文档介绍：开网店找创业先锋QQ764123858第1章静力学公理和物体的受力分析1-1画出下列各图中物体A,ABC或构件AB,AC的受力图。未画重力的各物体的自重不计,所有接触处均为光滑接触。FN1APFN2(a)(a1)FTAPFN(b)(b1)AFN1PBFN3FN2(c)(c1)FTBFAyP1PAF2Ax(d)(d1)FFAFBAB(e)(e1)1开网店找创业先锋QQ764123858qFFAyFBFAxAB(f)(f1)FBCFCFAA(g)(g1)AFAxBPP12(h)(h1)BFCFCFDAxAFAy(i)(i1)(j)(j1)BFBFCPFAyFAxA(k)(k1)2开网店找创业先锋QQ764123858FCAFABF′CAACFAB′BFACFABAP(l)(l1)(l2)(l3)图1-11-2画出下列每个标注字符的物体的受力图。题图中未画重力的各物体的自重不计,所有接触处均为光滑接触。CFN2F′P2N(a)(a1)BFN1BFN1CFN2FNP2P1P1FAyFAyFAxFAAAx(a2)(a3)FN1AP1BFN3P2FN2(b)(b1)FN′FN3FN1ABP2P1FFNN2(b2)(b3)3开网店找创业先锋QQ764123858FAyAFAxCDFN2BP2P1FN1(c)(c1)FAyFTAFAxDFT′FN2BP1FPN12(c2)(c3)FAyFqBACBFAxDFC(d)(d1)FAyFDyFBqqD′BACFDxFAxFDxDFF′CDy(d2)(d3)FAyqFBx′BFFAyAxqAB′FFByAxFFCyCxCPABFBxPCFCxFByFCy(e)(e1)(e2)(e3)F1CF2FAyFByAFFBAxBx(f)(f1)4开网店找创业先锋QQ764123858FCxCFCx′CF1FF′FFAyCyCy2FByFAFBxAxB(f2)(f3)FFAyBCBAFAxP(g)(g1)FCy′xFAyFBFFDTCAxBAFCxP(g2)(g3)DF1FCyFBFB′F2BCFCxBFAyFAAx(h)(h1)(h2)AFAxFAyFCyFCxCF′FCyAEFFOyCDFOxFCx′EOB(i)(i1)(i2)5开网店找创业先锋QQ764123858AAFAx′F′FAy′EFECDFByFByFOyFFBxOOxFBxBB(i3)(i4)FAyDEAFCxFCAxCFFTByHFByFCyBPFFBxBBx(j)(j1)(j2)FAyFDy′FEy′F′T2EFCFCx′DFT2AxFEx′FExADFDx′EFDxFT3FT1FFF′DyEyCy(j3)(j4)(j5)EFFBCEDFCx′BθF′F′CyDE(k)(k1)FFBFCBFCxθECFCy90°−θFDEDDFAyFAyAFAFAxAx(k2)(k3)6开网店找创业先锋QQ764123858FBF1FB′FBDBDACFFAC(l)(l1)(l2)F2DFD′F1FD2BACEEFFFFEACE(l3)(l4)或FDy′F2FFB′FF1F1DyD2FDx′BDFDxDBFExACECEFExFFFAFCFCEyEy(l2)’(l3)’(l4)’F′ADAFCyFCxCF1B(m)(m1)FADDFHADEF2ADFFF′EHAD(m2)(m3)7开网店找创业先锋QQ764123858AFNAFkFNBFOyFOxBO(n)(n1)FN1BDqFB′FN2FN3(n2)FBDFFFCFEAGCEFGA(o)(o1)FBBDFDFBFEFCFDF′AFF′CDFFABE(o2)(o3)(o4)图1-28开网店找创业先锋QQ764123858第2章平面汇交力系与平面力偶系2-1铆接薄板在孔心A,B和C处受3个力作用,如图2-1a所示。F1=100N,沿铅直方向;F3=50N,沿水平方向,并通过点A;F2=50N,力的作用线也通过点A,尺寸如图。求此力系的合力。ycF3dF2F1Fb2FFFA3x1R60θa(a)(b)(c)图2-1解(1)几何法作力多边形abcd,其封闭边ad即确定了合力FR的大小和方向。由图2-1b,得22FR=(F1+F2×4/5)+(F3+F2×3/5)=(100N+50N×4/5)2+(50N+50N×3/5)2=161NF1+F2×4/5∠(FR,F1)=os()FR100N+50N×4/5=os()==29o44′161N(2)解析法建立如图2-1c所示的直角坐标系Axy。∑Fx=F1+F2×3/5==50N+50N×3/5=80N∑Fy=F1+F2×4/5=100N+50N×4/5=140NFR=(80i+140j)N22FR=(80N)+(140N)=161N2-2如图2-2a所示