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1、What’sitaboutCHAPTER1Introduction1.1What’sitaboutThisisabookabouttheMechanicsofSolids,Statics,theStrengthofMaterials,andElas-ticityTheory.Butthatdoesn’tmeanathingunlessyouhavehadacourseintheMechanicsofSolids,Statics,theStrengthofMaterials,orElasticityTheory.Iassumeyouhavenot;letustryag
2、ain:Thisisabookthatbuildsuponwhatyouweresupposedtolearninyourbasicphysicsandmathe-maticscourseslastyear.Wewilltalkaboutforces–notpolitical,butvectorforces–aboutmomentsandtorques,reactions,displacements,linearsprings,andtherequirementsofstaticequilibriumofaparticleorarigidbody.Wewillsol
3、vesetsoflinearalgebraicequationsandtalkaboutwhenwecannotfindauniquesolutiontoasetoflinearalgebraicequations.Wewillderiveawholeraftofnewequationsthatapplytopar-ticles,bodies,structures,andmechanisms;thesewilloftencontainthespatialderivativesofforces,moments,anddisplacements.Youhaveseenag
4、oodbitofthebasicstuffofthiscoursebefore,butwewillnotassumeyouknowthewaytotalkabout,orworkwith,theseconcepts,principles,andmethodssofunda-mentaltooursubject.Sowewillrecastthebasicsinourownlanguage,thelanguageofengineeringmechanics.Forthemoment,thinkofthisbookasalanguagetext;ofyourselfas
5、alanguagestudentbeginningthestudyofEngineeringMechanics,theMechanicsofSolids,theStrengthofMaterials,andElasticityThe-ory.Youmustlearnthelanguageifyouaspiretobeanengineer.Butthisisadifficultlanguagetolearn,unlikeanyotherforeignlanguageyouhavelearned.Itisdifficultbecause,onthesurface,itapp
6、earstobealanguageyoualreadyknow.Thatisdeceptive:Youwillhavetobeonguard,carefulnottopresumethewordyouhaveheardbeforebearsthesamemeaning.Wordsandphrasesyouhavealreadyencounterednowtakeonamorespecialand,inmostcases,narrowermeaning;acoupleofforcesismorethanjusttwoforces.Animportantpartofle
7、arningthevocabulary,isthequicksketch.Alongwithlearningtosketchintheengineeringmechanicsway,youwillhavetolearnthemeaningofcertainicons;asmallcircle,forexam-ple,becomesafrictionlesspin.Sotoo,grammarandsyntaxwillbecrucial.Rigorousrulesmustbelearnedandobeyed.Someoftheseruleswillatfirstsee
