高中物理追击和相遇问题专题学案（high school physics, pursuit and encounter problems, special case study）

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1、高中物理追击和相遇问题专题学案（Highschoolphysics,pursuitandencounterproblems,specialcasestudy）Topics:pursuitandencounterinrectilinearmotionFirst,theessenceoftheencounterandpursuitTheproblemofstudyingwhethertwoobjectscanarriveatthesamespatialpositionatthesametime.Two,thekeytosolvingt

2、heproblemofencounterandpursuitDrawamotionpictureoftheobject,andclearupthethreerelations(1)timerelation:(2)displacementrelation:(3)velocityrelation:Thetwospeedsareequal.Ittendstobethemaximumandminimumcriticalconditionbetweenobjects,andisthestartingpointforanalysisandju

3、dgment.Three,pursuitandencounterproblemsanalysismethods:A.drawsaschematicdiagramoftwoobjects.Accordingtothenatureofthemotionofthetwoobjects,thesamereferenceobjectisselected,andthedisplacementequationsofthetwoobjectsarelisted;B.findouttherelationbetweenthetwoobjectsint

4、hetimeofmovementC.findoutthequantitativerelationbetweenthetwoobjectsonthemovementdisplacementD.simultaneousequationsaresolvedDescription:criticalconditionsusedinpursuitproblems:Thespeedofthesmallhighspeedchase,catchuptotwoobjectsofequalspeed,maximumdistance;Thespeedof

5、largedecelerationrateofcatch-upsmall,catchupontwoobjectsisequaltothevelocity,thedistance.Thatmustbepriortocatchup,otherwiseitcannotcatchup.Four,typicalexampleanalysis:(1)uniformacceleratedmotion(v1

6、mumdistancebetweenthetwo;v1>v2,thedistancebetweenthetwosmaller,meetmeetx1=,x2+,Delta,x,thewholemeetingonly(thatis,catchup)once.[1]withacarstartsfromrestandrunningwiththeaccelerationofthe3m/s2,justabicyclefromthecarspeedpassingataspeedof6m/s.Requirements:(1)thecarfromt

7、hestarttocatchupwiththebicyclebeforelongtimebothfar?Whatisthedistancehere?(2)whendoesthecarcatchthebike,andwhatisthespeedofthecar?ThelawissolvedaccordingtothelawofuniformvelocitychangeMethodtwousesrelativemotiontosolveMethodofthreepolevalueMethodfourimagemethod(two).A

8、ftertheuniformmotionwithconstantaccelerationconditions(beginningv1>V2):v1>V2,thedistancebetweenthev1=becomessmaller;V2,ifx2+