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1、摩擦力初中物理1.,twokindsofchargeandchargeconservationlaw,elementcharge(e=l.60*10T9C)2.Coulomb'slawF=KQlQ2/r2(invacuum)*F=KQ1Q2/epsilonR2(inamedium)$Y:{07;;forceC-.HF:betweenpointcharge(N)〃}8Q5C!E6a&D2J_#)K:staticpowerconstantK=9.0*109N=m2/C2,QI,Q2:,two-pointcharge(C)(S4,B)N7,P
2、.,X+,T,epsilon:dielectricconstant,r:,thedistancebetweentwocharges(m),ontheirlines,thesamechargesrepeleachother,andtheexoticchargesattracteachother.3.electricfieldintensityE=F/q(definition,calculation)E:electricfieldintensity(N/C)Q:checktheelectriccharge(C)isavector〃4・poi
3、ntchargeelectricfieldofE=KQ/r2vacuumformed0&L+U3Z&Q8G+G+Z
4、&R:thedistancefromthepointchargetotheposition(m)(Q〜厂o%,W]5,JQ:throughtheelectriccharge5.electricfieldforceF二qEY;V,Y-pF:!~/'*electricforce(N)chargeq:byelectricfieldforcepower(C)electricfieldintensityE:(N/C)6.UA二eA
5、/qUAB二UA-potentialandpotentialdifferenceUBUAB二WAB/q二-deltaepsilonAB/q7.,theelectricfieldforcedoesworkWAB=,qUAB,C,WAB:,thechargedbodyfromAtoB,theworkdonebytheelectricfieldforce(J),theq:(electriccharge)$G‘?&E*,W,D5@Thepotentialdifferencebetweentwopoints,theABUAB:field(V)(i
6、ndependentoftheelectricforceactingandpath)8.electricpotentialenergyepsilonA=qUAepsilonA:theelectricpotentialenergyofchargedbodyatApoint(J),q:electricenergy(C),UA:Apointelectricpotential(V)9.thechangeofelectricpotentialenergy,deltaepsilonAB二epsilonB-epsilonA(thedifference
7、ofelectricpotentialenergybetweenchargedbodyinelectricfieldfromApositiontoBposition)10.,theworkofelectricfieldforceandthechangeofelectricpotentialenergyAB二-WAB二-qUAB(theincrementofelectricpotentialenergyisequaltothenegativevalueoftheworkdonebyelectricfieldforce)The11.capa
8、citorC二Q/U(definition,formula)C:(F)Q:powercapacitor(C)U:voltage(twoelectrodepotential)(V)12.,thefieldstrengthofuniformelectricfield,E二UAB/d,UAB:AB,voltagebetweentwopoints(V),d:AB,distancebetweentwopointsinfielddirection(m)13.accelerationofchargedparticlesinanelectricfiel
9、d(Vo二0),W二，EK,qu=mVt2/2,Vt二(2qU/m)1/214.thedeflectionofchargedparticlesalongaverticalelectricfieldintoa
