c6\u786e\u7684\u76f4\u89c9\u3002<\/p>\n\n\n\n

\u7b2c\u4e8c\u62c5\u5fc3\u81ea\u5df1\u7684\u8ba1\u7b97\u529b\uff0c\u8fd9\u9700\u8981\u9694\u4e09\u5dee\u4e94\u5c31\u7ec3\u4e60\u4e00\u904d\uff0c\u5e76\u6ca1\u6709\u6240\u8c13\u7684\u5929\u624d\u90fd\u662f\u5b70\u80fd\u751f\u5de7\uff0c\u806a\u660e\u7684\u4eba\u4f1a\u6562\u4e8e\u6311\u6218\uff0c\u4e0d\u806a\u660e\u7684\u76f4\u63a5\u653e\u5f03\u3002<\/p>\n\n\n\n

\u89e3\u6790\u8fc7\u7a0b<\/h5>\n\n\n\n

\u7b80\u5355\u7684\u5206\u6790a\u3001b\u7684\u53d7\u529b\u53ef\u4ee5\u5f97\u5230\u5404\u81ea\u7684\u52a0\u901f\u5ea6\uff0c\u7136\u540e\u7528\u52a0\u901f\u548c\u65f6\u95f4\u53bb\u7b97\uff0c\u53d1\u73b0\u6709\u592a\u591a\u672a\u77e5\u91cf\uff0c\u53ea\u80fd\u653e\u5f03\u3002<\/p>\n\n\n\n

$u(m_a+m_b)g=3N$ <\/p>\n\n\n\n

$0.1(1kg+2kg)10m\/s^2=3N$<\/p>\n\n\n\n

\u5f53a\u653e\u5230b\u4e0a\uff0cb\u7684\u6469\u64e6\u529b\u59cb\u7ec8\u548c\u6052\u529b\u5927\u5c0f\u76f8\u7b49\u65b9\u5411\u76f8\u53cd\uff0c\u6240\u4ee5\u6052\u529b\u5bf9b\u901f\u5ea6\u7684\u5f71\u54cd\u4e0d\u53d8\u3002<\/p>\n\n\n\n

\u6240\u4ee5ab\u76f8\u5bf9\u6ed1\u52a8\u7684\u8fc7\u7a0b\u6574\u4f53\u52a8\u91cf\u5b88\u6052\uff0c\u8fd9\u6837\u5c31\u53ef\u4ee5\u964d\u4f4e\u96be\u5ea6\u4e86\u3002<\/p>\n\n\n\n

\u6570\u636e\uff1a <\/strong>$m_a=1kg $\u3001$x_0=1.5m$ \u3001 \u03bc=0.10 \u3001b=1m\u3001 F=3N\u3001 $x_0=1.5m$<\/p>\n\n\n\n

\u5047\u8bbe\uff1a $v_0$\u662fb\u7684\u78b0\u649e\u7684\u521d\u59cb\u901f\u5ea6 \uff0c$v_b$\u662fab\u5206\u79bb\u65f6b\u7684\u901f\u5ea6\u3002$x_a$\u662fa\u76f8\u5bf9\u4e8e\u5730\u9762\u7684\u4f4d\u79fb\uff0c$x_0=1.5m$\u662fb\u76f8\u5bf9\u4e8e\u5730\u9762\u7684\u4f4d\u79fb<\/p>\n\n\n\n

a\u7684\u65b9\u7a0b\u5f0f<\/strong><\/p>\n\n\n\n

$m_b v_0=m_b v_b+ m_a v_a$ …… \u2460<\/p>\n\n\n\n

$um_agx_a=\\frac{1}{2}m_av_a^2$ ……\u2461<\/p>\n\n\n\n

$um_agx_0=\\frac{1}{2}m_bv_0^2-\\frac{1}{2}m_bv_b^2$ …..\u2462<\/p>\n\n\n\n

$x_a=x_0-b$ …….\u2463<\/p>\n\n\n\n

\u65b9\u7a0b\u5217\u597d\u540e\uff0c\u522b\u7740\u6025\u8ba1\u7b97\uff0c\u68c0\u67e5\u4e00\u904d\uff0c\u770b\u770b\u5b57\u6bcd\u6709\u6ca1\u6709\u5e26\u9519\uff0c\u6570\u636e\u6709\u6ca1\u6709\u95ee\u9898\uff0c\u5404\u4e2a\u7269\u7406\u91cf\u4e4b\u95f4\u7684\u5173\u7cfb\u5bf9\u4e0d\u5bf9\uff0c\u6211\u5c31\u7406\u89e3\u9519\u4e86$x_a$\u7684\u610f\u601d\uff0c\u6d6a\u8d39\u4e86\u5f88\u591a\u65f6\u95f4\u3002<\/strong><\/p>\n\n\n\n

\u7136\u540e\u627e\u6700\u5bb9\u6613\u4e0b\u624b\u7684\u5730\u65b9\u53bb\u8ba1\u7b97\u3002<\/p>\n\n\n\n

\u5148\u4ece$x_a=x_0-b$ \uff0c\u8fd9\u91cc\u4e0b\u624b\uff0c\u53d1\u73b0$x_a=0.5m$ <\/p>\n\n\n\n

\u5e26\u5165\u65b9\u7a0b\u2461\uff0c\u5f97\u5230$um_agx_a=\\frac{1}{2}m_av_a^2$ \uff0c$0.1\\times10 \\times0.5=\\frac{1}{2}1v_a^2$<\/p>\n\n\n\n

$v_a=1m\/s$<\/p>\n\n\n\n

\u2462\u4e2d\u7684$x_0$\u7684\u7406\u89e3\u662f\u5173\u952e,\u56e0\u4e3a\u6052\u529b\u548cb\u7684\u6469\u64e6\u529b\u76f8\u7b49\uff0c\u5bf9\u8fd0\u52a8\u7684\u6539\u53d8\u62b5\u6d88\u4e86\uff0c\u6240\u4ee5\u624d\u6210\u7acb\u7684\u3002<\/p>\n\n\n\n

$v_a=1$\u5e26\u5165 \u2460\uff0c\u7136\u540e\u8054\u7acb\u2462<\/p>\n\n\n\n

$2\\times v_0 = 2v_b+1$ …..\u2464<\/p>\n\n\n\n

$um_agx_0=\\frac{1}{2}m_bv_0^2-\\frac{1}{2}m_bv_b^2$ <\/p>\n\n\n\n

$1\\times 1.5=\\frac{1}{2}2v_0^2-\\frac{1}{2}2v_b^2$, \u4e4b\u6240\u4ee5\u8fd9\u6837\u62cd\u677f\uff0c\u5c31\u662f\u60f3\u8ba9\u5b66\u751f\u6570\u636e\u5bf9\u9f50\u3002<\/p>\n\n\n\n

$ 1.5=v_0^2-v_b^2$ …..\u2465<\/p>\n\n\n\n

\u2464\u2465\u8054\u7acb \u9ad8\u4e2d\u9636\u6bb5\u8fd9\u662f\u4e00\u79cd\u975e\u5e38\u5e38\u89c1\u7684\u65b9\u6cd5\uff0c\u8981\u6570\u91cf\u638c\u63e1\uff0c\u5c24\u5176\u662f\u52a8\u91cf\u3002 <\/p>\n\n\n\n

$v_0 -v_b =\\frac {1}{2}$<\/p>\n\n\n\n

$(v_0-v_b)(v_0+v_b)=\\frac{3}{2}$<\/p>\n\n\n\n

\u89e3\u5f97<\/p>\n\n\n\n

$v_o=1.75m\/s$ <\/p>\n\n\n\n

$v_b=1.25m\/s$ a\u79bb\u5f00b\u65f6b\u7684\u901f\u5ea6 <\/p>\n\n\n\n

$ h= \\frac{1}{2}g t^2 $ ,$ 1.25= \\frac{1}{2}10 t^2 $ t=0.5s<\/p>\n\n\n\n

$xa”=v_a\\times 0.5=0.5m$<\/p>\n\n\n\n

a\u79bb\u5f00b\u540e\uff0cb\u51cf\u901f\u8fd0\u52a8\uff0c\u56e0\u4e3a\u51cf\u901f\u662f\u51b2\u91cf\u5f15\u8d77<\/p>\n\n\n\n

$ (F – um_b g)t=m_b v_b^\u201c – m_bv_b$<\/p>\n\n\n\n

$v_b^\u201d=1.5m\/s$<\/p>\n\n\n\n

$x^”=\\frac{1.25+1.5}{2} \\times 0.5 =0.6875$<\/p>\n\n\n\n

<\/p>\n\n\n\n

$s=x_b”-x_a”=0.6785-0.5=0.19m $<\/p>\n","protected":false},"excerpt":{"rendered":"

\u5982\u56fe\u6240\u793a\uff0c\u4e00\u9ad8h=1.25m\u3001\u8d28\u91cf$m_b=2kg$\u7684\u6728\u5757B\uff0c\u5728\u4e00\u6c34\u5e73\u5411\u53f3\u7684\u6052\u529bF=3N\u4f5c\u7528\u4e0b\uff0c\u5728\u6c34\u5e73\u5730\u9762\u4e0a\u5411\u53f3\u8fd0\u52a8\u3002\u73b0\u5c06\u4e00\u8d28\u91cf$m_a=1kg$\uff08\u53ef\u89c6\u4e3a\u8d28\u70b9\uff09\u7684\u5c0f\u6ed1\u5757A\u8f7b\u8f7b\u9759\u7f6e\uff08\u76f8\u5bf9\u5730\u9762\u7684\u901f\u5ea6\u4e3a\u96f6\uff09\u4e8e\u6728\u5757B\u4e0a\u8dddB\u5de6\u7aefb=1.00m\u7684\u6c34\u5e73\u9762\u4e0a\uff0c\u4e00\u6bb5\u65f6\u95f4\u540eA\u4eceB\u4e0a\u6ed1\u843d\uff0cA\u521a\u79bb\u5f00B\u7684\u65f6\u523b\uff0cB\u5411\u53f3\u8fd0\u52a8\u7684\u8ddd\u79bb$x_0=1.5m$\uff0c\u5df2\u77e5A\u4e0eB\u95f4\u7684\u52a8\u6469\u64e6\u56e0\u6570\uff0cB\u4e0e\u6c34\u5e73\u5730\u9762\u95f4\u7684\u52a8\u6469\u64e6\u56e0\u6570\u5747\u4e3a\u03bc=0.10\uff0c$g=10m\/s^2$\uff08\u7ed3\u679c\u5747\u4fdd\u75592\u4f4d\u6709\u6548\u6570\u5b57\uff09\u3002 \u8bf4\u660e\uff1a 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