工程力学双语课件ch02-Resultant-of-Concurrent-Forces-in-a-Plane

s.ChapterObjectives.ponentsofaforce.6.ponentstofindtheresultantoftwoormorevectors.7.Applytheconceptofanegativeforcetothesubtractionofvectors.2.1Introduction.Forcesystem:AgroupofforceswhichactonthesamebodyForcesystemcoplanarforcesystemNon-coplanarforcesystemconcurrentforcesystemparallelforcesystemgeneralcaseforcesystemconcurrentforcesystemparallelforcesystemgeneralcaseforcesystemForcesystem:concurrentforcesystem汇交力系Aforcesystemissaidtobeconcurrent(汇交)monpoint.coplanarNon-coplanar2.1Introduction.2.1Introduction.Forcesystem:Parallelforcesystem平行力系Aparallelforcesystemisoneinwhichtheactionlinesoftheforcesareparallel.2.1Introduction.Forcesystem:Generalcaseforcesystem一般力系2.1Introduction.Equilibrium(平衡):Ifaforcesystemappliedtoabodyproducesnoexternaleffectonthebody,theforcesaresaidtobeinequilibrium