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
绛旓細瑙o細璁炬枩闈㈤棿鐨勫姩鎽╂摝鍥犳暟涓簎 锛2s鍐呭姞閫熷害涓篴1锛屾挙鍘籉鍚庡姞閫熷害涓篴2锛岋紙1锛夊紑濮嬬殑2s鍐咃紝鐗╀綋鍙楀洓涓姏浣滅敤锛屾按骞矲,绔栫洿鍚戜笅閲嶅姏G=mg锛屾敮鎸佸姏N锛屽拰娌挎枩闈㈡枩鍚戜笅鐨勬懇鎿﹀姏f=uN,灏咶,G鍒嗚В鍒版部鏂滈潰鍜屽瀭鐩存枩闈袱涓柟鍚戜笂锛屽瀭鐩存枩闈㈡柟鍚戞湁锛歂=Gcos37掳+Fsin37掳锛屾部鏂滈潰鏂瑰悜鏈塅cos37掳-Gsin37掳...
绛旓細瑙o細A銆佸閲嶇墿鍙楀姏鍒嗘瀽锛屽彈鍒伴噸鍔涘拰鎷夊姏T锛屾牴鎹钩琛℃潯浠讹紝鏈塗=mg锛屽悓涓鏍圭怀瀛愭媺鍔涘澶勭浉绛夛紝鏁呯怀瀛愬澶╄姳鏉跨殑鎷夊姏涔熺瓑浜巑g锛屾晠A閿欒锛汢銆丏銆佸婊戣疆鍙楀姏鍒嗘瀽锛屽彈鍒扮怀瀛愮殑鍘嬪姏锛堢瓑浜庝袱杈圭怀瀛愭媺鍔涚殑鍚堝姏锛夛紝浠ュ強鏉嗙殑寮瑰姏锛堝悜鍙充笂鏂圭殑鏀寔鍔涳紝鍙湁杩欐牱鎵嶈兘淇濇寔婊戣疆骞宠 锛夛紝濡傚浘 涓ゆ牴缁冲瓙涔嬮棿澶硅涓120搴︼紝鏍...
绛旓細姝ら鐨勬湰璐ㄦ槸鑰冨療鐗涢】绗簩瀹氬緥锛屽彧涓嶈繃杩欐槸娑夊強涓や釜鐗╀綋銆傛柟娉曚竴銆侀殧绂绘硶锛屽垎鍒垎鏋愬皬鐞冨拰妗嗘灦銆1銆佺敱浜庢鏋跺鍦伴潰鐨勫帇鍔涗负0锛屾墍浠ュ厛鍒嗘瀽妗嗘灦銆傚叾鍙楀姏濡傚浘锛氬叾涓璏g涓烘鏋剁殑閲嶅姏锛孎涓哄脊绨у悜涓婄殑鎺ㄥ姏锛岀敱浜庢鏋堕潤姝紝鍥犳鏈夊钩琛℃柟绋嬶細F=Mg---1 2銆佸垎鏋愬皬鐞冿紝鏍规嵁鐗涢】绗笁瀹氬緥锛屽脊绨у灏忕悆鐨勫脊鍔涘悜涓嬶紝...
绛旓細绗簩娆℃媺b锛屽晩鐨勪笅婊戝姏鍜宑缁欎簣鐨勬懇鎿﹀姏鏂瑰悜鐩稿悓锛屼簩鍔涚浉鍔犲ぇ浜巆缁欎簣鐨勬懇鎿﹀姏锛宎浼氫笅婊戙
绛旓細瀵规暣浣撳垎鏋 鍥犱负骞抽潰鍏夋粦 涓鏈塅鐨勪綔鐢ㄤ笅绯荤粺鑲畾椹笂寰鍓嶈繍鍔ㄥ苟涓斾骇鐢熷姞閫熷害锛堟瘡涓墿浣撶殑鍔犻熷害鏄浉鍚岀殑锛屾槑鐧斤紵锛 鍐嶇嫭绔嬪垎鏋怉 鐢变簬瑕佹彁渚涘姞閫熷害 閭d箞A鏀跺埌鐨勫悎鍔涙柟鍚戝繀鐒朵笌鍏跺姞閫熷害鏂瑰悜鐩稿悓 A鏈潵鍚堝姏涓0锛堝彈閲嶅姏锛屾枩闈㈢粰瀹冪殑鏀寔鍔涳紝浠ュ強寮圭哀缁欏畠娌挎枩闈㈠悜涓婄殑寮瑰姏锛夛紝鐜板湪瑕佷娇A鍚戝墠鍔犻燂紝鍙楀姏鍒嗘瀽...
绛旓細鏈ㄥ潡瀵圭悆鐨勫姏 鍒嗚В涓轰袱涓姏 绔栫洿鏂瑰悜鐨勭瓑浜庣悆鐨勯噸鍔汳g 姘村钩鐨勫姏涓庡缁欑悆鐨勫姏鐩哥瓑 鏈ㄥ潡瀵圭悆鐨勫姏鎸囧悜鍦嗗績 閫氳繃杩欎笁涓潯浠 鍙互姹傚嚭姘村钩鏂瑰悜鐨勫姏 灏辨槸F 鑷繁鐢讳釜鍥 鏍规嵁 h R绠楀嚭tan 灏辨槸绔栫洿鍔涘拰姘村钩鍔涚殑姣 绔栫洿涓篗g 姘村钩鍔涘氨鍑烘潵浜 Mg/F=锛圧-h锛/鏍瑰彿涓嬶紙R²-锛圧-h锛²锛 ...
绛旓細1.鍏堟眰鍔犻熷害锛屽姞閫熷害涓2m/s2,ug=a,鎵浠=0.2 2.f=2锛屼絾鏄湪鏉跨殑鏈澶ч潤鎽╂摝鍔涗负1锛屾墍浠ヤ細鏈夋粦鍔紝F鍚=ma=2-1=1锛宎=0.25锛寈=vt+1/2at^2=0.5 3.灏忕墿鍧楃殑浣嶇Щ涓6锛堢敱涓婇潰鐨勯偅涓叕寮忚屽緱鍒帮級锛屾墍浠ョ浉瀵逛綅绉讳负5.5锛屾墍浠ヤ笂闈㈢殑鍐呰兘涓簎mg*5.5,涓11锛屼笅闈㈢殑鍐呰兘涓1*0.5锛屾墍浠ュ姞...
绛旓細asdaaaaqq瑙i噴鏈夐敊璇殑鍦版柟锛欰B鏉嗗湪姘村钩鏂瑰悜涓婂彈澶栧姏浣滅敤锛屾按骞虫柟鍚戝姩閲忚偗瀹氫笉瀹堟亽銆楂樹竴瀵硅繖涓棶棰樿繕涓嶈兘涓ユ牸瑙i噴锛屽彧鑳藉畾鎬ц鏄庡涓嬶細鏉嗗湪鐗╃悊涓婃槸涓嶅彲浼搁暱鐨勬ā鍨嬶紝鎵浠ユ瘡鏃舵瘡鍒籄銆丅灏忕悆鐨勯熷害鍦ㄧ粏鏉嗕笂鐨勫垎閲忎竴瀹氱浉绛 鍏堣C锛欰鐞冨埌杈剧珫鐩存Ы搴曢儴鏃禔B鏉嗗浜庢按骞崇姸鎬侊紝姝ゆ椂A鐞冪殑閫熷害绔栫洿鍚戜笅鍨傜洿浜庣粏鏉...
绛旓細1銆乼=0鏃讹紝F=0锛屾懇鎿﹀姏=0锛岃繃鍘熺偣 2銆佹懇鎿﹀姏灏忎簬鐗╀綋鑷噸杩囩▼涓紝鐗╀綋鍔犻熶笅婊 3銆佹懇鎿﹀姏绛変簬鐗╀綋鑷噸鐬棿锛岀墿浣撳寑閫 4銆佹懇鎿﹀姏蹇呴』瀛樺湪澶т簬鐗╀綋鑷噸鐨勯樁娈碉紝涓轰簡鐗╀綋鍑忛熺洿鑷抽潤姝 5銆佺墿浣撳敖閫熼潤姝㈠悗锛屾懇鎿﹀姏绛変簬鑷噸銆傘傘傜患涓婃墍杩帮紝閫塀
绛旓細骞宠 鏃跺脊绨х殑鍘嬬缉閲忎负x锛屽垯鏈塳x=mg锛屽綋灏忕悆杩愬姩鍒版渶浣庣偣鏃讹紝寮圭哀鐨勫帇缂╅噺涓2x锛屾湁2kx锛峬g锛漨a,鎵浠=g 銆傚脊绨у鍦伴潰鐨勫帇鍔涚瓑浜庡脊绨х殑寮瑰姏锛屽嵆鍘嬪姏N锛2kx锛2mg