SAT2物理常用公式

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1、SATIIPHYSICSVectorandForcestorque=forcelengthofmomentarmthesumoftheclockwisemoments=thesumofthecounterclockwisemomentsMotionandForcesdistancecoveredaveragespeed=timerequireddisplacementaveragevelocity=timedistancecovered=averagespeedtimeS=vtavchangeinvelocityacceleration=timerequiredforc

2、hangevvfivattMotionwithconstantacceleration(startingfromrest)vv/2avfvatv()gtff1122SatS()gt2222v2(asv2gs)ffvaveragespeedavvfinalvelocityfaaccelerationtelapsedtimesdistancecoveredvvifvav2vvatfi12Svtati222vv2asfiFtchangeinmomentum=masschangeinvelocitymomentum=massvel

3、ocityCentripetalForce2vacr2mvFcr2rvT24ra2TGravitationalFieldsGmm12F2rGMsvrWork,Energy,SimpleMachinesdistanceforceworkgravitationalpotentialenergy=mgh12kineticenergy=mv2forceoffrictionduringmotioncoefficientofslidingfriction=normalworkagainstfriction=frictiondistanceobjectmoves1

4、2elasticpotentialenergy=kx2workpowertimeforcedistancepowertimechangeinlength=oringinallengthcoeff.ofexpansiontemp.changeV11TVT22pVpVV=volume,T=absolutetemperature,P=pressure1122pVpV1122TT12MeasurementofHeatheatrequiredformelting=massHFheatrequiredforvaporization=massHVhe

5、atgianed(orlost)=masssp.ht.temp.change+massmeltedheatoffusion+massvaporizedheatofvaporizationHeatandWork;HeatTransferheatflow=changeininternalenergy+workdonebysystemQ=U+WWaveMotionandSoundPeriodicMotionForastretchedspring:FkxmT2kForwaves:1Tfvf(=wavelength)thenumberof

6、beats=thedifferencebetweenthetwofrequenceClosedPipes=4laVibratingAirColumnsOpenPipes=2la=2lsGeometricalOptics:ReflectionandRefractionForaspecialmirrorthefocallengthisequaltoone-halfoftheradiusofthesphericalshellfR/2LawofRefractionsin1nn(indexofrefraction)sin2speedoflightin

7、vacuum(orair)nspeedoflightinthesubstancensin21nsin12ImagesFormedbyLenses111objectdistanceimagedistancefocallength111didofsizeofimageimagedistancemagnificationm()sizeofobjectobjectdistanceOBJECTDISTANCEIMAGECHARACTERISTICSConvexLens(orConcaveMirror)gr