高中物理必背知识点实用口诀TXT手机版Practical tips for high school physics TXT.docx
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高中物理必背知识点实用口诀TXT手机版PracticaltipsforhighschoolphysicsTXT
高中物理必背知识点实用口诀(TXT手机版)(Practicaltipsforhighschoolphysics(TXT))
1.Descriptionofmovement
1.Objectmodelwithparticlesize,ignoreshapeandsize;Theearthturnstobeaparticle,theearth'srotationisaboutthesize.Thechangeoftheobjectposition,accuratedescriptionwithdisplacement,speedSmovementthant,withΔvandtthana.
2.Usinggeneralformula,averagevelocityissimplemethod,intermediatetimevelocitymethod,initialvelocityzeroratiomethod,andgeometricimagemethod,tosolvethemethodofmotion.Thefreefallisaninstance,theinitialvelocityiszeroa,etc.Thespeedofthecentermomentisequaltotheaveragevelocity;Accelerationhasagoodside,ΔSaTsquare,etc.
3.Thevelocitydeterminesthemotionoftheobject,inthedirectionoftheaccelerationofthevelocity,thesamedirectionisacceleratedbackward,andtheverticalturningisthesame.
Second,theforce
1.Forceanalysisisthekeytosolvemechanicalproblems;Analyzetheforceofforceanddealwithitaccordingtotheeffect.
2.Theanalysisforceshouldbecareful,quantitativecalculationofsevenforces;Theforceofgravityisdeterminedbytheforceofgravity.Thereiselasticityandfriction,relativemotionisthebasis;Theforceofgravityisdefiniteinallthings.Lorenzforce,theessenceisunity;Verticalforceisthelargest,parallelinabilitytoremember.
3.Thecalculationresultisonly"quantity"inthesamedirection.Thetwoforcesaresmallandlarge,twoforcesareq-angleclip,parallelogrammethod;Theresultantforcesizevarieswithq,onlyinthemaximumminimum,andtheforceoftheforceiscombinedtotheotherside.
Themulti-forceproblemstate,orthogonaldecompositiontosolve,trigonometricfunctionscanberesolved.
4.Multiplemethodsofmechanicalproblems,integralisolationandhypothesis;Allyouneedtodoislookattheexternalforceandsolvetheinternalforceisolation.Thestateisthesameasthewhole,otherwiseitismuchmoreisolated;Evenifthestateisdifferent,thewholecowiicanbedone;Supposethatsomeforceisorisnot,andisdeterminedaccordingtothecalculation;Thelimitmethodgrabsthecriticalstate,theprocedurallawisdoneinorder;Orthogonaldecompositioncoordinates,theaxialvectorisasmuchaspossible.
Newton'slawsofmotion
1.Fandotherma,Newtontwolaw,produceacceleration,becauseofforce.
Sothenetforceisgoinginthesamedirectionasa,sothevelocityvariableisgoingtobeequaltoa,soit'sgoingtobeasmaller,butit'sgoingtobegreaterthanu,soit'sgoingtobeequaltou.
2.TheforceofNandTdependsontheweight,andthemgproductistherealweight.Heavyweightlossisregardedasheavy,andtheinvariantisrealweight;Accelerationisoverweight,decelerationisalsooverweight;Weightlessnessisdeterminedbyaddinganddecreasing,completelylosingattentiontozero
Four,curvemotion,gravitation
1.Themotiontrajectoryisthecurve,thecentripetalforceexistsasthecondition,thecurveischanging,thedirectionisthetangentline.
2.Thecircularmotioncentripetalforce,thesupplyanddemandrelationintheheart,theradialforceprovidesthefoot,needsmusquaredoverR,MRWsquarealsoneeds,thesupplyanddemandbalanceisnotdisoriented.
Gravitationisbornofmassandexistsinalloftheworld.Satellitesorbitthecelestialbody,andthefastandslowmotionofthesatelliteisdeterminedbydistance,thecloseritis,thefasteritgoes,thefartheritgoes,thesloweritgoes,thespeedofthesynchronoussatelliteisfixed,andthesatelliteistravelingovertheequator.
Mechanicalenergyandenergy
1.Determinethestateforkineticenergy,
Theanalysisprocesslooksfortheforcework,plusthepositiveandnegativeworktogether,thekineticenergyincrementisthesameasthat.
It'sclearthatthetwostatemechanicalenergy,theprocessforceisdoingwork,the"gravity"iszero,theinitialstateenergyisthesame.
3.Determinethestatetofindtheamountofenergy,andthenlookattheprocessforcetodowork.Sothere'sachangeinenergy,andtheinitialstateenergyisthesame.
6.Electricfield
1.Coulomb'slawchargeforce,gravitationalattractionforce,asifitisthetwinbrother,kQqandrsquaredratio.
2.Thereisanelectricfieldaroundthecharge,andFisstrongerthanq.KQismorethanr2,andUisequaltotheelectricfield.
Theintensityoftheelectricfieldisthevector,theforceofthepositivechargeisfixed.Descriptionoftheuseofelectricfield,thedensityofweakandstrong.
Thefieldenergyiselectricpotentialandthefieldlineisdecreasing.TheworkoffieldforceisqU,thekineticenergytheoremcannotbeforgotten.
4.Theelectricfieldhasequipotentialsurface,whichisperpendiculartothefieldline.Thedirectionislowwithhighdirection,andthesurfacedensityischaracteristic.
7,constantcurrentisoptional3-1
Whenthechargeismoving,thecurrentisequaltoqovert.Thefreechargeistheinternalcause,andthevoltageonbothendsisthecondition.
Thepositiveloadflowdirectionisdetermined,andtheflowmeterismeasured.Theexternalcurrentofthepowersupplyisnegative,fromnegativetoserious.
2.Threefactorsofresistancelaw,thetemperatureisconstant,thecontrolvariableisdiscussed,rlratiosandotherresistance.
ThecurrentisdoingtheworkUIt,theelectrothermalIsquaredRt.Electricpower,Wratiot,voltagetimescurrentisalso.
3.Basicelectricpathlinkingandseparatingpressureshunt.Complexcircuitsusethebrain,theequivalentcircuitisthekey.
4.Partialcircuitofclosedcircuit,externalcircuitandinternalcircuit,followedbyohm.
Pressuredropintheterminalvoltage,andtheelectromotiveforce,exceptthetotalresistancecurrentis
8,3-1
Thereisamagneticfieldaroundthemagnet,andtheforceoftheNisdetermined.Thereisamagneticfieldaroundthecurrent,andamperesetthedirection.
2.FratioIlisthefieldintensity,phiandotherBSmagneticflux,magneticfluxdensityphiratioS,thenameofmagneticfieldstrengthisdifferent.
3.BILampereforce,perpendiculartoeachother.
Lorentzforce,theforceoftheforcetotheleft.
9.Electromagneticinduction(3-2)
1.Electromagneticinductionmagneticinduction,fluxvariationisacondition.Thecircuitcloseswithacurrent,andthecircuitbreakeristhepowersupply.
Theinductionelectromotiveforcesize,thefluxrateoffluxisknown.
2.Thedirectionoflenz'slawisthekeytopreventchange.Conductorscutthemagneticline,andtherighthandruleismoreconvenient.
3.Lenz'slawisabstract,whichreallyunderstandsfromthethreeparties,hinderstheincreaseanddecreaseofthemagneticflux,andtherelativemotionisresisted,theself-inductancecurrentwantstostop,theenergyconservationshouldbe.Youlookatthemagneticfieldinthefirstplace,wheretheinducedmagneticfieldisgoingtogoup,andallthemagneticfluxincreasesordecreases,andtheamperesetisknowntotheI.
10.Alternatingcurrent(3-2)
1.Theuniformmagneticfieldhascoils,rotatingtogeneratealternatingcurrent.Thecurrentvoltageelectromotiveforce,thechangeruleisthestring.
Theneutralsurfacetimeissine,paralleltimeiscosine.
2.NBSomegaisthemaximumvalueandtheeffectivevalueiscalculatedwithheat.
3.
Transformerforacuse,constantcurrentcannotbeused.
Idealtransformer,primaryUIvalue,secondaryUIvalue,equalityisprinciple.
Ratioofvoltagetoratioofturns;Theratioofthecurrenttotheratioofturns.
Applytheratioofvariable-pressureratio,ifyouwanttofindthenumberofturns,turnitintotheturns.
Farawayfromthepowertransmission,thevoltagedropissent,otherwisetheuserwilllowerthepressure.
11.Gaseousequation:
3-3
Studythequalityofthegasanddeterminethestatusoftheparameters.TheabsolutetemperatureisthevolumeofT,volumeisvolume.
Pressureanalysis,Newton'slawforyou.Thestateparametermustbefound,PVisequaltoT.
12.Lawsofthermodynamics
Thefirstlawofthermodynamics,theconservationofenergy.Howmuchinternalenergychange,howmuchheatyoucando.
Positiveandnegativesignsneedtobeaccurate,incomeexpendituretounderstand.Theinternalenergyandheatabsorptionarepositive.Externalworkandheatreleasecanreducenegativevalues.
2.Secondlawofthermodynamics,heattransferisirreversible,heattransferandheattransferwork,withdirectivity.
13,mechanicalvibrations3-4
ThesimpleharmonicvibrationshouldkeepinmindthatOisthedisplacementofthestartingpoint,thedirectionoftherecoveryforce,alwaysintheequilibriumposition,
Themagnitudeisproportionaltothedisplacement,andtheequilibriumpositionisu.
2.Opointsymmetrydon'tforget,vibrationstrengthistheamplitudeofvibrationspeedisacycle,thecycle,4awalkpendulumcyclethanlg,n-throotby2p,againplacecyclefor2secondsseconds,setaboutlengthof1meterlong.
Tothecenterofthecenterofmass,thependulumhasequaltime.
3.Thedirectionofthevibrationimageistracedfromthebottomtothetop,fromtoptobottom;Thedisplacementofthevibrationimage,thegreatdisplacementofthebasepoint,thepositiveandnegativesigndirection.
14.Mechanicalwave(3-4)
1.Ontheleft,ontherightandontheright.Thepeakpointhasnodirection.
2.Followthedirectionofcommunication,fromthevalleytothepeakoftheclimb,thebottomofthefootmustpushdown,upanddowntomove.
3.Theimagesofdifferenttime,fourpointsΔtoneorthree,particlemovementdoubts,Sandv