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ID:33158807
大小:2.05 MB
页数:197页
时间:2019-02-21
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1、ForcesandMotionForStudentsofBaldwinWallaceCollegeSpringSemester2011Monday–Wednesday10:00–11:15amRoom139WilkerFacultyRichardHeckathornThematerialsforthiscoursewereorganizedandeditedbyRichardHeckathornusingmaterialsfromaprogramcalledOperationPhysicsandincludesmaterialsd
2、evelopedbyhim.TheoriginalOPERATIONPHYSICSactivitysequencetoimprovephysicsteachingandlearninginupperelementaryandmiddleschoolswasfundedbytheNationalScienceFoundation.OriginalMaterialCopyright1992byAmericanInstituteofPhysicsMaterialseditedandphotoduplicatedwithpermissio
3、n.AllRightsReserved2-18-2010RichardHeckathornForcesandMotion3of197FORCES&MOTIONINTRODUCTIONWORKSHOPLEADER’STOPICINFORMATIONINTRODUCTIONTOFORCES&MOTIONAnunderstandingofforceandmotionisfundamentaltothestudyofalmostallotherphysicsrelatedtopics.Yetitisatopicoftenoverlook
4、edoronlycursorilyintroducedinelementaryandmiddleschoolscience,eventhoughitisatopictypicallyidentifiedforinclusioninthecurriculumforthesegrades.Aprimaryreasonforthisisthatmanyteachersdonotfeelcomfortableabouttheirownunderstandingofthetopic.Consequently,thismaybethemost
5、neededofalloftheOPERATIONPHYSICSworkshops.Thisworkshopleader’snotebookisdividedintotwoparts:PARTONEMotionPartOnebeginsbyintroducingparticipantstotheconceptsofspaceandtime.Theseconceptsarethenusedindescribingsimpletypesofmotion.Thesemotionsarethenclassifiedasaccelerate
6、dandnotaccelerated(constantvelocity).Emphasisisplacedondistinguishingbetweenspeedandvelocity,betweenaverageandinstantaneousvaluesandonacceleratedmotion.Thissectionshouldnotbeskipped,foritdevelopsideasnecessarytotheunderstandingofotherideaswhichareintroducedinthesectio
7、nonforce.PARTTWOForcesPartTwofocusesonthenatureofforceandtheeffectofforcesonthemotionofobjects.Itbeginsbylookingatmotioniftherewerenoforces(inertialeffects),thendevelopsthebasicconceptofwhatforceis.Motionundertheinfluenceofbalancedandunbalancedforcesfollows.Similariti
8、esamongdifferentkindsofforcesisaddressedbriefly.Finally,action/reactionpairsandtheeffectofanetcentripetalforcearestudied.Thr
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