高一物理题（力学）求详解
\u9ad8\u4e00\u7269\u7406\u529b\u5b66\u9898\uff0c\u6c42\u9ad8\u624b\u89e3\u7b54\uff08\u8be6\u7ec6\u8fc7\u7a0b\uff09\u3000\u3000(1)\u5148\u6c42\u4e59\u706b\u8f66\u7684\u52a0\u901f\u5ea62a*s=v2-o\u4ee3\u6570\u5f972a*200m=20*20\u5f97\u51faa=1m/s2
\u3000\u3000\u5f97\u51fa\u4e59\u8f66\u4ece\u5239\u8f66\u5230\u901f\u5ea6\u8fbe\u52304m/s\u9700\u8981\u7684\u65f6\u95f4t=16s \u6839\u636e\u7684\u516c\u5f0f v=at
\u3000\u3000\u8fd9\u65f6\u5019\u7532\u8f66\u884c\u9a76\u7684\u8ddd\u79bb\u4e3as=vt=4m/s*16s=64m
\u3000\u300064m+125m=185m \u4e59\u8f66\u884c\u9a76\u7684\u8ddd\u79bb\uff1as=vt-1/2at2=192m
\u3000\u3000\u6240\u4ee5\u80fd\u591f\u8ffd\u4e0a\uff01
\u3000\u3000\u6ce8\u610f\uff1a\u7b2c\u4e00\u4e2a\u95ee\u9898\u8003\u8651\u5230\u5fc5\u987b\u662f\u4e59\u8f66\u5230\u8fbe\u7532\u8f66\u7684\u901f\u5ea6\u65f6\u6ca1\u6709\u649e\u4e0a\u624d\u53ef\u4ee5\uff01\u56e0\u4e3a\u7532\u8f66\u505a\u5300\u901f\uff0c\u4e59\u8f66\u505a\u51cf\u901f\uff01\u770b\u7684\u4e0d\u662f\u51cf\u901f\u5230\u96f6\u800c\u662f\u51cf\u901f\u5230\u4ed6\u4eec\u901f\u5ea6\u76f8\u540c\u65f6\uff01\u5728\u540e\u9762\u7684\u65f6\u95f4\u624d\u4e0d\u4f1a\u649e\u4e0a\uff01
\u3000\u3000(2)\u4e0d\u76f8\u649e\u5219\u4e59\u8f66\u901f\u5ea6\u4e0e\u7532\u8f66\u901f\u5ea6\u76f8\u540c\u65f6\u7532\u8f66\u884c\u9a76\u7684\u8ddd\u79bb+125m\u4e0e\u4e59\u8f66\u8ddd\u79bb\u76f8\u7b49\u76f8\u7b49\u4e3a\u4e34\u754c\u72b6\u6001\uff0c
s\u7532=125+V\u7532*t
s\u4e59=s\u7532=\uff0820*20-4*4\uff09/2*a
a=(20-4)/t
\u8054\u89e3\u4ee5\u4e0a\u4e09\u5f0f\u5f97 a=128/125
\u91cd\u529b\u4e3a600N\u7684\u6728\u7bb1\u7f6e\u4e8e\u6c34\u5e73\u5730\u9762\u4e0a\uff0c\u6728\u7bb1\u4e0e\u5730\u9762\u7684\u52a8\u6469\u64e6\u56e0\u6570\u4e3a0.4\uff0c\uff081\uff09\u5f53\u7528\u4e0e\u6c34\u5e73\u65b9\u5411\u621030\u5ea6\u89d2\u659c\u5411\u4e0a\u7684\u62c9\u529b\u62c9\u6728\u7bb1\u5300\u901f\u524d\u8fdb\u65f6\uff1b\uff082\uff09\u5f53\u7528\u4e0e\u6c34\u5e73\u65b9\u5411\u621030\u5ea6\u89d2\u659c\u5411\u4e0b\u7684\u63a8\u529b\u63a8\u6728\u7bb1\u5300\u901f\u524d\u8fdb\u65f6\u3002\u4e24\u6b21\u7528\u529b\u7684\u5927\u5c0f\u5404\u4e3a\u591a\u5c11\uff1f
1.G=600N , u=0.4
\u6b63\u538b\u529bN=G-F*sin30`=G-F/2
\u6469\u64e6\u529bf=u*N
\u5300\u901f\u524d\u8fdb\uff0cf=F*cos30`
u*(G-F/2)=F*\u221a3/2
0.4*(600-F/2)=F*\u221a3/2
F=2400/(5\u221a3+2)N=225.1N
2.N=G+F*sin30`=G+F/2
\u6469\u64e6\u529bf=u*N
\u5300\u901f\u524d\u8fdb\uff0cf=F*cos30`
u*(G+F/2)=F*\u221a3/2
0.4*(600+F/2)=F*\u221a3/2
F=2400/(5\u221a3-2)N=360.4N
2.\u4e00\u8d28\u70b9\u7531\u9759\u6b62\u8d77\u53d7\u529bF1\u4f5c\u7528\u52a0\u901f\u8fd0\u52a8\uff0c\u7ecf\u65f6\u95f4t\u540e\uff0c\u5c06\u529bF1\u64a4\u53bb\uff0c\u7acb\u5373\u52a0\u4e0a\u4e0eF1\u53cd\u5411\u7684\u529bF2\uff0c\u518d\u7ecf\u65f6\u95f4t\uff0c\u8d28\u70b9\u6070\u8fd4\u56de\u51fa\u53d1\u70b9\uff0c\u6c42F1\u4e0eF2\u7684\u6bd4\u503c.
\u6709F1\u4f5c\u7528\u7684\u8fc7\u7a0b\u4e2d:
\u8def\u7a0bS1=1/2*a1*t^2
a1=F1/M
\u53ef\u5f97\u8def\u7a0bS1=(F1*t^2)/(2m)----------[1]
F2\u4f5c\u7528,\u5230\u56de\u5230\u8d77\u59cb\u70b9\u7684\u8fc7\u7a0b\u4e2d:
a2=F2/m
\u4f4d\u79fbS2=Vo*t+1/2*a2*t^2
Vo\u5c31\u662f\u64a4\u6389F1\u65f6\u7684\u901f\u5ea6,Vo=a1*t=F1*t/m
\u56e0\u4e3aS2\u662f\u4f4d\u79fb\u516c\u5f0f,\u8bbe\u4ee5F2\u7684\u65b9\u5411\u4e3a\u6b63\u65b9\u5411
\u6709S2=-Vo*t+1/2*a2*t^2----------[2]
\u53c8S2\u5927\u5c0f=S1\u5927\u5c0f
\u5373[1]=[2]
\u53ef\u5f97\u7ed3\u679cF1:F2=1:3
3.\u4e00\u8f7b\u8d28\u91cf\u5f39\u7c27\u4e0a\u7aef\u56fa\u5b9a\uff0c\u4e0b\u7aef\u6302\u4e00\u91cd\u7269\uff0c\u5e73\u8861\u65f6\u5f39\u7c27\u751f\u957f\u4e864\u5398\u7c73\uff0c\u518d\u5c06\u91cd\u7269\u5411\u4e0b\u62c91\u5398\u7c73\uff0c\u7136\u540e\u653e\u624b\uff0c\u5219\u5728\u521a\u91ca\u653e\u65f6\u7684\u77ac\u95f4\uff0c\u6c42\u91cd\u7269\u7684\u52a0\u901f\u5ea6\uff08g\u53d610m/s^2)
2.5m/s^2,\u65b9\u5411\u5411\u4e0a\u3002
\u5f39\u7c27\u751f\u957f\u4e864\u5398\u7c73\u65f6\u5f39\u529b\u6b63\u597d\u7b49\u4e8e\u7269\u4f53\u81ea\u91cd\u3002
\u800c\u518d\u5728\u6b64\u57fa\u7840\u4e0a\u591a\u4f38\u957f1\u5398\u7c73\u540e\uff0c\u7269\u4f53\u53d7\u5230\u7684\u5408\u529b\u5c31\u7b49\u4e8e1/4\u7684\u81ea\u91cd\uff0c\u6240\u4ee5
a=(1/4 mg)/m=1/4g=2.5m/s^2
4.\u4e00\u4e2a\u505a\u5300\u51cf\u901f\u8fd0\u52a8\u7684\u8d28\u70b9\uff0c\u5b83\u5728\u7b2c\u4e00\u4e2a2\u79d2\u5185\u548c\u7b2c\u4e8c\u4e2a2\u79d2\u5185\u901a\u8fc7\u7684\u4f4d\u79fb\u5206\u522b\u4e3a18\u7c73\u548c14\u7c73\uff0c\u6c42\uff1a
(1)\u8d28\u70b9\u7684\u52a0\u901f\u5ea6\u548c\u521d\u901f\u5ea6\u3002
(2)\u8d28\u70b9\u7ecf\u591a\u5c11\u65f6\u95f4\u505c\u4e0b\u6765\uff1f
\u7528\u4e2d\u95f4\u65f6\u523b\u901f\u5ea6,\u4e5f\u5c31\u662f\u5e73\u5747\u901f\u5ea6\u89e3\u51b3
\u670918/2=9,\u662f\u7b2c\u4e00\u79d2\u7684\u901f\u5ea6(\u56e0\u4e3a\u5300\u51cf\u901f),14/2=7\u662f\u7b2c\u4e09\u79d2\u901f\u5ea6(\u540c\u6837\u7684\u539f\u56e0,\u5982\u679c\u697c\u4e3b\u8fd8\u662f\u4e0d\u6e05\u695a\u8bf7\u7559\u8a00\u7ed9\u6211)
\u7136\u540e\u6709(9-7)/2=1,\u52a0\u901f\u5ea6\u5c31\u662f1
\u521d\u901f\u5ea6\u5c31\u662f9+1=10
\u65f6\u95f4\u5c31\u662f10
5.\u4e00\u7269\u4f53\u9759\u6b62\u5728\u659c\u9762\u4e0a\uff0c\u5f53\u659c\u9762\u7684\u503e\u89d2\u9010\u6e10\u589e\u5927\u800c\u7269\u4f53\u4ecd\u7136\u9759\u6b62\u5728\u659c\u9762\u4e0a\u65f6
A\u3002\u7269\u4f53\u6240\u53d7\u7684\u91cd\u529b\u548c\u9759\u6469\u64e6\u529b\u7684\u5408\u529b\u9010\u6e10\u589e\u5927
B\u3002\u7269\u4f53\u6240\u53d7\u7684\u91cd\u529b\u548c\u652f\u6301\u529b\u7684\u5408\u529b\u9010\u6e10\u589e\u5927
C\u3002\u7269\u4f53\u6240\u53d7\u7684\u652f\u6301\u529b\u548c\u9759\u6469\u64e6\u529b\u7684\u5408\u529b\u9010\u6e10\u589e\u5927
D\u3002\u7269\u4f53\u6240\u53d7\u7684\u91cd\u529b\uff0c\u652f\u6301\u529b\u548c\u9759\u6469\u64e6\u529b\u7684\u5408\u529b\u9010\u6e10\u589e\u5927
\u5206\u6790\uff1a
\u7269\u4f53\u9759\u6b62\u5728\u659c\u9762\u4e0a\u53d7\u52303\u4e2a\u529b\u7684\u4f5c\u7528\uff1a\u91cd\u529b\uff0c\u652f\u6301\u529b\uff0c\u9759\u6469\u64e6\u529b\u3002
\u4efb\u610f\u4e24\u4e2a\u529b\u7684\u5408\u529b\u5fc5\u5b9a\u4e0e\u7b2c3\u4e2a\u529b\u7b49\u5927\u53cd\u5411\u3002
A.\u8be5\u547d\u9898\u7b49\u4ef7\u4e8e\u7269\u4f53\u6240\u53d7\u7684\u652f\u6301\u529b\u9010\u6e10\u589e\u5927\u3002\uff08\u91cd\u529b\u3001\u9759\u6469\u64e6\u529b\u5408\u529b\u5927\u5c0f\u4e0e\u652f\u6301\u529b\u5927\u5c0f\u76f8\u540c\uff09\u3002\u652f\u6301\u529bN=mgcos\u03b1\uff0c\u6839\u636e\u6570\u5b66\u77e5\u8bc6\uff0c\u503e\u89d2\u53d8\u5927\uff0cN\u5e94\u5f53\u8d8a\u6765\u8d8a\u5c0f\u3002
B.\u8be5\u547d\u9898\u7b49\u4ef7\u4e8e\u9759\u6469\u64e6\u529b\u9010\u6e10\u589e\u5927\u3002\u6839\u636e\u53d7\u529b\u5e73\u8861\u5f97\u51fa\uff0cf=mgsin\u03b1\u3002\u540c\u6837\u6839\u636e\u6570\u5b66\u77e5\u8bc6\uff0c\u53ef\u4ee5\u5f97\u51fa\u9759\u6469\u64e6\u529b\u786e\u5b9e\u8d8a\u6765\u8d8a\u5927\u3002
C.\u8be5\u547d\u9898\u7b49\u4ef7\u4e8e\u91cd\u529b\u8d8a\u6765\u8d8a\u5927\u3002\u663e\u7136\u662f\u9519\u8bef\u7684\u3002
D.\u7269\u4f53\u53d7\u529b\u5e73\u8861\u3002\u5408\u529b\u59cb\u7ec8\u5e94\u5f53\u4e3a0\u3002
6.\u5982\u56fe\u6240\u793a\uff0c\u67d0\u642c\u8fd0\u5de5\u4eba\u7528\u6c34\u5e73\u529bF \u62d6\u7740\u4e00\u5c3e\u7aef\u653e\u6709\u4e00\u6728\u7bb1\u7684\u5e73\u677f\u4ee51m/s\u7684\u901f\u5ea6\u5300\u901f\u8fd0\u52a8\uff0c\u5df2\u77e5\u6728\u7bb1\u548c\u5e73\u677f\u7684\u8d28\u91cf\u90fd\u662f50kg\uff0c\u6728\u7bb1\u3001\u5e73\u677f\u3001\u5730\u9762\u4e4b\u95f4\u7684\u6469\u64e6\u7cfb\u6570\u90fd\u4e3a\u03bc=0.1\uff1b\u67d0\u65f6\u523b\u642c\u8fd0\u5de5\u4eba\u7a81\u7136\u5c06\u6c34\u5e73\u529b\u589e\u5927\u4e8620N\uff0c\u5e76\u4fdd\u6301\u8be5\u529b\u4e0d\u53d8\uff0c\u6728\u7bb1\u7acb\u5373\u4ece\u6c34\u5e73\u677f\u5c3e\u7aef\u6ed1\u843d\uff0c\u5f53\u5de5\u4eba\u53d1\u73b0\u6728\u7bb1\u843d\u5730\u540e\u5df2\u7ecf\u524d\u8fdb\u4e866\u79d2\uff0c\u6b64\u65f6\u6728\u677f\u5c3e\u7aef\u4e0e\u6728\u7bb1\u95f4\u7684\u8ddd\u79bb\u4e3a\u591a\u5c11\uff1f\u4e0d\u8ba1\u5e73\u677f\u539a\u5ea6\uff0c\u6728\u7bb1\u53ef\u89c6\u4e3a\u8d28\u70b9\uff0cg\uff1d10m/s2\uff09
\u7531\u4e8e\u8be5\u7269\u4f53\u505a\u5300\u901f\u8fd0\u52a8
`\u6240\u4ee5\u7269\u4f53\u53d7\u529b\u5e73\u8861\uff0cF=f\u6469=\u0446(M+m)g=100N
`\u5de5\u4eba\u7a81\u7136\u52a0\u529b\u540e\uff0c\u6728\u7bb1\u6389\u843d\uff0c\u6b64\u65f6\u53ea\u53d7\u6469\u64e6\u529b
`f=\u0446mg=50N,a=F/m=1m/s^2(\u65b9\u5411\u4e0e\u8fd0\u52a8\u65b9\u5411\u76f8\u53cd\uff09
`\u5f53\u6728\u7bb1\u505c\u6b62\u8fd0\u52a8\u540e\uff0c\u4e0d\u53d7\u6469\u64e6\u529b\uff0c\u6240\u4ee5\u4e0d\u53cd\u5411\u8fd0\u52a8
`\u53ef\u6c42\u5f97\u8fd0\u52a8\u65f6\u95f4\u4e3av=vo - at \u5f97 t=1s
`\u6240\u4ee5\u6728\u7bb1\u7684\u4f4d\u79fb\u4e3aS2=vot - 1/2at^2 =0.5m
`\u6728\u677f\u6240\u53d7\u7684\u62c9\u529b\u4e3a F\u62c9=100 + 20 =120N
`f\u6469=\u0446Mg=50N\uff0c\u65b9\u5411\u4e0eF\u62c9\u76f8\u53cd
`\u6240\u4ee5\u6728\u677f\u6240\u53d7\u5408\u5916\u529b\u4e3a F\u5408=120-50=70N\uff0ca=F/m=1.4m/s^2
`\u4f4d\u79fbS1=vot + 1/2at^2 =31.2m
`\u6240\u4ee5\u4e24\u7269\u4f53\u76f8\u5dee\u8ddd\u79bb\u4e3a S1-S2=31.2-0.5=30.7m \u3002
7.\u4e00\u7269\u4f53\u9759\u6b62\u5728\u5149\u6ed1\u659c\u9762\u4e0a,\u5f53F\u6cbf\u4ec0\u4e48\u65b9\u5411\u65f6F\u6700\u5c0f,\u6700\u5c0f\u503c\u4e3a\u591a\u5927?F\u662f\u4eba\u4e3a\u7ed9\u7269\u4f53\u65bd\u52a0\u7684\u529b\u3002
\u4ee4F\u548c\u659c\u9762\u7684\u5939\u89d2\u4e3a\u03b1,\u659c\u9762\u548c\u6c34\u5e73\u9762\u7684\u5939\u89d2\u4e3a\u03b8.\u7269\u4f53\u8d28\u91cf\u4e3am\u3002
\u2235\u5728\u659c\u9762\u65b9\u5411\u4e0a\u53d7\u529b\u5e73\u8861\uff0c
\u2234mg\u00b7Sin\u03b8\uff1dF\u00b7Cos\u03b1
\u2234F\uff1d(mg\u00b7Sin\u03b8)\uff0fCos\u03b1
Cos\u03b1\u6700\u5927\u4e3a1\uff0c\u5373\u03b1\uff1d0\u00b0\u65f6\uff1aF\u6700\u5c0f\uff0c
\u6b64\u65f6F\uff1dmg\u00b7Sin\u03b8
8.\u4e00\u6728\u5757\u9759\u6b62\u5728\u6c34\u5e73\u684c\u9762\u4e0a,\u5df2\u77e5\u6728\u5757\u91cdG=20,\u6728\u5757\u4e0e\u684c\u9762\u95f4\u7684\u52a8\u6469\u64e6\u56e0\u6570u=0.4,\u4e14\u6728\u5757\u4e0e\u684c\u9762\u7684\u6700\u5927\u9759\u6469\u64e6\u529b\u7b49\u4e8e\u6ed1\u52a8\u6469\u64e6\u529b.
\u95ee:\u6728\u5757\u5728\u684c\u9762\u4e0a\u6ed1\u52a8\u540e,\u4f7f\u6c34\u5e73\u62c9\u529b\u53d8\u4e3a6N,\u6728\u5757\u53d7\u5230\u7684\u6469\u64e6\u529b\u662f\u591a\u5927?(\u9ad8\u4e00\u7269\u7406\u9898)
\u75311\u53ef\u77e5
\u5757\u91cdG=20 * \u52a8\u6469\u64e6\u56e0\u6570u=0.4, = 8N
\u56e0\u4e3a \u6728\u5757\u4e0e\u684c\u9762\u7684\u6700\u5927\u9759\u6469\u64e6\u529b\u7b49\u4e8e\u6ed1\u52a8\u6469\u64e6\u529b.
\u6240\u4ee5\u75286N\u62c9\u529b\u53bb\u62fd \u662f\u62fd\u4e0d\u52a8\u7684 \u90a3\u4e48\u7269\u4f53\u9759\u6b62\u53d7\u529b\u5e73\u8861
\u5219\u6709 F\u62c9 = f\u6469 = 6N
\u7b49\u4e00\u4e0b
F =un = 20N * 0.4 = 8N
\u6240\u4ee5: F(\u9759) = F(\u52a8)=8N
\u56e0\u4e3aF(\u62c9)=6N
\u6240\u4ee5 F(\u62c9)<F(\u9759)
\u4fdd\u6301\u5e73\u8861
\u6240\u4ee5:F(\u6469) = F(\u62c9)=6N
9.\u91cd15N\u7684\u7269\u4f53\u7531OP\u3001OM\u4e24\u6761\u7ef3\u62c9\u4f4f\uff0cOP\u4e0e\u7ad6\u76f4\u65b9\u5411\u6210\u03b8\u89d2\uff0cOM\u4fdd\u6301\u6c34\u5e73\u3002\u82e5OP\u3001OM\u80fd\u627f\u53d7\u7684\u6700\u5927\u62c9\u529b\u5206\u522b\u4e3a\uff0810\u221a3\uff09N\u548c15N\uff0c\u95ee\u4e3a\u4e86\u4fdd\u6301\u7ef3\u4e0d\u88ab\u62c9\u65ad\uff0c\u03b8\u89d2\u7684\u6700\u5927\u503c\u4e3a\u591a\u5c11\uff1f
\u7b2c\u4e00\u6b65\uff1a
\u5206\u6790\u53d7\u529b\u5e73\u8861\uff0c\u91cd\u7269G\u7531\u4e8e\u5904\u4e8e\u5e73\u8861\u72b6\u6001\uff0c\u6240\u4ee5\u6839\u636e\u725b\u4e09\u5f8b\u5176\u4e0d\u53d7\u529b\u6216\u8005\u5408\u5916\u529b\u4e3a0\u3002\u663e\u7136\u5176\u5e76\u975e\u4e0d\u53d7\u529b\uff0c\u6240\u4ee5\u63a8\u7b97\u5176\u548c\u5916\u529b\u4e3a\u96f6\u3002\u9996\u5148\u5176\u80af\u5b9a\u53d7\u5230\u91cd\u529b\u4f5c\u7528\uff0c\u91cd\u529b\u65b9\u5411\u7ad6\u76f4\u5411\u4e0b\uff0c\u5927\u5c0f\u4e3a15N\u3002\u540c\u7406\u5176\u4fbf\u53d7\u5230\u4e00\u4e2a\u529b\uff0c\u5927\u5c0f\u4e3a15N\uff0c\u65b9\u5411\u4e0e\u91cd\u529b\u76f8\u53cd\uff0c\u5373\u7ad6\u76f4\u5411\u4e0a\u3002\u8fd9\u6837\u8fd9\u4e24\u4e2a\u529b\u4f7f\u4e4b\u5904\u4e8e\u5e73\u8861\u72b6\u6001\u3002
\u7b2c\u4e8c\u6b65\uff1a
\u6570\u503c\u5206\u6790\uff0c\u5176\u5411\u4e0a\u7684\u548c\u91cd\u529b\u5e73\u8861\u7684\u529b\u53ea\u662f\u6765\u81eaOP\u4e0eOM\u4e24\u4e2a\u529b\u7684\u5408\u529b\uff0c\u5c06\u5176\u7528\u5e73\u884c\u56db\u8fb9\u5f62\u6cd5\u5219\u8fdb\u884c\u5206\u89e3\uff0cOM\u4e0e\u5408\u529b\u65b9\u5411\u5782\u76f4\uff0c\u6240\u4ee5\u5176\u6839\u672c\u4e0d\u53d7\u529b\uff0c\u9898\u76ee\u4e2d\u8bf4\u8d77\u627f\u53d7\u7684\u6700\u5927\u62c9\u529b\u4e3a15N\u5b9e\u9645\u4e0a\u662f\u8ff7\u60d1\u9879\u76ee\uff0c\u7eb5\u4f7fOM\u627f\u53d7\u7684\u6700\u5927\u62c9\u529b\u4e3a0\uff0cOM\u7ebf\u4e5f\u4e0d\u4f1a\u62c9\u65ad\u3002\uff08\u4e4b\u6240\u4ee5\u8fd9\u6837\uff0c\u662f\u56e0\u4e3a\u9898\u76ee\u4e2d\u8bf4OM\u4fdd\u6301\u6c34\u5e73\u662f\u7406\u60f3\u72b6\u6001\uff0c\u5b9e\u9645\u4e0a\u4f5c\u4e3a\u7ef3\u5b50\uff0cOM\u4e0d\u53ef\u80fd\u4fdd\u6301\u6c34\u5e73\uff0c\u603b\u662f\u4f1a\u6709\u4e00\u4e2a\u89d2\u5ea6\u7684\uff0c\u6b63\u5982\u6211\u4eec\u4e0d\u8003\u8651\u7a7a\u6c14\u4e2d\u6d6e\u529b\u4e00\u6837\uff0c\u9898\u76ee\u4e0d\u8981\u6c42\u6211\u4eec\u8003\u8651\u8fd9\u4e9b\uff0c\u6211\u5c31\u628a\u5b83\u4e22\u5728\u4e00\u8fb9\u4e0d\u8981\u8003\u8651\uff09
\u7b2c\u4e09\u6b65\uff1a
\u8ba1\u7b97\uff0c\u5269\u4e0b\u7684\u5c31\u5269\u4e0b\u4e09\u89d2\u5b66\u91cc\u9762\u7684\u8ba1\u7b97\u4e86\uff0c\u7eaf\u6570\u5b66\uff0c\u6ca1\u6709\u4efb\u4f55\u7269\u7406\u77e5\u8bc6\u4e86\uff0c\u540c\u6837\u7528\u6781\u9650\u6cd5\uff0c\u5047\u8bbe\u6b64\u65f6OP\u53d7\u5230\u7684\u529b\u4e3a\u6700\u5927\u503c\uff0c10\u221a3N \uff0c\u6570\u503c\u5411\u4e0a\u7684\u529b\u4e3a15N\uff0c\u8ba1\u7b97\u51fa
cos\u03b8=15/\uff0810\u221a3\uff09
=\u221a3/2
\u6b64\u65f6\u03b8=30\u5ea6\uff0c\u95ee\u9898\u5f97\u89e3
10\u3002\u4e00\u4e2a\u5c0f\u7403\u505a\u7ad6\u76f4\u4e0a\u629b\u8fd0\u52a8\uff0c\u5728\u5230\u8fbe\u6700\u9ad8\u70b9\u7684\u6700\u540e1\u79d2\u5185\u4e0a\u5347\u7684\u9ad8\u5ea6\u4e3a\u5c0f\u7403\u4e0a\u5347\u7684\u6700\u5927\u9ad8\u5ea6\u76841/6\uff0c\u5219\u5c0f\u7403\u4e0a\u5347\u7684\u6700\u5927\u9ad8\u5ea6\u548c\u629b\u51fa\u65f6\u7684\u521d\u901f\u5ea6\u5404\u662f\u591a\u5927\uff1f
\u6b64\u65f6\u4e3a\u5230\u8fbe\u6700\u9ad8\u70b9\u7684\u6700\u540e\u4e00\u79d2 \u6700\u9ad8\u70b9\u65f6\u901f\u5ea6\u4e3a0\uff0c\u5982\u679c\u53d6g=10\uff0c\u5219\u6709\u6700\u540e\u4e00\u79d2\u521d\u901f\u5ea6\u4e3a10m/s
\u53c8mgh=1/2 mv2 \uff08\u52a8\u80fd\u5b9a\u7406\uff09
\u5f97h=5m
h=1/6H
\u6240\u4ee5H=30m
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