哈工大理论力学第七版答案-第一章.pdf

1 第第1章 静力学公理和物体的受力分析章 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。 P 2N F 1N F A (a) (a1) P N F A T F (b) (b1) PB A 2N F 3N F 1N F (c) (c1) A B 2 P 1 P Ax F Ay F T F (d) (d1) F B F A F BA (e) (e1) 2 AB F Ax F B F Ay F q (f) (f1) A B F C C F A F (g) (g1) A C 1 P C F Ax F Ay F B 2 P (h) (h1) B F C Ax F A D C F Ay F (i) (i1) (j) (j1) A B C P Ax F Ay F B FF (k) (k1) 3 C A CA F AC F BA F AB F B A P AC F AB F (l) (l1) (l2) (l3) 图 1-1 1-2 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。 2N F 2 P C N F (a) (a1) 1 P 1N F 2N F Ax F Ay F 2 P C A B 1 P 1N F Ax F A N F B Ay F (a2) (a3) 2 P 1 P A 1N F 3N F 2N F B (b) (b1) 1 P A1N F N F 2 P 3N F N F 2N F B (b2) (b3) 4 B 1N F A 2 P Ax F Ay F D C 2N F 1 P (c) (c1) 1 P B 1N F D 2N F T F A 2 P Ax F Ay F T F (c2) (c3) B AC D C F Ay F q B F Ax F (d) (d1) AC D C F Ay F q Ax F Dy F Dx F B D B F q Dx F Dy F (d2) (d3) AB C P q Ax F Ay F Cy F Cx F A B q Ax F Ay F Bx F By F B C P Cx F Cy F Bx F By F (e) (e1) (e2) (e3) C AB 2 F By F Bx F Ax F Ay F 1 F (f) (f1) 5 C A Ax F Ay F 1 F Cx F Cy F C B 2 F By F Bx F Cx F Cy F (f2) (f3) P B F Ay F Ax F A C B (g) (g1) B F Ay F Ax F A C B T F Cx F D P C Cx F Cy F T F (g2) (g3) B Ax F Ay F A B F 1 F D B Cx F Cy F C B F 2 F (h) (h1) (h2) A O C Oy F Ox F Cx F Cy F Ax F Ay F CD F Cy F Cx F E FA B E (i) (i1) (i2) 6 A B O C Oy F Ox F Bx F By F D F E A B Bx F By F E F Ax F Ay F (i3) (i4) A B C H ED P Ay F Ax F Bx F By F B C By F Bx F Cy F Cx F T F (j) (j1) (j2) D2T F 1T F Dy F Dx F E 2T F 3T F Ex F Ey F A D Ax F Ay F Dy F Dx F E C Cy F Cx F Ex F Ey F (j3) (j4) (j5) B B F C F DE F Cy F Cx F E (k) (k1) A B B F C F Ay F Ax F E D A Cy F C F Ay F Ax F DE F Cx F D 90 (k2) (k3) D E 7 A B A F B F C F C BD D F 1 F B F (l) (l1) (l2) E E F 2 F D D F A B C D E 2 F 1 F A F C F E F (l3) (l4) 或 B C C F Dy F Dx F 1 FB F D D E Dy F Ey F Ex F Dx F 2 F A B C D E 2 F 1 F A F C F Ey F Ex F (l2) (l3) (l4) C Cy F 1 F Cx F B A AD F (m) (m1) E F E AD F D H F H 2 F AD F AD F A D (m2) (m3) 8 B O A Ox F Oy F BN F AN F k F (n) (n1) D q 1N F 3N F 2N F B F B (n2