求物理公式
\u6c42\u7269\u7406\u516c\u5f0f\u9ad8\u4e2d\u7684\u8fd8\u662f\u521d\u4e2d\u7684\uff1f
\u521d\u4e2d\uff1a
\u9ad8\u4e2d\u7684\uff1a
1. V=X/t
V\u662f\u5e73\u5747\u901f\u5ea6\uff08m/s\uff09 X\u662f\u4f4d\u79fb\uff08m\uff09 t\u662f\u65f6\u95f4\uff08s\uff09\uff1b
2. Vt=Vo+a0t
Vt\u662f\u672b\u901f\u5ea6\uff08m/s\uff09 Vo\u662f\u521d\u901f\u5ea6\uff08m/s\uff09 a\u662f\u52a0\u901f\u5ea6\uff08m/s²\uff09t\u662f\u65f6\u95f4\uff08s\uff09\uff1b
3. X=Vot+\uff081/2\uff09at²
X\u662f\u4f4d\u79fb\uff08m\uff09 Vo\u662f\u521d\u901f\u5ea6\uff08m/s\uff09 t\u662f\u65f6\u95f4\uff08s\uff09 a\u662f\u52a0\u901f\u5ea6\uff08m/s²\uff09\uff1b
4. Vt²-Vo²=2aX
Vt\u662f\u672b\u901f\u5ea6\uff08m/s\uff09 Vo\u662f\u521d\u901f\u5ea6\uff08m/s\uff09 a\u662f\u52a0\u901f\u5ea6\uff08m/s²\uff09X\u662f\u4f4d\u79fb\uff08m\uff09\uff1b
5. h=\uff081/2\uff09gt² Vt=gt Vt²=2gh
h\u662f\u9ad8\u5ea6\uff08m\uff09 g\u662f\u91cd\u529b\u52a0\u901f\u5ea6\uff089.8m/s²\u224810m/s²\uff09
t\u662f\u65f6\u95f4\uff08s\uff09 Vt\u662f\u672b\u901f\u5ea6\uff08m/s\uff09\uff1b
6. G=mg
G\u662f\u91cd\u529b\uff08N\uff09 m\u662f\u8d28\u91cf\uff08kg\uff09g\u662f\u91cd\u529b\u52a0\u901f\u5ea6\uff089.8m/s²\u224810m/s²\uff09\uff1b
7.f=\u03bcFN
f\u662f\u6469\u64e6\u529b\uff08N\uff09\u03bc\u662f\u52a8\u6469\u64e6\u56e0\u6570 FN\u662f\u652f\u6301\u529b\uff08N\uff09\uff1b
8.F=kX
F\u662f\u5f39\u529b\uff08N\uff09 k\u662f\u52b2\u5ea6\u7cfb\u6570\uff08N/m\uff09 X\u662f\u4f38\u957f\u91cf\uff08m\uff09\uff1b
9.F=ma
F\u662f\u5408\u529b\uff08N\uff09 m\u662f\u8d28\u91cf\uff08kg\uff09 a\u662f\u52a0\u901f\u5ea6\uff08m/s²\uff09\u3002
1. a\u5411=V²/r=\u03c9²r=\uff082\u03c0/T\uff09²r=\uff082\u03c0f\uff09²r=\u03c9V\uff08\u03c9=\u03c6/t\uff09
a\u5411\u662f\u5411\u5fc3\u52a0\u901f\u5ea6\uff08m/s²\uff09 V\u662f\u7ebf\u901f\u5ea6\uff08m/s\uff09 r\u662f\u534a\u5f84\uff08m\uff09
\u03c9\u662f\u89d2\u901f\u5ea6\uff08rad/s\uff09 \u03c6\u662f\u5f27\u5ea6\uff08rad\uff09 t\u662f\u65f6\u95f4\uff08s\uff09
T\u662f\u5468\u671f\uff08s\uff09 f\u662f\u9891\u7387\uff08Hz\uff09\uff1b
2. F\u5408=F\u5411=ma\u5411=m\uff08V²/r\uff09=m\u03c9²r=m\uff082\u03c0/T\uff09²r
=m\uff082\u03c0f\uff09²r
F\u5408\u662f\u5706\u5468\u8fd0\u52a8\u7684\u5408\u529b\uff08N\uff09 F\u5411\u662f\u5411\u5fc3\u529b\uff08N\uff09
m\u662f\u8d28\u91cf\uff08kg\uff09a\u5411\u662f\u5411\u5fc3\u52a0\u901f\u5ea6\uff08m/s²\uff09 V\u662f\u7ebf\u901f\u5ea6\uff08m/s\uff09
r\u662f\u534a\u5f84\uff08m\uff09\u03c9\u662f\u89d2\u901f\u5ea6\uff08rad/s\uff09T\u662f\u5468\u671f\uff08s\uff09
f\u662f\u9891\u7387\uff08Hz\uff09\uff1b
3. F\u5f15=F\u5411=m\uff082\u03c0/T\uff09²r=G\uff08Mm/r²\uff09
F\u5f15\u662f\u5f15\u529b\uff08N\uff09 F\u5411\u662f\u5411\u5fc3\u529b\uff08N\uff09 m\u662f\u8d28\u91cf\uff08kg\uff09
T\u662f\u5468\u671f\uff08s\uff09r\u662f\u534a\u5f84\uff08m\uff09
G\u662f\u5f15\u529b\u5e38\u91cf\uff086.67\u00d710-11N/\uff08kg\u00b7m²\uff09 M\u662f\u8d28\u91cf\uff08kg\uff09\uff1b
4. \u63a8\u5bfc\u516c\u5f0f\uff1a\u2235F\u5f15=F\u5411 \u2234g=G\uff08M\u2019/r\u2019²\uff09
\u2234G\uff08Mm/r²\uff09= m\uff08V²/r\uff09
=m\u03c9²r
=m\uff082\u03c0/T\uff09²r
=m\uff082\u03c0f\uff09²r
=ma\u5411 =>a\u5411=GM/r²
F\u5f15\u662f\u5f15\u529b\uff08N\uff09 F\u5411\u662f\u5411\u5fc3\u529b\uff08N\uff09
G\u662f\u5f15\u529b\u5e38\u91cf\uff086.67\u00d710-11N/\uff08kg\u00b7m²\uff09 M\u662f\u8d28\u91cf\uff08kg\uff09
m\u662f\u8d28\u91cf\uff08kg\uff09r\u662f\u534a\u5f84\uff08m\uff09 V\u662f\u7ebf\u901f\u5ea6\uff08m/s\uff09
\u03c9\u662f\u89d2\u901f\u5ea6\uff08rad/s\uff09 T\u662f\u5468\u671f\uff08s\uff09 f\u662f\u9891\u7387\uff08Hz\uff09
g\u662f\u91cd\u529b\u52a0\u901f\u5ea6\uff089.8m/s²\u224810m/s²\uff09
a\u5411\u662f\u5411\u5fc3\u52a0\u901f\u5ea6\uff08m/s²\uff09 M\u2019\u662f\u8be5\u5929\u4f53\u7684\u8d28\u91cf\uff08kg\uff09
r\u2019\u662f\u8be5\u5929\u4f53\u7684\u534a\u5f84\uff08m\uff09\uff1b
5.
\u03c1\u662f\u5929\u4f53\u5bc6\u5ea6\uff08kg/m³\uff09 R\u662f\u5929\u4f53\u534a\u5f84\uff08m\uff09
G\u662f\u5f15\u529b\u5e38\u91cf\uff086.67\u00d710-11N/\uff08kg\u00b7m²\uff09T\u662f\u5468\u671f\uff08s\uff09\uff1b6.W=FScos\u03b8
W\u662f\u529f\uff08J\uff09 F\u662f\u529b\uff08N\uff09 S\u662f\u6cbf\u529b\u7684\u65b9\u5411\u79fb\u52a8\u7684\u4f4d\u79fb\uff08m\uff09
cos\u03b8\u662f\u529b\u7684\u65b9\u5411\u4e0e\u6c34\u5e73\u65b9\u5411\u7684\u5939\u89d2\u4f59\u5f26\uff1b
7.P=W/t=FV
P\u662f\u529f\u7387\uff08W\uff09 W\u662f\u529f\uff08J\uff09 t\u662f\u65f6\u95f4\uff08s\uff09 F\u662f\u529b\uff08N\uff09
V\u662f\u901f\u5ea6\uff08m/s\uff09\uff1b
8.W=\u0394Ep=mg\u0394h=mg\uff08h1-h2\uff09
W\u662f\u91cd\u529b\u52bf\u80fd\u505a\u7684\u529f\uff08J\uff09\u0394Ep\u662f\u91cd\u529b\u52bf\u80fd\uff08J\uff09
m\u662f\u7269\u4f53\u7684\u8d28\u91cf\uff08kg\uff09 g\u662f\u91cd\u529b\u52a0\u901f\u5ea6\uff089.8m/s²\u224810m/s²\uff09\u0394h\u662f\u9ad8\u5ea6\u5dee\uff08m\uff09 h1\u662f\u8d77\u59cb\u9ad8\u5ea6\uff08m\uff09
h2\u662f\u7ec8\u6b62\uff08\u672b\uff09\u9ad8\u5ea6\uff08m\uff09\uff1b
9.\u0394Ep=\uff081/2\uff09kX²
\u0394Ep\u662f\u5f39\u6027\u662f\u80fd\uff08J\uff09 k\u662f\u52b2\u5ea6\u7cfb\u6570\uff08N/m\uff09 X\u662f\u4f38\u957f\u91cf\uff08m\uff09\uff1b
10. Ek =\uff081/2\uff09mV²
Ek\u662f\u52a8\u80fd\uff08J\uff09m\u662f\u8d28\u91cf\uff08kg\uff09V\u662f\u901f\u5ea6\uff08m/s\uff09\uff1b
11.\u52a8\u80fd\u5b9a\u7406\uff1aW\u603b=\uff081/2\uff09mVt²-\uff081/2\uff09mVo²
\u673a\u68b0\u80fd\u5b88\u6052\uff1aE=Ep+ Ek +Ep\u2019
W\u662f\u603b\u80fd\u91cf\uff08J\uff09m\u662f\u8d28\u91cf\uff08kg\uff09Vt\u662f\u672b\u901f\u5ea6\uff08m/s\uff09
Vo\u662f\u521d\u901f\u5ea6\uff08m/s\uff09 E\u662f\u673a\u68b0\u80fd\uff08J\uff09 Ep\u662f\u91cd\u529b\u52bf\u80fd\uff08J\uff09
Ek\u662f\u52a8\u80fd\uff08J\uff09 Ep\u2019\u662f\u5f39\u6027\u52bf\u80fd\uff08J\uff09\u3002
F\u662f\u7535\u573a\u529b\uff08N\uff09 k\u662f\u9759\u7535\u529b\u5e38\u91cf\uff08=9.0\u00d7109N•m²/C²\uff09
q1\u3001q2\u662f\u7535\u8377\u5e26\u7535\u91cf\uff08C\uff09 r\u662f\u4e24\u4e2a\u7535\u8377\u7684\u8ddd\u79bb\uff08m\uff09\uff1b
2.E=
E\u662f\u7535\u573a\u5f3a\u5ea6\uff08N/C\u6216V/m²\u5747\u53ef\uff0c1N/C=1V/m²\uff09
F\u662f\u7535\u573a\u529b\uff08N\uff09 q\u662f\u7535\u8377\u91cf\uff08C\uff09
*\u70b9\u7535\u8377\uff1a
EQ\u662f\u70b9\u7535\u8377\u7535\u573a\u5f3a\u5ea6\uff08N/C\u6216V/m²\u5747\u53ef\uff0c1N/C=1V/m²\uff09
k\u662f\u9759\u7535\u529b\u5e38\u91cf\uff08=9.0\u00d7109N•m²/C²\uff09
Q\u662f\u70b9\u7535\u8377\u5e26\u7535\u91cf\uff08C\uff09 r\u662f\u534a\u5f84\uff08m\uff09\uff1b
3. \u03c6=
\u03c6\u662f\u7535\u52bf\uff08V\uff09 E\u662f\u7535\u52bf\u80fd\uff08J\uff09 q\u662f\u7535\u8377\u91cf\uff08C\uff09\uff1b
4.
=
UAB\u662fA\u3001B\u4e24\u70b9\u7684\u7535\u52bf\u5dee\uff08V\uff09 q\u662f\u7535\u8377\u91cf\uff08C\uff09
WAB\u662f\u4eceA\u70b9\u5230B\u70b9\u505a\u7684\u529f\uff08J\uff09
EpA \u662fA\u70b9\u7684\u7535\u52bf\u80fd\uff08J\uff09 EpB\u662fB\u70b9\u7684\u7535\u52bf\u80fd\uff08J\uff09
\u03c6A\u662fA\u70b9\u7535\u52bf\uff08V\uff09 \u03c6B\u662fB\u70b9\u7535\u52bf\uff08V\uff09\uff1b
5.UAB=Ed
UAB\u662fA\u3001B\u4e24\u70b9\u7684\u7535\u52bf\u5dee\uff08V\uff09 d\u662f\u8ddd\u79bb\uff08m\uff09
E\u662f\u7535\u573a\u5f3a\u5ea6\uff08N/C\u6216V/m²\u5747\u53ef\uff0c1N/C=1V/m²\uff09
6.C=
C\u662f\u7535\u5bb9\uff08F\uff09 Q\u662f\u7535\u8377\u91cf\uff08C\uff09 U\u662f\u7535\u52bf\u5dee\uff08V\uff09\uff1b
7.\u63a8\u5bfc\u516c\u5f0f\uff1a
E== =
E\u662f\u7535\u573a\u5f3a\u5ea6\uff08N/C\u6216V/m²\u5747\u53ef\uff0c1N/C=1V/m²\uff09
U\u662f\u7535\u52bf\u5dee\uff08V\uff09d\u662f\u8ddd\u79bb\uff08m\uff09Q\u662f\u5e26\u7535\u91cf\uff08C\uff09
k\u662f\u9759\u7535\u529b\u5e38\u91cf\uff08=9.0\u00d7109N •m²/C²\uff09
\u03b5\u662f\u76f8\u5bf9\u4ecb\u7535\u5e38\u6570\uff1b
8.q=It
q\u662f\u7535\u8377\u91cf\uff08C\uff09 I\u662f\u7535\u6d41\uff08A\uff09 t\u662f\u65f6\u95f4\uff08s\uff09\uff1b
9.I=\uff08\u6b27\u59c6\u5b9a\u5f8b\uff09 I=\uff08\u95ed\u5408\u7535\u8def\u6b27\u59c6\u5b9a\u5f8b\uff09
I\u662f\u7535\u6d41\uff08A\uff09 U\u662f\u7535\u52bf\u5dee\uff08\u7535\u538b\uff09\uff08V\uff09 R\u662f\u7535\u963b\uff08\u03a9\uff09
E\u662f\u7535\u52a8\u52bf\uff08V\uff09 r\u662f\u5185\u7535\u963b\uff08\u03a9\uff09
\u63a8\u5bfc\u516c\u5f0f\uff1aE=U\u5916+U\u5185=IR+Ir
U\u5916\u662f\u5916\u7535\u8def\u7535\u52bf\u5dee\uff08\u7535\u538b\uff09\uff08V\uff09
U\u5185\u662f\u5185\u7535\u8def\u7535\u52bf\u5dee\uff08\u7535\u538b\uff09\uff08V\uff09
\u4e32\u8054\u7535\u8def\u603b\u7535\u963b\uff1aR=R1+R2+
\u5e76\u8054\u7535\u8def\u603b\u7535\u963b\uff1a =+=>R=
*\u4e32\u8054\u5206\u538b\u4e0e\u7535\u963b\u6210\u6b63\u6bd4\uff0c\u5e76\u8054\u7535\u6d41\u4e0e\u7535\u963b\u6210\u53cd\u6bd4\uff1a\u201c\u4e32\u6b63\u5e76\u53cd\u201d\uff01
10.P=UI W=UIt=Pt
P\u662f\u7535\u529f\u7387\uff08W\uff09 U\u662f\u7535\u52bf\u5dee\uff08\u7535\u538b\uff09\uff08V\uff09 I\u662f\u7535\u6d41\uff08A\uff09
W\u662f\u7535\u529f\uff08J\uff09 t\u662f\u65f6\u95f4\uff08s\uff09
\u63a8\u5bfc\u516c\u5f0f\uff1a\u2235I=\uff0cP=UI \u2234R=\uff0cP=I²R
U\u989d\u662f\u989d\u5b9a\u7535\u538b\uff08V\uff09 U\u5b9e\u662f\u5b9e\u9645\u7535\u538b\uff08V\uff09
P\u989d\u662f\u989d\u5b9a\u529f\u7387\uff08W\uff09 P\u5b9e\u662f\u5b9e\u9645\u529f\u7387\uff08W\uff09
R\u662f\u7eaf\u7535\u963b\u7535\u8def\u7684\u7535\u963b\uff08\u03a9\uff09
Q=I²Rt\uff0cR=\u03c1
Q\u662f\u7535\u6d41\u4ea7\u751f\u7684\u70ed\u91cf\uff08\u7126\u8033\u70ed\uff09\uff08J\uff09 L\u662f\u5bfc\u4f53\u957f\u5ea6\uff08m\uff09
\u03c1\u662f\u7535\u963b\u7387\uff0c\u7531\u6750\u6599\u672c\u8eab\u51b3\u5b9a\uff08\u03a9•m\uff09
S\u662f\u5bfc\u4f53\u6a2a\u622a\u9762\u79ef\uff08m²\uff09\uff1b
*\u6b27\u59c6\u5b9a\u5f8b\u4e2d\u7684\u6240\u6709\u516c\u5f0f\u8981\u6c42\u662f\u5728\u7eaf\u7535\u963b\u7535\u8def\u4e2d\u4f7f\u7528\u3002\u6ce8\u610f\u7535\u52a8\u52bf\uff08\u7535\u6e90\uff09\u7684\u5185\u963br\u4e0d\u53ef\u5ffd\u7565\uff01
11.F=BIL
F\u662f\u5b89\u57f9\u529b\uff08N\uff09 B\u662f\u78c1\u611f\u5e94\u5f3a\u5ea6\uff08T\uff09 S\u662f\u9762\u79ef\uff08m²\uff09\uff1b
12.\u03a6=BS
\u03a6\u662f\u78c1\u901a\u91cf\uff08Wb\uff09 B\u662f\u78c1\u611f\u5e94\u5f3a\u5ea6\uff08T\uff09 S\u662f\u9762\u79ef\uff08m²\uff09
13.f=qVB
f\u662f\u6d1b\u4f26\u5179\u529b\uff08N\uff09 q\u662f\u7535\u8377\u91cf\uff08C\uff09 V\u662f\u901f\u5ea6\uff08m/s\uff09
B\u662f\u78c1\u611f\u5e94\u5f3a\u5ea6\uff08T\uff09\uff1b
\u63a8\u5bfc\u516c\u5f0f\uff1a\u2235f=F\u5411\u2234qVB=m \u2234R=T==
f\u662f\u6d1b\u4f26\u5179\u529b\uff08N\uff09 F\u5411\u662f\u5411\u5fc3\u529b\uff08N\uff09 q\u662f\u7535\u8377\u91cf\uff08C\uff09
V\u662f\u901f\u5ea6\uff08m/s\uff09 B\u662f\u78c1\u611f\u5e94\u5f3a\u5ea6\uff08T\uff09 m\u662f\u8d28\u91cf\uff08kg\uff09
r\u662f\u534a\u5f84\uff08m\uff09 T\u662f\u5468\u671f\uff08s\uff09\u3002
\u03a6=BSsin\u03b8
\u03a6\u662f\u78c1\u901a\u91cf\uff08Wb\uff09 B\u662f\u78c1\u611f\u5e94\u5f3a\u5ea6\uff08T\uff09 S\u662f\u9762\u79ef\uff08m²\uff09
sin\u03b8\u662f\u78c1\u573a\u65b9\u5411\u4e0e\u5bfc\u4f53\u9762\u7684\u5939\u89d2\u6b63\u5f26\u503c\uff1b
2.E=n
E\u662f\u611f\u5e94\u7535\u52a8\u52bf\uff08V\uff09 n\u662f\u531d\u6570\uff08\u531d\uff09
\u03a6\u662f\u78c1\u901a\u91cf\u7684\u53d8\u5316\u91cf\uff08Wb\uff09\u0394t\u662f\u78c1\u901a\u91cf\u7684\u53d8\u5316\u65f6\u95f4\uff08s\uff09\uff1b
\u63a8\u5bfc\u516c\u5f0f\uff1aE=n=nS=nB=BLVsin\u03b8
B\u662f\u78c1\u611f\u5e94\u5f3a\u5ea6\uff08T\uff09 S\u662f\u9762\u79ef\uff08m²\uff09
\u0394S\u662f\u53d8\u5316\u9762\u79ef\uff08m²\uff09\u0394B\u662f\u53d8\u5316\u78c1\u611f\u5e94\u5f3a\u5ea6\uff08T\uff09
L\u662f\u6709\u6548\u957f\u5ea6\uff08m\uff09 V\u662f\u901f\u5ea6\uff08m/s\uff09
sin\u03b8\u662f\u78c1\u573a\u65b9\u5411\u4e0e\u8fd0\u52a8\u65b9\u5411\u7684\u5939\u89d2\u6b63\u5f26\u503c\uff1b
\u63a8\u5bfc\u516c\u5f0f\uff1aF\u5b89= q=n P\u5b89=P\u7535=
F\u5b89\u662f\u5b89\u57f9\u529b\uff08N\uff09 Vm\u662f\u6700\u5927\u901f\u5ea6\uff08m/s\uff09
R\u662f\u5916\u603b\u7535\u963b\uff08\u03a9\uff09 r\u662f\u5185\u603b\u7535\u963b\uff08\u03a9\uff09
r\u2019\u662f\u5bfc\u4f53\u672c\u8eab\u7535\u963b\uff08\u03a9\uff09 P\u5b89\u662f\u5b89\u57f9\u529b\u7684\u529f\u7387\uff08W\uff09
P\u7535\u662f\u7535\u529f\u7387\uff08W\uff09 V\u662f\u901f\u5ea6\uff08m/s\uff09\uff1b
3.E\u81ea=L
E\u81ea\u662f\u81ea\u611f\u7535\u52a8\u52bf\uff08V\uff09 L\u662f\u81ea\u611f\u7cfb\u6570\uff08H\uff09
\u0394I\u662f\u53d8\u5316\u81ea\u611f\u7535\u6d41\uff08A\uff09\u0394t\u662f\u53d8\u5316\u65f6\u95f4\uff08s\uff09\uff1b
4.e=Emsin\u03c9t
e\u662f\u7535\u52a8\u52bf\uff08\u7535\u538b\uff09\uff08V\uff09 Em\u662f\u7535\u52a8\u52bf\uff08\u7535\u538b\uff09\u7684\u5cf0\u503c\uff08V\uff09
\u03c9\u662f\u7ebf\u5708\u8f6c\u52a8\u7684\u89d2\u901f\u5ea6\uff08rad/s\uff09 t\u662f\u65f6\u95f4\uff08s\uff09\uff1b
5.Em=nBS\u03c9
Em\u662f\u7535\u52a8\u52bf\uff08\u7535\u538b\uff09\u7684\u5cf0\u503c\uff08V\uff09 n\u662f\u531d\u6570\uff08\u531d\uff09
B\u662f\u78c1\u611f\u5e94\u5f3a\u5ea6\uff08T\uff09 S\u662f\u9762\u79ef\uff08m²\uff09
\u03c9\u662f\u7ebf\u5708\u8f6c\u52a8\u7684\u89d2\u901f\u5ea6\uff08rad/s\uff09\uff1b
6.T=
T\u662f\u5468\u671f\uff08s\uff09 f\u662f\u9891\u7387\uff08Hz\uff09\uff1b
7.I==0.707Im Um==0.707Um
I\u662f\u7535\u6d41\u7684\u6709\u6548\u503c\uff08A\uff09 Im\u662f\u7535\u6d41\u7684\u5cf0\u503c\uff08A\uff09
U\u662f\u7535\u538b\u7684\u6709\u6548\u503c\uff08V\uff09 Um\u662f\u7535\u538b\u7684\u5cf0\u503c\uff08V\uff09\uff1b
8.
U1\u662f\u539f\u7ebf\u5708\u4e24\u7aef\u7535\u538b\uff08V\uff09 U2\u662f\u526f\u7ebf\u5708\u4e24\u7aef\u7535\u538b\uff08V\uff09
n1\u662f\u539f\u7ebf\u5708\u7684\u531d\u6570\uff08\u531d\uff09 n2\u662f\u526f\u7ebf\u5708\u7684\u531d\u6570\uff08\u531d\uff09\uff1b
\u63a8\u5bfc\u516c\u5f0f\uff1an1I1=n2I2
I1\u662f\u539f\u7ebf\u5708\u4e2d\u7684\u7535\u6d41\uff08A\uff09 I2\u662f\u526f\u7ebf\u5708\u4e2d\u7684\u7535\u6d41\uff08A\uff09
n1\u662f\u539f\u7ebf\u5708\u7684\u531d\u6570\uff08\u531d\uff09 n2\u662f\u526f\u7ebf\u5708\u7684\u531d\u6570\uff08\u531d\uff09\u3002
~~~\u4f60\u7684\u80af\u5b9a\u662f\u6211\u524d\u8fdb\u7684\u52a8\u529b\uff0c\u671b\u91c7\u7eb3~~~
S\uff1f\uff1f\uff1f
1，浮力：一切侵入液体（气体）的物体都受到液体（气体）对它的竖直向上托的力，叫浮力①浮力=物体重力-弹簧示数：F浮=G-F
②浮力=排水量：F浮=G排=ρ液gV排（重要）
③补充露排比法：ρ物∶ρ液=V排∶V物（漂浮时适用，不必死记，它能用②推导出来）
2，机械效率=有用功和总功的比值，公式：η=W有用/W总
有用功：W有用=Gh
总功：W总=FS
额外功：W额=W总-W有用
（机械效率初中一般只针对滑轮问题）
3，热量热传递中传递内能的多少叫热量。单位焦耳，用J表示。
热值：一千克（一立方）的固体燃料（气体燃料）完全燃烧释放的热量。符号q
热值单位：J/kg或J/m^3
热值计算公式：Q=mq或Q=Vq（重要）
比热容：单位物质每1℃温度变化释放或吸收的热量。符号c，单位J/kg.℃。
热量计算公式：Q=cm△t （△t上升时，Q为吸收热量；△t下降时，Q为释放热量。重要）
一、计算浮力一般用到的方法
1.称重法：空气中用弹簧测力计测的示数为F1（即重力G），然后浸入某种液体中测力计的示数为F2，则F浮力=F1-F2。
2.阿基米德原理F浮=ρ液gV排。
3.二力平衡法：当物体漂浮或悬浮在某种液体中时，F浮=G。
二、机械效率的计算
机械效率η=W有/W总
滑轮η=W有/W总=Gh/Fs=G/nF（n为绳子与动滑轮的连接的根数）
或者η=G物/（G轮+G物）（忽略绳子的重力与滑轮之间的摩擦）
斜面η=W有/W总=Gh/Fs（h为斜面的高，s为斜面长）
三、热量：在热传递的过程中传递能量的多少；
公式Q=cmΔt。
η：机械效率=W有/W总=G轮/（G轮+G物）
Q:热量=cmΔt
F：浮力=ρ液gV排（定义）=G（漂浮或悬浮）
差不多就是这些了。。我的笔记比较全的。。我初三~
浮力公式：F=pvg，p为液体密度，v为液体排出的体积，g为重力加速度
机械效率:n=w1/w总，w1为有用功，w总为物体的总功，w总=有用功+无用功
热量：Q=cm(t2-t1) ，c为比热容，（C=Cp/Cv，Cp=Cv+R，R=8.31，Cv=i/2，i为自由度）课外知识，m为质量，t2-t1为温差。
浮力公式：F=PVg
机械效率:n=w/w^
热量：Q=Cm(t2——t1)
F浮=ρ液 g V排（沉底） 或F浮=mg（漂浮或悬浮）
η=W有/W总
滑轮η=W有/W总=Gh/Fs=G/nF（n为绳子与动滑轮连接的根数）
或η=G物/（G轮+G物）（忽略摩擦力）
斜面η=W有/W总=Gh/Fs（h为斜面的高，s为斜面长）
Q=cmΔt（温度变化量）
绛旓細1銆侀熷害锛歏=S/t銆2銆侀噸鍔涳細G=mg銆3銆佸瘑搴︼細蟻=m/V銆4銆佸帇寮猴細p=F/S銆5銆佹恫浣撳帇寮猴細p=蟻gh銆6銆佹诞鍔涳細锛1锛塅娴紳F锛岶锛堝帇鍔涘樊锛夛紱锛2锛塅娴紳G锛岶锛堣閲嶅姏锛夛紱锛3锛塅娴紳G锛堟紓娴佹偓娴級锛涳紙4锛夐樋鍩虹背寰峰師鐞嗭細F娴=G鎺掞紳蟻娑瞘V鎺掋7銆佹潬鏉嗗钩琛℃潯浠讹細F1 L1锛滷2 L2銆8銆佺悊鎯虫枩闈...
绛旓細鍖閫熺洿绾胯繍鍔ㄧ殑浣嶇Щ鍏紡锛歺=vt 鍖鍙橀熺洿绾胯繍鍔ㄧ殑閫熷害鍏紡锛歷=v0+at 鍖鍙橀熺洿绾胯繍鍔ㄧ殑浣嶇Щ鍏紡锛歺=v0t+at2/2 鍚戝績鍔犻熷害鐨勫叧绯伙細a=蠅2r a=v2/r a=4蟺2r/t2 鍔涘鐗╀綋鍋氬姛鐨勮绠楀紡锛歸=fl 鐗涢】绗簩瀹氬緥锛歠=ma 鏇茬嚎杩愬姩鐨勭嚎閫熷害锛歷=s/t 鏇茬嚎杩愬姩鐨勮閫熷害锛毾=胃/t 绾块熷害鍜岃閫熷害鐨...
绛旓細19銆乄鎬=W1+W2+W3鈥︹n锛20銆丳=W/t姝ゅ叕寮忔眰鐨勬槸骞冲潎鍔熺巼锛21銆佸姩鑳藉畾鐞哤鍚=螖Ek=mv2/2-mv02/2锛22銆丒p=kx2/2锛23銆佺幓鎰忚冲畾寰媝1V1=p2V2锛宲V=const锛24銆佺洊路鍚曡惃鍏嬪畾寰嬬殑鎽勬皬娓╂爣琛ㄨ堪Vt=V0(1+t/273)(Vt涓簍鈩冩椂鐨勬皵浣撲綋绉紝V0涓0鈩冩椂鐨勬皵浣撲綋绉)锛25銆佸厠鎷夌弨榫欐柟绋嬶細pV=(m/...
绛旓細1銆佺數娴佸己搴︼細I锛漄鐢甸噺/t 2銆佺數闃伙細R=蟻L/S 3銆佹濮嗗畾寰嬶細I锛漊/R 4銆佺劍鑰冲畾寰嬶細锛1锛塓锛滻2Rt鏅鍏紡)锛2锛塓锛漊It锛漃t锛漊Q鐢甸噺锛漊2t/R (绾數闃诲叕寮)5銆佷覆鑱旂數璺細锛1锛塈锛滻1锛滻2 锛2锛塙锛漊1锛婾2 锛3锛塕锛漅1锛婻2 锛4锛塙1/U2锛漅1/R2 (鍒嗗帇鍏紡)锛5锛塒1/P2锛漅1/R2 6銆...
绛旓細涓銆佸姏瀛﹀熀鏈叕寮忥細锛1锛夊瘑搴︺佽川閲忋佷綋绉殑鍏崇郴锛毾侊功m/V 锛宮=蟻V锛孷= m/蟻 蟻---瀵嗗害--- Kg/m3 锛堝崈鍏嬫瘡绔嬫柟绫筹級銆乵--- 璐ㄩ噺--- Kg锛堝崈鍏嬶級銆 V---浣撶Н--- m3 锛堢珛鏂圭背锛夛紙2锛夐熷害銆佽矾绋嬨佹椂闂寸殑鍏崇郴锛歷锕/t 锛宻=vt锛宼= s/v v---閫熷害--- m锛弒锛堢背姣忕锛夈 s---...
绛旓細鐗╃悊閲 鍗曚綅 鍏紡 鍚嶇О 绗﹀彿 鍚嶇О 绗﹀彿 璐ㄩ噺 m 鍗冨厠 kg m=pv 娓╁害 t 鎽勬皬搴 掳C 閫熷害 v 绫筹紡绉 m/s v=s/t 瀵嗗害 p 鍗冨厠锛忕背?? kg/m?? p=m/v 鍔涳紙閲嶅姏锛 F 鐗涢】锛堢墰锛 N G=mg 鍘嬪己 P 甯曟柉鍗★紙甯曪級 Pa P=F/S 鍔 W 鐒﹁筹紙鐒︼級 J W=Fs 鍔熺巼 P 鐡︾壒锛堢摝锛 w P=W/t...
绛旓細姹傞熷害锛歷=s/t 姹傝矾绋嬶細s=vt 姹傛椂闂达細t=s/v 2銆佸彉閫熺洿绾胯繍鍔ㄧ殑閫熷害鍏紡锛歷=s/t 3銆佺墿浣撶殑鐗╅噸涓庤川閲忕殑鍏崇郴锛欸=mg 锛坓=9.8N/kg锛4銆佸瘑搴︾殑瀹氫箟寮 姹傜墿璐ㄧ殑瀵嗗害锛毾=m/V 姹傜墿璐ㄧ殑璐ㄩ噺锛歮=蟻V 姹傜墿璐ㄧ殑浣撶Н锛歏=m/蟻 4銆佸帇寮虹殑璁＄畻銆傚畾涔夊紡锛歱=F/S锛堢墿璐ㄥ浜庝换浣曠姸鎬佷笅閮借兘閫傜敤...
绛旓細鐢电儹锛歈=W锛堜笌璁＄畻鐢靛姛鐨鍏紡瀹屽叏鐩稿悓,Q琛ㄧず鐑噺锛3銆佸姏瀛︼細a銆佽川閲忎笌瀵嗗害锛歮=蟻v銆恗锛氳川閲,鍗曚綅锛歬g锛浵侊細瀵嗗害,鍗曚綅锛歬g/m^3锛泇锛氫綋绉,鍗曚綅锛歮^3.銆慴銆佸寑閫熺洿绾胯繍鍔細S=vt銆怱锛氳矾绋,鍗曚綅锛氱背锛坢锛夛紱v锛氶熷害,鍗曚綅锛氱背姣忕锛坢/s)锛泃锛氭椂闂,鍗曚綅锛氱锛坰锛夈慶銆佸悓涓鐩寸嚎涓婂悓鏂瑰悜浜屽姏...
绛旓細2锛屾満姊版晥鐜=鏈夌敤鍔熷拰鎬诲姛鐨勬瘮鍊硷紝鍏紡锛毼=W鏈夌敤/W鎬 鏈夌敤鍔燂細W鏈夌敤=Gh 鎬诲姛锛歐鎬=FS 棰濆鍔燂細W棰=W鎬-W鏈夌敤 锛堟満姊版晥鐜囧垵涓竴鑸彧閽堝婊戣疆闂锛3锛岀儹閲忕儹浼犻掍腑浼犻掑唴鑳界殑澶氬皯鍙儹閲忋傚崟浣嶇劍鑰筹紝鐢↗琛ㄧず銆傜儹鍊硷細涓鍗冨厠锛堜竴绔嬫柟锛夌殑鍥轰綋鐕冩枡锛堟皵浣撶噧鏂欙級瀹屽叏鐕冪儳閲婃斁鐨勭儹閲忋傜鍙穛 鐑煎崟浣...
绛旓細鍒濅腑鐗╃悊鍏紡锛歏=S/t锛汫=mg锛浵=m/V锛沺=F/S锛汸=F/s=蟻gh锛汧1L1=F2L2锛泈=Fs=Gh锛沺=W/t=Fv锛浳=W锛汭=U/R=P/U锛沇=Pt绛夈傞噸鍔涘叕寮廏锛漨g(閫氬父g鍙10N/kg锛岄鐩湭浜ゅ緟鏃秅鍙9.8N/kg)鍚屼竴鐗╀綋G鏈堬紳1/6G鍦癿鏈堬紳m鍦版潬鏉嗗钩琛℃潯浠跺叕寮廎1l1锛滷2l2F1/F2锛漧2/l1鍔ㄦ粦杞叕寮忎笉璁＄怀閲嶅拰...
