九年级物理所有公式 九年级物理所有公式?

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=UIt
=I^2Rt=U^2t/R
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UI=I^2R=U^2/R
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1nm=10^-9m,1mm=10^-3m,1cm=10^-2m;1dm=0.1m,1Km=10^3m,1h=3600s,1min=60s,
1Kwh=3.6\u00d710^6J
1Km/h=5/18m/s=1/3.6m/s
1g/cm^3=10^3Kg/m^3
1cm^2=10^-4m^2
1cm^3=1mL=10^-6m^3,1dm^3=1L=10^-3m^3,
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以下内容涵盖了所有初中物理的公式及其他知识要点:
公式
1.速度v=s/t; 2.密度ρ=m/v; 3.压强P=F/s=ρgh;
4.浮力F=G排=ρ液gV排=G(悬浮或漂浮)=F向上-F向下=G-F’ ;
5.杠杆平衡条件:F1L1=F2L2;6.功w=Fs=Gh(克服重力做功)=Pt;7.功率p=W/t=Fv;
8.机械效率η=W有/W总=Gh/Fs=G/nF=G/(G+G动) =fL/Fs(滑轮组水平拉物体克服摩擦力作功);
9.热量:热传递吸放热Q=cm△t;燃料完全燃烧Q=mq=Vq;电热:Q= I^2Rt
10.电学公式:电流:I=U/R=P/U 电阻:R=U/I=U^2/P 电压:U=IR=P/I
电功:W=Pt =UIt =I^2Rt=U^2t/R 电热:Q= I^2Rt(焦耳定律)=UIt=U^2t/R
电功率:P=W/t= UI=I^2R=U^2/R
串联电路特点:I=I1=I2,U=U1+U2,R=R1+R2 U1:U2=P1:P2=Q1:Q2=W1:W2=R1:R2
并联电路特点:I=I1+I2,U=U1=U2,1/R=1/R1+1/R2 I1:I2=P1:P2=Q1:Q2=W1:W2=R2:R1
物理量的国际单位
长度(L或s):米(m)
时间(t):秒(s)面积(S):米2(m2)体积(V):米3(m3)速度(v):米/秒(m/s)温度(t):摄氏度(℃)(这是常用单位)
质量(m):千克(Kg)密度(ρ):千克/米3(Kg/m3)。力(F):牛顿(N)功(能,电功,电能)(W):焦耳(J)
功率(电功率)(P):瓦特(w)压强(p):帕斯卡(Pa)机械效率(η)热量(电热)(Q):焦耳(J)
比热容(c):焦耳/千克 摄氏度(J/Kg℃)热值(q):J/kg或J/m3
电流(I):安培(A)电压(U):伏特(V) 电阻(R):欧姆(Ω)。
单位换算
1nm=10^-9m,1mm=10^-3m,1cm=10^-2m;1dm=0.1m,1Km=10^3m,1h=3600s,1min=60s,
1Kwh=3.6×10^6J 1Km/h=5/18m/s=1/3.6m/s 1g/cm^3=10^3Kg/m^3 1cm^2=10^-4m^2
1cm^3=1mL=10^-6m^3,1dm^3=1L=10^-3m^3,
词冠:m毫(10^-3),μ微(10^-6),K千(10^3),M兆(10^6)

换几个字母表示,就是:
X=α×β×γ×δ × A×B×C×ΔD
系数 物理量

以下内容涵盖了所有初中物理的公式及其他知识要点:
公式
1.速度v=s/t; 2.密度ρ=m/v; 3.压强P=F/s=ρgh;
4.浮力F=G排=ρ液gV排=G(悬浮或漂浮)=F向上-F向下=G-F’ ;
5.杠杆平衡条件:F1L1=F2L2;6.功w=Fs=Gh(克服重力做功)=Pt;7.功率p=W/t=Fv;
8.机械效率η=W有/W总=Gh/Fs=G/nF=G/(G+G动) =fL/Fs(滑轮组水平拉物体克服摩擦力作功);
9.热量:热传递吸放热Q=cm△t;燃料完全燃烧Q=mq=Vq;电热:Q= I^2Rt
10.电学公式:电流:I=U/R=P/U 电阻:R=U/I=U^2/P 电压:U=IR=P/I
电功:W=Pt =UIt =I^2Rt=U^2t/R 电热:Q= I^2Rt(焦耳定律)=UIt=U^2t/R
电功率:P=W/t= UI=I^2R=U^2/R
串联电路特点:I=I1=I2,U=U1+U2,R=R1+R2 U1:U2=P1:P2=Q1:Q2=W1:W2=R1:R2
并联电路特点:I=I1+I2,U=U1=U2,1/R=1/R1+1/R2 I1:I2=P1:P2=Q1:Q2=W1:W2=R2:R1
物理量的国际单位
长度(L或s):米(m)
时间(t):秒(s)面积(S):米^2(m^2)体积(V):米^3(m^3)速度(v):米/秒(m/s)温度(t):摄氏度(℃)(这是常用单位)
质量(m):千克(Kg)密度(ρ):千克/米^3(Kg/m^3)。力(F):牛顿(N)功(能,电功,电能)(W):焦耳(J)
功率(电功率)(P):瓦特(w)压强(p):帕斯卡(Pa)机械效率(η)热量(电热)(Q):焦耳(J)
比热容(c):焦耳/千克 摄氏度(J/Kg℃)热值(q):J/kg或J/m^3
电流(I):安培(A)电压(U):伏特(V) 电阻(R):欧姆(Ω)。

单位换算
1nm=10^-9m,1mm=10^-3m,1cm=10^-2m;1dm=0.1m,1Km=10^3m,1h=3600s,1min=60s,
1Kwh=3.6×10^6J 1Km/h=5/18m/s=1/3.6m/s 1g/cm^3=10^3Kg/m^3 1cm^2=10^-4m^2
1cm^3=1mL=10^-6m^3,1dm^3=1L=10^-3m^3,
词冠:m毫(10^-3),μ微(10^-6),K千(10^3),M兆(10^6)

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