初三物理知识点总结 九年级物理知识点总结

\u521d\u4e09\u7269\u7406\u77e5\u8bc6\u70b9\u603b\u7ed3

\u7269\u7406\u91cf\uff08\u5355\u4f4d\uff09 \u516c\u5f0f \u5907\u6ce8 \u516c\u5f0f\u7684\u53d8\u5f62
\u901f\u5ea6V\uff08m/S\uff09 v= S\uff1a\u8def\u7a0b/t\uff1a\u65f6\u95f4

\u91cd\u529bG (N\uff09 G=mg m\uff1a\u8d28\u91cf g\uff1a9.8N/kg\u6216\u800510N/kg
\u5bc6\u5ea6\u03c1 \uff08kg/m3\uff09 \u03c1=m/V m\uff1a\u8d28\u91cf V\uff1a\u4f53\u79ef
\u5408\u529bF\u5408 \uff08N\uff09 \u65b9\u5411\u76f8\u540c\uff1aF\u5408=F1+F2
\u65b9\u5411\u76f8\u53cd\uff1aF\u5408=F1\u2014F2 \u65b9\u5411\u76f8\u53cd\u65f6\uff0cF1>F2
\u6d6e\u529bF\u6d6e
(N) F\u6d6e=G\u7269\u2014G\u89c6 G\u89c6\uff1a\u7269\u4f53\u5728\u6db2\u4f53\u7684\u91cd\u529b

\u6d6e\u529bF\u6d6e
(N) F\u6d6e=G\u7269 \u6b64\u516c\u5f0f\u53ea\u9002\u7528
\u7269\u4f53\u6f02\u6d6e\u6216\u60ac\u6d6e
\u6d6e\u529bF\u6d6e
(N) F\u6d6e=G\u6392=m\u6392g=\u03c1\u6db2gV\u6392 G\u6392\uff1a\u6392\u5f00\u6db2\u4f53\u7684\u91cd\u529b
m\u6392\uff1a\u6392\u5f00\u6db2\u4f53\u7684\u8d28\u91cf
\u03c1\u6db2\uff1a\u6db2\u4f53\u7684\u5bc6\u5ea6
V\u6392\uff1a\u6392\u5f00\u6db2\u4f53\u7684\u4f53\u79ef
(\u5373\u6d78\u5165\u6db2\u4f53\u4e2d\u7684\u4f53\u79ef)
\u6760\u6746\u7684\u5e73\u8861\u6761\u4ef6 F1L1= F2L2 F1\uff1a\u52a8\u529b L1\uff1a\u52a8\u529b\u81c2
F2\uff1a\u963b\u529b L2\uff1a\u963b\u529b\u81c2
\u5b9a\u6ed1\u8f6e F=G\u7269
S=h F\uff1a\u7ef3\u5b50\u81ea\u7531\u7aef\u53d7\u5230\u7684\u62c9\u529b
G\u7269\uff1a\u7269\u4f53\u7684\u91cd\u529b
S\uff1a\u7ef3\u5b50\u81ea\u7531\u7aef\u79fb\u52a8\u7684\u8ddd\u79bb
h\uff1a\u7269\u4f53\u5347\u9ad8\u7684\u8ddd\u79bb
\u52a8\u6ed1\u8f6e F= \uff08G\u7269+G\u8f6e\uff09
S=2 h G\u7269\uff1a\u7269\u4f53\u7684\u91cd\u529b
G\u8f6e\uff1a\u52a8\u6ed1\u8f6e\u7684\u91cd\u529b
\u6ed1\u8f6e\u7ec4 F= \uff08G\u7269+G\u8f6e\uff09
S=n h n\uff1a\u901a\u8fc7\u52a8\u6ed1\u8f6e\u7ef3\u5b50\u7684\u6bb5\u6570
\u673a\u68b0\u529fW
\uff08J\uff09 W=Fs F\uff1a\u529b
s\uff1a\u5728\u529b\u7684\u65b9\u5411\u4e0a\u79fb\u52a8\u7684\u8ddd\u79bb
\u6709\u7528\u529fW\u6709
\u603b\u529fW\u603b W\u6709=G\u7269h
W\u603b=Fs \u9002\u7528\u6ed1\u8f6e\u7ec4\u7ad6\u76f4\u653e\u7f6e\u65f6
\u673a\u68b0\u6548\u7387 \u03b7= \u00d7100%

\u529f\u7387P
\uff08w\uff09 P=
W\uff1a\u529f
t\uff1a\u65f6\u95f4
\u538b\u5f3ap
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F\uff1a\u538b\u529b
S\uff1a\u53d7\u529b\u9762\u79ef
\u6db2\u4f53\u538b\u5f3ap
\uff08Pa\uff09 P=\u03c1gh \u03c1\uff1a\u6db2\u4f53\u7684\u5bc6\u5ea6
h\uff1a\u6df1\u5ea6\uff08\u4ece\u6db2\u9762\u5230\u6240\u6c42\u70b9
\u7684\u7ad6\u76f4\u8ddd\u79bb\uff09

\u7269\u7406\u91cf \u5355\u4f4d \u516c\u5f0f
\u540d\u79f0 \u7b26\u53f7 \u540d\u79f0 \u7b26\u53f7
\u8d28\u91cf m \u5343\u514b kg m=pv
\u6e29\u5ea6 t \u6444\u6c0f\u5ea6 \u00b0C
\u901f\u5ea6 v \u7c73\uff0f\u79d2 m/s v=s/t
\u5bc6\u5ea6 p \u5343\u514b\uff0f\u7c73³ kg/m³ p=m/v
\u529b\uff08\u91cd\u529b\uff09 F \u725b\u987f\uff08\u725b\uff09 N G=mg
\u538b\u5f3a P \u5e15\u65af\u5361\uff08\u5e15\uff09 Pa P=F/S
\u529f W \u7126\u8033\uff08\u7126\uff09 J W=Fs
\u529f\u7387 P \u74e6\u7279\uff08\u74e6\uff09 w P=W/t
\u7535\u6d41 I \u5b89\u57f9\uff08\u5b89\uff09 A I=U/R
\u7535\u538b U \u4f0f\u7279\uff08\u4f0f\uff09 V U=IR
\u7535\u963b R \u6b27\u59c6\uff08\u6b27\uff09 R=U/I
\u7535\u529f W \u7126\u8033\uff08\u7126\uff09 J W=UIt
\u7535\u529f\u7387 P \u74e6\u7279\uff08\u74e6\uff09 w P=W/t=UI
\u70ed\u91cf Q \u7126\u8033\uff08\u7126\uff09 J Q=cm(t-t\u00b0)
\u6bd4\u70ed c \u7126\uff0f\uff08\u5343\u514b\u00b0C\uff09 J/(kg\u00b0C)
\u771f\u7a7a\u4e2d\u5149\u901f 3\u00d7108\u7c73\uff0f\u79d2
g 9.8\u725b\u987f\uff0f\u5343\u514b
15\u00b0C\u7a7a\u6c14\u4e2d\u58f0\u901f 340\u7c73\uff0f\u79d2
\u3010\u70ed \u5b66 \u90e8 \u5206\u3011
1\u3001\u5438\u70ed\uff1aQ\u5438\uff1dCm(t\uff0dt0)\uff1dCm\u0394t
2\u3001\u653e\u70ed\uff1aQ\u653e\uff1dCm(t0\uff0dt)\uff1dCm\u0394t
3\u3001\u70ed\u503c\uff1aq\uff1dQ/m
4\u3001\u7089\u5b50\u548c\u70ed\u673a\u7684\u6548\u7387\uff1a \u03b7\uff1dQ\u6709\u6548\u5229\u7528/Q\u71c3\u6599
5\u3001\u70ed\u5e73\u8861\u65b9\u7a0b\uff1aQ\u653e\uff1dQ\u5438
6\u3001\u70ed\u529b\u5b66\u6e29\u5ea6\uff1aT\uff1dt\uff0b273K
\u3010\u7535 \u5b66 \u90e8 \u5206\u3011
1\u3001\u7535\u6d41\u5f3a\u5ea6\uff1aI\uff1dQ\u7535\u91cf/t
2\u3001\u7535\u963b\uff1aR=\u03c1L/S
3\u3001\u6b27\u59c6\u5b9a\u5f8b\uff1aI\uff1dU/R
4\u3001\u7126\u8033\u5b9a\u5f8b\uff1a
\uff081\uff09\u3001Q\uff1dI2Rt\u666e\u9002\u516c\u5f0f)
\uff082\uff09\u3001Q\uff1dUIt\uff1dPt\uff1dUQ\u7535\u91cf\uff1dU2t/R (\u7eaf\u7535\u963b\u516c\u5f0f)
5\u3001\u4e32\u8054\u7535\u8def\uff1a
\uff081\uff09\u3001I\uff1dI1\uff1dI2
\uff082\uff09\u3001U\uff1dU1\uff0bU2
\uff083\uff09\u3001R\uff1dR1\uff0bR2
\uff084\uff09\u3001U1/U2\uff1dR1/R2 (\u5206\u538b\u516c\u5f0f)
\uff085\uff09\u3001P1/P2\uff1dR1/R2
6\u3001\u5e76\u8054\u7535\u8def\uff1a
\uff081\uff09\u3001I\uff1dI1\uff0bI2
\uff082\uff09\u3001U\uff1dU1\uff1dU2
\uff083\uff09\u30011/R\uff1d1/R1\uff0b1/R2 [ R\uff1dR1R2/(R1\uff0bR2)]
\uff084\uff09\u3001I1/I2\uff1dR2/R1(\u5206\u6d41\u516c\u5f0f)
\uff085\uff09\u3001P1/P2\uff1dR2/R1
7\u5b9a\u503c\u7535\u963b\uff1a
\uff081\uff09\u3001I1/I2\uff1dU1/U2
\uff082\uff09\u3001P1/P2\uff1dI12/I22
\uff083\uff09\u3001P1/P2\uff1dU12/U22
8\u7535\u529f\uff1a
\uff081\uff09\u3001W\uff1dUIt\uff1dPt\uff1dUQ (\u666e\u9002\u516c\u5f0f)
\uff082\uff09\u3001W\uff1dI2Rt\uff1dU2t/R (\u7eaf\u7535\u963b\u516c\u5f0f)
9\u7535\u529f\u7387\uff1a
\uff081\uff09\u3001P\uff1dW/t\uff1dUI (\u666e\u9002\u516c\u5f0f)
\uff082\uff09\u3001P\uff1dI2R\uff1dU2/R (\u7eaf\u7535\u963b\u516c\u5f0f)

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V\u6392\u00f7V\u7269=P\u7269\u00f7P\u6db2\uff08F\u6d6e=G\uff09
V\u9732\u00f7V\u6392=P\u6db2-P\u7269\u00f7P\u7269
V\u9732\u00f7V\u7269=P\u6db2-P\u7269\u00f7P\u6db2
V\u6392=V\u7269\u65f6\uff0cG\u00f7F\u6d6e=P\u7269\u00f7P\u6db2
\u7269\u7406\u5b9a\u7406\u3001\u5b9a\u5f8b\u3001\u516c\u5f0f\u8868
\u4e00\u3001\u8d28\u70b9\u7684\u8fd0\u52a8\uff081\uff09------\u76f4\u7ebf\u8fd0\u52a8
1\uff09\u5300\u53d8\u901f\u76f4\u7ebf\u8fd0\u52a8
1.\u5e73\u5747\u901f\u5ea6V\u5e73\uff1ds/t\uff08\u5b9a\u4e49\u5f0f\uff09 2.\u6709\u7528\u63a8\u8bbaVt2-Vo2\uff1d2as
3.\u4e2d\u95f4\u65f6\u523b\u901f\u5ea6Vt/2\uff1dV\u5e73\uff1d(Vt+Vo)/2 4.\u672b\u901f\u5ea6Vt\uff1dVo+at
5.\u4e2d\u95f4\u4f4d\u7f6e\u901f\u5ea6Vs/2\uff1d[(Vo2+Vt2)/2]1/2 6.\u4f4d\u79fbs\uff1dV\u5e73t\uff1dVot+at2/2\uff1dVt/2t
7.\u52a0\u901f\u5ea6a\uff1d(Vt-Vo)/t \uff5b\u4ee5Vo\u4e3a\u6b63\u65b9\u5411\uff0ca\u4e0eVo\u540c\u5411(\u52a0\u901f)a>0\uff1b\u53cd\u5411\u5219a<0\uff5d
8.\u5b9e\u9a8c\u7528\u63a8\u8bba\u0394s\uff1daT2 \uff5b\u0394s\u4e3a\u8fde\u7eed\u76f8\u90bb\u76f8\u7b49\u65f6\u95f4(T)\u5185\u4f4d\u79fb\u4e4b\u5dee\uff5d
9.\u4e3b\u8981\u7269\u7406\u91cf\u53ca\u5355\u4f4d:\u521d\u901f\u5ea6(Vo):m/s\uff1b\u52a0\u901f\u5ea6(a):m/s2\uff1b\u672b\u901f\u5ea6(Vt):m/s\uff1b\u65f6\u95f4(t)\u79d2(s)\uff1b\u4f4d\u79fb(s):\u7c73\uff08m\uff09\uff1b\u8def\u7a0b:\u7c73\uff1b\u901f\u5ea6\u5355\u4f4d\u6362\u7b97\uff1a1m/s=3.6km/h\u3002
\u6ce8\uff1a
(1)\u5e73\u5747\u901f\u5ea6\u662f\u77e2\u91cf;
(2)\u7269\u4f53\u901f\u5ea6\u5927,\u52a0\u901f\u5ea6\u4e0d\u4e00\u5b9a\u5927;
(3)a=(Vt-Vo)/t\u53ea\u662f\u91cf\u5ea6\u5f0f\uff0c\u4e0d\u662f\u51b3\u5b9a\u5f0f;
(4)\u5176\u5b83\u76f8\u5173\u5185\u5bb9\uff1a\u8d28\u70b9\u3001\u4f4d\u79fb\u548c\u8def\u7a0b\u3001\u53c2\u8003\u7cfb\u3001\u65f6\u95f4\u4e0e\u65f6\u523b\u3014\u89c1\u7b2c\u4e00\u518cP19\u3015/s--t\u56fe\u3001v--t\u56fe/\u901f\u5ea6\u4e0e\u901f\u7387\u3001\u77ac\u65f6\u901f\u5ea6\u3014\u89c1\u7b2c\u4e00\u518cP24\u3015\u3002
2)\u81ea\u7531\u843d\u4f53\u8fd0\u52a8
1.\u521d\u901f\u5ea6Vo\uff1d0 2.\u672b\u901f\u5ea6Vt\uff1dgt
3.\u4e0b\u843d\u9ad8\u5ea6h\uff1dgt2/2\uff08\u4eceVo\u4f4d\u7f6e\u5411\u4e0b\u8ba1\u7b97\uff09 4.\u63a8\u8bbaVt2\uff1d2gh
\u6ce8:
(1)\u81ea\u7531\u843d\u4f53\u8fd0\u52a8\u662f\u521d\u901f\u5ea6\u4e3a\u96f6\u7684\u5300\u52a0\u901f\u76f4\u7ebf\u8fd0\u52a8\uff0c\u9075\u5faa\u5300\u53d8\u901f\u76f4\u7ebf\u8fd0\u52a8\u89c4\u5f8b\uff1b
(2)a\uff1dg\uff1d9.8m/s2\u224810m/s2\uff08\u91cd\u529b\u52a0\u901f\u5ea6\u5728\u8d64\u9053\u9644\u8fd1\u8f83\u5c0f,\u5728\u9ad8\u5c71\u5904\u6bd4\u5e73\u5730\u5c0f\uff0c\u65b9\u5411\u7ad6\u76f4\u5411\u4e0b\uff09\u3002
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1.\u4f4d\u79fbs\uff1dVot-gt2/2 2.\u672b\u901f\u5ea6Vt\uff1dVo-gt \uff08g=9.8m/s2\u224810m/s2\uff09
3.\u6709\u7528\u63a8\u8bbaVt2-Vo2\uff1d-2gs 4.\u4e0a\u5347\u6700\u5927\u9ad8\u5ea6Hm\uff1dVo2/2g(\u629b\u51fa\u70b9\u7b97\u8d77\uff09
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\u6ce8:
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(3)\u9664\u516c\u5f0f\u6cd5\u5916\uff0c\u4e5f\u53ef\u7528\u4f5c\u56fe\u6cd5\u6c42\u89e3,\u6b64\u65f6\u8981\u9009\u62e9\u6807\u5ea6,\u4e25\u683c\u4f5c\u56fe;
(4)F1\u4e0eF2\u7684\u503c\u4e00\u5b9a\u65f6,F1\u4e0eF2\u7684\u5939\u89d2(\u03b1\u89d2)\u8d8a\u5927\uff0c\u5408\u529b\u8d8a\u5c0f;
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2.\u725b\u987f\u7b2c\u4e8c\u8fd0\u52a8\u5b9a\u5f8b\uff1aF\u5408\uff1dma\u6216a\uff1dF\u5408/ma{\u7531\u5408\u5916\u529b\u51b3\u5b9a,\u4e0e\u5408\u5916\u529b\u65b9\u5411\u4e00\u81f4}
3.\u725b\u987f\u7b2c\u4e09\u8fd0\u52a8\u5b9a\u5f8b\uff1aF\uff1d-F\u2032{\u8d1f\u53f7\u8868\u793a\u65b9\u5411\u76f8\u53cd,F\u3001F\u2032\u5404\u81ea\u4f5c\u7528\u5728\u5bf9\u65b9\uff0c\u5e73\u8861\u529b\u4e0e\u4f5c\u7528\u529b\u53cd\u4f5c\u7528\u529b\u533a\u522b\uff0c\u5b9e\u9645\u5e94\u7528\uff1a\u53cd\u51b2\u8fd0\u52a8}
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6.\u725b\u987f\u8fd0\u52a8\u5b9a\u5f8b\u7684\u9002\u7528\u6761\u4ef6\uff1a\u9002\u7528\u4e8e\u89e3\u51b3\u4f4e\u901f\u8fd0\u52a8\u95ee\u9898\uff0c\u9002\u7528\u4e8e\u5b8f\u89c2\u7269\u4f53\uff0c\u4e0d\u9002\u7528\u4e8e\u5904\u7406\u9ad8\u901f\u95ee\u9898\uff0c\u4e0d\u9002\u7528\u4e8e\u5fae\u89c2\u7c92\u5b50\u3014\u89c1\u7b2c\u4e00\u518cP67\u3015
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7.\u58f0\u6ce2\u7684\u6ce2\u901f(\u5728\u7a7a\u6c14\u4e2d\uff090\u2103\uff1a332m/s\uff1b20\u2103:344m/s\uff1b30\u2103:349m/s\uff1b(\u58f0\u6ce2\u662f\u7eb5\u6ce2)
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W:\u5916\u754c\u5bf9\u7269\u4f53\u505a\u7684\u6b63\u529f(J)\uff0cQ:\u7269\u4f53\u5438\u6536\u7684\u70ed\u91cf(J)\uff0c\u0394U:\u589e\u52a0\u7684\u5185\u80fd(J)\uff0c\u6d89\u53ca\u5230\u7b2c\u4e00\u7c7b\u6c38\u52a8\u673a\u4e0d\u53ef\u9020\u51fa\u3014\u89c1\u7b2c\u4e8c\u518cP40\u3015\uff5d

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2.\u6c14\u4f53\u5206\u5b50\u8fd0\u52a8\u7684\u7279\u70b9\uff1a\u5206\u5b50\u95f4\u7a7a\u9699\u5927\uff1b\u9664\u4e86\u78b0\u649e\u7684\u77ac\u95f4\u5916\uff0c\u76f8\u4e92\u4f5c\u7528\u529b\u5fae\u5f31\uff1b\u5206\u5b50\u8fd0\u52a8\u901f\u7387\u5f88\u5927
3.\u7406\u60f3\u6c14\u4f53\u7684\u72b6\u6001\u65b9\u7a0b\uff1ap1V1/T1\uff1dp2V2/T2 \uff5bPV/T\uff1d\u6052\u91cf\uff0cT\u4e3a\u70ed\u529b\u5b66\u6e29\u5ea6}

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7\u3001\u5bb6\u5ead\u7535\u8def
8\u3001\u89e6\u7535\uff1a\u4e00\u5b9a\u5f3a\u5ea6\u7684\u7535\u6d41\u901a\u8fc7\u4eba\u4f53\u65f6\u6240\u5f15\u8d77\u7684\u4f24\u5bb3\u4e8b\u6545\u3002
9\u3001\u5b89\u5168\u7528\u7535\u5e38\u8bc6\uff1a\u4e0d\u63a5\u89e6\u7535\u538b\u9ad8\u4e8e36\u4f0f\u7684\u5e26\u7535\u4f53\uff0c\u4e0d\u9760\u8fd1\u9ad8\u538b\u5e26\u7535\u4f53\u3002\u660e\u63d2\u5ea7\u7684\u5b89\u88c5\u5e94\u9ad8\u4e8e\u5730\u97621.8m\uff0c\u7535\u98ce\u6247\u3001\u6d17\u8863\u673a\u7b49\u5bb6\u7528\u7535\u5668\u5e94\u63a5\u5730\u3002

\u901f\u5ea6 \u03c5= S / t 1m / s = 3.6 Km / h
\u58f0\u901f\u03c5= 340m / s
\u5149\u901fC = 3\u00d7108 m /s
\u5bc6\u5ea6 \u03c1= m / V 1 g / c m3 = 103 Kg / m3
\u5408\u529b F = F1 - F2
F = F1 + F2 F1\u3001F2\u5728\u540c\u4e00\u76f4\u7ebf\u7ebf\u4e0a\u4e14\u65b9\u5411\u76f8\u53cd
F1\u3001F2\u5728\u540c\u4e00\u76f4\u7ebf\u7ebf\u4e0a\u4e14\u65b9\u5411\u76f8\u540c
\u538b\u5f3a p = F / S
p =\u03c1g h p = F / S\u9002\u7528\u4e8e\u56fa\u3001\u6db2\u3001\u6c14
p =\u03c1g h\u9002\u7528\u4e8e\u7ad6\u76f4\u56fa\u4f53\u67f1
p =\u03c1g h\u53ef\u76f4\u63a5\u8ba1\u7b97\u6db2\u4f53\u538b\u5f3a
1\u6807\u51c6\u5927\u6c14\u538b = 76 cmHg\u67f1 = 1.01\u00d7105 Pa = 10.3 m\u6c34\u67f1
\u6d6e\u529b \u2460 F\u6d6e = G \u2013 F
\u2461\u6f02\u6d6e\u3001\u60ac\u6d6e\uff1aF\u6d6e = G
\u2462 F\u6d6e = G\u6392 =\u03c1\u6db2g V\u6392
\u2463\u636e\u6d6e\u6c89\u6761\u4ef6\u5224\u6d6e\u529b\u5927\u5c0f \uff081\uff09\u5224\u65ad\u7269\u4f53\u662f\u5426\u53d7\u6d6e\u529b
\uff082\uff09\u6839\u636e\u7269\u4f53\u6d6e\u6c89\u6761\u4ef6\u5224\u65ad\u7269\u4f53\u5904
\u4e8e\u4ec0\u4e48\u72b6\u6001
\uff083\uff09\u627e\u51fa\u5408\u9002\u7684\u516c\u5f0f\u8ba1\u7b97\u6d6e\u529b
\u7269\u4f53\u6d6e\u6c89\u6761\u4ef6\uff08\u524d\u63d0\uff1a\u7269\u4f53\u6d78\u6ca1\u5728\u6db2\u4f53\u4e2d\u4e14\u53ea\u53d7\u6d6e\u529b\u548c\u91cd\u529b\uff09\uff1a
\u2460F\u6d6e\uff1eG\uff08\u03c1\u6db2\uff1e\u03c1\u7269\uff09\u4e0a\u6d6e\u81f3\u6f02\u6d6e \u2461F\u6d6e =G\uff08\u03c1\u6db2 =\u03c1\u7269\uff09\u60ac\u6d6e
\u2462F\u6d6e \uff1c G\uff08\u03c1\u6db2 \uff1c \u03c1\u7269\uff09\u4e0b\u6c89
\u6760\u6746\u5e73\u8861\u6761\u4ef6 F1 L1 = F2 L 2 \u6760\u6746\u5e73\u8861\u6761\u4ef6\u4e5f\u53eb\u6760\u6746\u539f\u7406
\u6ed1\u8f6e\u7ec4 F = G / n
F =\uff08G\u52a8 + G\u7269\uff09/ n
SF = n SG \u7406\u60f3\u6ed1\u8f6e\u7ec4
\u5ffd\u7565\u8f6e\u8f74\u95f4\u7684\u6469\u64e6
n\uff1a\u4f5c\u7528\u5728\u52a8\u6ed1\u8f6e\u4e0a\u7ef3\u5b50\u80a1\u6570
\u529f W = F S = P t 1J = 1N?m = 1W?s
\u529f\u7387 P = W / t = F\u03c5 1KW = 103 W\uff0c1MW = 103KW
\u6709\u7528\u529f W\u6709\u7528 = G h\uff08\u7ad6\u76f4\u63d0\u5347\uff09= F S\uff08\u6c34\u5e73\u79fb\u52a8\uff09= W\u603b \u2013 W\u989d =\u03b7W\u603b
\u989d\u5916\u529f W\u989d = W\u603b \u2013 W\u6709 = G\u52a8 h\uff08\u5ffd\u7565\u8f6e\u8f74\u95f4\u6469\u64e6\uff09= f L\uff08\u659c\u9762\uff09
\u603b\u529f W\u603b= W\u6709\u7528+ W\u989d = F S = W\u6709\u7528 / \u03b7
\u673a\u68b0\u6548\u7387 \u03b7= W\u6709\u7528 / W\u603b
\u03b7=G /\uff08n F\uff09
= G\u7269 /\uff08G\u7269 + G\u52a8\uff09 \u5b9a\u4e49\u5f0f
\u9002\u7528\u4e8e\u52a8\u6ed1\u8f6e\u3001\u6ed1\u8f6e\u7ec4

\u6211\u4e00\u5b66\u4e60\u8d44\u6599
\u7b2c\u5341\u4e00\u7ae0 \u591a\u5f69\u7684\u7269\u8d28\u4e16\u754c
\u4e00\u3001\u5b87\u5b99\u548c\u5fae\u89c2\u4e16\u754c
\u5b87\u5b99\u2192\u94f6\u6cb3\u7cfb\u2192\u592a\u9633\u7cfb\u2192\u5730\u7403
\u7269\u8d28\u7531\u5206\u5b50\u7ec4\u6210\uff1b\u5206\u5b50\u662f\u4fdd\u6301\u7269\u8d28\u539f\u6765\u6027\u8d28\u7684\u4e00\u79cd\u7c92\u5b50\uff1b\u4e00\u822c\u5927\u5c0f\u53ea\u6709\u767e\u4ebf\u5206\u4e4b\u51e0\u7c73(0.3-0.4nm)\u3002
\u7269\u8d28\u4e09\u6001\u7684\u6027\u8d28\uff1a
\u56fa\u4f53\uff1a\u5206\u5b50\u6392\u5217\u7d27\u5bc6\uff0c\u7c92\u5b50\u95f4\u6709\u5f3a\u5927\u7684\u4f5c\u7528\u529b\u3002\u56fa\u4f53\u6709\u4e00\u5b9a\u7684\u5f62\u72b6\u548c\u4f53\u79ef\u3002
\u6db2\u4f53\uff1a\u5206\u5b50\u6ca1\u6709\u56fa\u5b9a\u7684\u4f4d\u7f6e\uff0c\u8fd0\u52a8\u6bd4\u8f83\u81ea\u7531\uff0c\u7c92\u5b50\u95f4\u7684\u4f5c\u7528\u529b\u6bd4\u56fa\u4f53\u7684\u5c0f\uff1b\u6db2\u4f53\u6ca1\u6709\u786e\u5b9a\u7684\u5f62\u72b6\uff0c\u5177\u6709\u6d41\u52a8\u6027\u3002
\u6c14\u4f53\uff1a\u5206\u5b50\u6781\u5ea6\u6563\u4e71\uff0c\u95f4\u8ddd\u5f88\u5927\uff0c\u5e76\u4ee5\u9ad8\u901f\u5411\u56db\u9762\u516b\u65b9\u8fd0\u52a8\uff0c\u7c92\u5b50\u95f4\u4f5c\u7528\u529b\u5fae\u5f31\uff0c\u6613\u88ab\u538b\u7f29\uff0c\u6c14\u4f53\u5177\u6709\u6d41\u52a8\u6027\u3002
\u5206\u5b50\u7531\u539f\u5b50\u7ec4\u6210\uff0c\u539f\u5b50\u7531\u539f\u5b50\u6838\u548c\uff08\u6838\u5916\uff09\u7535\u5b50\u7ec4\u6210\uff08\u548c\u592a\u9633\u7cfb\u76f8\u4f3c\uff09\uff0c\u539f\u5b50\u6838\u7531\u8d28\u5b50\u548c\u4e2d\u5b50\u7ec4\u6210\u3002
\u7eb3\u7c73\u79d1\u6280\uff1a\uff081nm=10 m\uff09\uff0c\u7eb3\u7c73\u5c3a\u5ea6:\uff080.1-100nm\uff09\u3002\u7814\u7a76\u7684\u5bf9\u8c61\u662f\u4e00\u5c0f\u5806\u5206\u5b50\u6216\u5355\u4e2a\u7684\u539f\u5b50\u3001\u5206\u5b50\u3002
\u4e8c\u3001\u8d28\u91cf
\u8d28\u91cf\uff1a\u7269\u4f53\u542b\u6709\u7269\u8d28\u7684\u591a\u5c11\u3002\u8d28\u91cf\u662f\u7269\u4f53\u672c\u8eab\u7684\u4e00\u79cd\u5c5e\u6027\uff0c\u5b83\u7684\u5927\u5c0f\u4e0e\u5f62\u72b6\u3001\u72b6\u6001\u3001\u4f4d\u7f6e\u3001\u6e29\u5ea6\u7b49\u65e0\u5173\u3002\u7269\u7406\u91cf\u7b26\u53f7\uff1am\u3002
\u5355\u4f4d\uff1akg\u3001t\u3001g\u3001mg\u3002
1t=103kg, 1kg=103g, 1g=103mg.
\u5929\u5e73\uff1a1\u3001\u539f\u7406\uff1a\u6760\u6746\u539f\u7406\u3002
2\u3001\u6ce8\u610f\u4e8b\u9879\uff1a\u88ab\u6d4b\u7269\u4f53\u4e0d\u8981\u8d85\u8fc7\u5929\u5e73\u7684\u79f0\u91cf\uff1b\u5411\u76d8\u4e2d\u52a0\u51cf\u781d\u7801\u8981\u7528\u954a\u5b50\uff0c\u4e0d\u80fd\u628a\u781d\u7801\u5f04\u810f\u3001\u5f04\u6e7f\uff1b\u6f6e\u6e7f\u7684\u7269\u4f53\u548c\u5316\u5b66\u836f\u54c1\u4e0d\u80fd\u76f4\u63a5\u653e\u5230\u5929\u5e73\u7684\u76d8\u4e2d
3\u3001\u4f7f\u7528\uff1a\uff081\uff09\u628a\u5929\u5e73\u653e\u5728\u6c34\u5e73\u53f0\u4e0a\uff1b\uff082\uff09\u628a\u6e38\u7801\u653e\u5230\u6807\u5c3a\u653e\u5230\u5de6\u7aef\u7684\u96f6\u523b\u7ebf\u5904\uff0c\u8c03\u8282\u6a2a\u6881\u4e0a\u7684\u5e73\u8861\u87ba\u6bcd\uff0c\u4f7f\u5929\u5e73\u5e73\u8861\uff08\u6307\u9488\u6307\u5411\u5206\u5ea6\u76d8\u7684\u4e2d\u7ebf\u6216\u5de6\u53f3\u6446\u52a8\u5e45\u5ea6\u76f8\u7b49\uff09\u3002\uff083\uff09\u628a\u7269\u4f53\u653e\u5230\u5de6\u76d8\uff0c\u53f3\u76d8\u653e\u781d\u7801\uff0c\u589e\u51cf\u781d\u7801\u5e76\u8c03\u8282\u6e38\u7801\uff0c\u4f7f\u5929\u5e73\u5e73\u8861\u3002(4\uff09\u8bfb\u6570\uff1a\u781d\u7801\u7684\u603b\u8d28\u91cf\u52a0\u4e0a\u6e38\u7801\u5bf9\u5e94\u7684\u523b\u5ea6\u503c\u3002
\u6ce8\uff1a\u5931\u91cd\u65f6\uff08\u5982\uff1a\u5b87\u822a\u8239\uff09\u4e0d\u80fd\u7528\u5929\u5e73\u79f0\u91cf\u8d28\u91cf\u3002
\u4e09\u3001\u5bc6\u5ea6
\u5bc6\u5ea6\u662f\u7269\u8d28\u7684\u4e00\u79cd\u7279\u6b8a\u5c5e\u6027\uff1b\u540c\u79cd\u7269\u8d28\u7684\u8d28\u91cf\u8ddf\u4f53\u79ef\u6210\u6b63\u6bd4\uff0c\u8d28\u91cf\u8ddf\u4f53\u79ef\u7684\u6bd4\u503c\u662f\u5b9a\u503c\u3002
\u5bc6\u5ea6\uff1a\u5355\u4f4d\u4f53\u79ef\u67d0\u79cd\u7269\u8d28\u7684\u8d28\u91cf\u53eb\u505a\u8fd9\u79cd\u7269\u8d28\u7684\u5bc6\u5ea6\u3002
\u5bc6\u5ea6\u5927\u5c0f\u4e0e\u7269\u8d28\u7684\u79cd\u7c7b\u3001\u72b6\u6001\u6709\u5173\uff0c\u53d7\u5230\u6e29\u5ea6\u7684\u5f71\u54cd\uff0c\u4e0e\u8d28\u91cf\u3001\u4f53\u79ef\u65e0\u5173\u3002
\u516c\u5f0f\uff1a
\u5355\u4f4d\uff1akg/m3 g/cm3 1\u00d7103kg/m3=1g/cm3\u3002
1L=1dm3=10-3m3\uff1b1ml=1cm3=10-3L=10-6m3\u3002
\u56db\u3001\u6d4b\u91cf\u7269\u8d28\u7684\u5bc6\u5ea6
\u5b9e\u9a8c\u539f\u7406\uff1a
\u5b9e\u9a8c\u5668\u6750\uff1a\u5929\u5e73\u3001\u91cf\u7b52\u3001\u70e7\u676f\u3001\u7ec6\u7ebf
\u91cf\u7b52\uff1a\u6d4b\u91cf\u6db2\u4f53\u4f53\u79ef\uff08\u53ef\u95f4\u63a5\u6d4b\u91cf\u56fa\u4f53\u4f53\u79ef\uff09\uff0c\u8bfb\u6570\u662f\u4ee5\u51f9\u6db2\u9762\u7684\u6700\u4f4e\u5904\u4e3a\u51c6\u3002
\u6d4b\u56fa\u4f53\uff08\u5bc6\u5ea6\u6bd4\u6c34\u5927\uff09\u7684\u5bc6\u5ea6\uff1a\u6b65\u9aa4\uff1a
1\u3001\u7528\u5929\u5e73\u79f0\u51fa\u56fa\u4f53\u7684\u8d28\u91cfm\uff1b2\u3001\u5728\u91cf\u7b52\u91cc\u5012\u5165\u9002\u91cf\uff08\u80fd\u6d78\u6ca1\u7269\u4f53\uff0c\u53c8\u4e0d\u8d85\u8fc7\u6700\u5927\u523b\u5ea6\uff09\u7684\u6c34\uff0c\u8bfb\u51fa\u6c34\u7684\u4f53\u79efV1\uff1b3\u3001\u7528\u7ec6\u7ebf\u62f4\u597d\u7269\u4f53\uff0c\u653e\u5165\u91cf\u7b52\u4e2d\uff0c\u8bfb\u51fa\u603b\u4f53\u79efV2\u3002
\u6ce8\uff1a\u82e5\u56fa\u4f53\u7684\u5bc6\u5ea6\u6bd4\u6c34\u5c0f\uff0c\u53ef\u91c7\u7528\u9488\u538b\u6cd5\u548c\u91cd\u7269\u4e0b\u5760\u6cd5\u3002
\u6d4b\u91cf\u6db2\u4f53\u7684\u5bc6\u5ea6\uff1a\u6b65\u9aa4\uff1a1\u3001\u7528\u5929\u5e73\u79f0\u51fa\u70e7\u676f\u548c\u6db2\u4f53\u7684\u603b\u8d28\u91cfm1\uff1b2\u3001\u628a\u70e7\u676f\u91cc\u7684\u6db2\u4f53\u5012\u5165\u91cf\u7b52\u4e2d\u4e00\u90e8\u5206\uff0c\u8bfb\u51fa\u6db2\u4f53\u7684\u4f53\u79efV2\uff1b3\u3001\u7528\u5929\u5e73\u79f0\u51fa\u5269\u4f59\u7684\u6db2\u4f53\u548c\u70e7\u676f\u7684\u8d28\u91cfm2\u3002
\u4e94\u3001\u5bc6\u5ea6\u4e0e\u793e\u4f1a\u751f\u6d3b
\u5bc6\u5ea6\u662f\u7269\u8d28\u7684\u57fa\u672c\u5c5e\u6027\uff08\u7279\u6027\uff09\uff0c\u6bcf\u79cd\u7269\u8d28\u90fd\u6709\u81ea\u5df1\u7684\u5bc6\u5ea6\u3002
\u5bc6\u5ea6\u4e0e\u6e29\u5ea6\uff1a\u6e29\u5ea6\u80fd\u591f\u6539\u53d8\u7269\u8d28\u7684\u5bc6\u5ea6\uff1b\u6c14\u4f53\u70ed\u81a8\u80c0\u6700\u663e\u8457\uff0c\u5b83\u7684\u5bc6\u5ea6\u53d7\u6e29\u5ea6\u5f71\u54cd\u6700\u5927\uff1b\u56fa\u4f53\u548c\u6db2\u4f53\u53d7\u6e29\u5ea6\u5f71\u54cd\u6bd4\u8f83\u5c0f\u3002
\u6c34\u7684\u53cd\u5e38\u81a8\u80c0\uff1a4\u2103\u5bc6\u5ea6\u6700\u5927\uff1b\u6c34\u7ed3\u51b0\u4f53\u79ef\u53d8\u5927\u3002
\u5bc6\u5ea6\u5e94\u7528\uff1a1\u3001\u9274\u522b\u7269\u8d28\uff08\u6d4b\u5bc6\u5ea6\uff092\u3001\u6c42\u8d28\u91cf3\u3001\u6c42\u4f53\u79ef\u3002
\u7b2c\u5341\u4e8c\u7ae0 \u8fd0\u52a8\u548c\u529b
\u4e00\u3001\u8fd0\u52a8\u7684\u63cf\u8ff0
\u8fd0\u52a8\u662f\u5b87\u5b99\u4e2d\u666e\u904d\u7684\u73b0\u8c61\u3002
\u673a\u68b0\u8fd0\u52a8\uff1a\u7269\u4f53\u4f4d\u7f6e\u7684\u53d8\u5316\u53eb\u673a\u68b0\u8fd0\u52a8\u3002
\u53c2\u7167\u7269\uff1a\u5728\u7814\u7a76\u7269\u4f53\u8fd0\u52a8\u8fd8\u662f\u9759\u6b62\u65f6\u88ab\u9009\u4f5c\u6807\u51c6\u7684\u7269\u4f53(\u6216\u8005\u8bf4\u88ab\u5047\u5b9a\u4e0d\u52a8\u7684\u7269\u4f53)\u53eb\u53c2\u7167\u7269.
\u8fd0\u52a8\u548c\u9759\u6b62\u7684\u76f8\u5bf9\u6027\uff1a\u540c\u4e00\u4e2a\u7269\u4f53\u662f\u8fd0\u52a8\u8fd8\u662f\u9759\u6b62\uff0c\u53d6\u51b3\u4e8e\u6240\u9009\u7684\u53c2\u7167\u7269\u3002
\u4e8c\u3001\u8fd0\u52a8\u7684\u5feb\u6162
\u901f\u5ea6\uff1a\u63cf\u8ff0\u7269\u4f53\u8fd0\u52a8\u7684\u5feb\u6162\uff0c\u901f\u5ea6\u7b49\u4e8e\u8fd0\u52a8\u7269\u4f53\u5728\u5355\u4f4d\u65f6\u95f4\u901a\u8fc7\u7684\u8def\u7a0b\u3002
\u516c\u5f0f\uff1a
\u901f\u5ea6\u7684\u5355\u4f4d\u662f\uff1am/s\uff1bkm/h\u3002
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(1)F\u6d6e G \u4e0a\u6d6e\uff08\u6700\u540e\u6f02\u6d6e\uff0c\u6b64\u65f6F\u6d6e=G\uff09
(3)F\u6d6e = G \u60ac\u6d6e\u6216\u6f02\u6d6e
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(1) > \u4e0b\u6c89\uff1b(2) < \u4e0a\u6d6e\uff1b (3) = \u60ac\u6d6e\u3002\uff08\u4e0d\u4f1a\u6f02\u6d6e\uff09
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(1)\u79f0\u91cf\u6cd5\uff1aF\u6d6e=G-F \uff0c(G\u662f\u7269\u4f53\u53d7\u5230\u91cd\u529b\uff0cF \u662f\u7269\u4f53\u6d78\u5165\u6db2\u4f53\u4e2d\u5f39\u7c27\u79e4\u7684\u8bfb\u6570)
(2)\u538b\u529b\u5dee\u6cd5\uff1aF\u6d6e=F\u5411\u4e0a-F\u5411\u4e0b
(3)\u963f\u57fa\u7c73\u5fb7\u539f\u7406\uff1a
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声学考点说明：声学在中考物理试卷中约占1～3分，常见的题型为选择和填空。本专题的主要知识点有：1.知道空气的声速为340m/s(T=15)，知道真空不能传声。2.知道乐音的三个特征，能够区分音调、响度和音色。3.知道噪声的危害及减弱噪声的方法，增强环境保护意识。4.知道什么是超声波，了解超声波在现代技术中的应用。

光学考点说明：光的直线传播与反射是中考必考内容，但不是考查重点内容。本专题重点有：
1.了解光源，理解光在均匀介质中沿直线传播。 2.知道光在真空中的传播速度是3x m/s。
3.了解色散现象，知道色光的三基色与原料的三原始是不同的。
4.理解光的反射定律，知道镜面反射和漫反射。 5.知道平面镜成像的特点及其应用。

光的折射考点说明：光学部分在中考中的比例约为10%，考题难度不大，光的折射、凸透镜的成像规律及应用是中考的重点，研究平面镜的成像及凸透镜的成像试验方法和技能是现在中考考察的热点，知识点主要有：光的折射的概念。光的折射定律。

中考对长度与时间的测量考查较少，大多以选择题填空题的形式出现。机械运动和运动快慢的描述以及力与运动的关系是本专题的主要内容。参照物的选择、比较运动的快慢以及牛顿第一定律是中考的点。

质量是中考必考的知识点，约占总分的2%到3%左右，大多数情况下，题目以选择题或填空题的形式出现，也有一些题目出现在试验题中。本专题考查的知识点主要有：1.质量的概念、单位及其换算。2.对物体质量多少的估测。3.天平的使用及读数。4.质量测量的特殊方法。

根据新课标对本部分的要求,纵观近几年全国各地中考的命题趋势,预测2009年的中考,这部分内容将围绕以下方面进行考查:1.通过实验数据的分析论证,建立密度概念的过程和方法,以及对密度概念和公式的理解。2.用量筒测体积,会用天平和量筒测固体、液体的密度。3.密度的应用是中考考查的重点内容,往往与力学中的压强和浮力结合。

力；1.利用力的知识分析实际问题，画力的示意图。2.考查弹簧测力计的原理、读数和使用方法，考查观察和实际，应用物理知识解决简单问题的能力。3.考查重力的概念、重力的三要素、能熟练应用G=mg解题。4.运用摩擦力的知识解释有关现象

1、《多彩的物质世界》——质量、密度、体积三者之间的关系。⑴ 原理：ρ=m/V
2、《运动和力》一、机械运动定义：物理学里把物体位置变化叫做机械运动。
特点：机械运动是宇宙中最普遍的现象。 匀速直线运动：分类：（根据运动路线）⑴曲线运动 ⑵直线运动 变速运动；二、力的作用与测量；三、惯性和惯性定律（牛顿第一定理）；四、二力平衡。
3、《力和机械》——弹力、重力、摩擦力、杠杆原理、滑轮。
4、《压力和压强》
5、《功和机械能》
6、《热和能》——能量守恒定律

我的百度文库里面有：力、热、声、光、电等几章的记忆总结，欢迎来看看................

力学 电学占的分值大

主要是力学、电学、机械运动。还有相关实验部分

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