第一章：静力学公理和物体的手里分析.docx

理论力学（第七版）课后题答案 哈工大.高等教育出版社

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。

9

FN1
A

P

FN 2

(a) (a1)

FT

A

P

FN

(b) (b1)

A FN1

P B


FN 3

(c) (c1)
FN 2

FT B

FAy

A

P1
P2
FAx

(d) (d1)

FA F FB

A B
(e) (e1)

q

F

FAy FB

FAx
A B

(f) (f1)

F

B

A
C FC

FA

(g) (g1)

FAy

A
FC

C

FAx B
P1 P2

(h) (h1)
B
F

C

FC

D
A
FAy
FAx

(i) (i1)

(j) (j1)
B
FB F

C

FAy

A
P

FAx

(k) (k1)

FCA

C


FAC
A


B
FBA
FAB

A


FA′C

FA′B

P

(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。

C

FN′ P2
FN 2

(a) (a1)
B FN 1
B FN1

C

P2
P1

FAy

A
FN 2

FAx

FN

P1 FAy

A


FAx

(a2) (a3)

FN1 A

P1
B

P2


FN 3

(b) (b1)
FN′
FN 2

FN1 A
B FN 3

P2

P1
FN FN 2
(b2) (b3)

FAy

A FAx

C

P1

FN1

D
FN 2

P2

(c) (c1)
FAy

D
FN 2
B
P
1
A

FT′
FAx

FN1
P2
(c2) (c3)

FAy

A
q FB

B
FAx C D
FC

(d) (d1)

FAy

A


FAx

q

C FDx
FC
FDy

D


D

FD′y
q FB

FD′x B

(d2) (d3)

FAx
FAy
q


FAy
q

FB′x B

FCy

C
A B

P

FCx
FAx


A B

FBy


FBx

FCx

C P

FCy
FB′y

(e) (e1) (e2) (e3)

F1

FAy
C

F2
FBy

A B

FAx

(f) (f1)
FBx

F1

FAy

A


FAx
FCx

C

FCy

C

FC′y
FC′x

F2


FBy

B


FBx

(f2) (f3)

FAy

A
FB

C
B
FAx

P

(g) (g1)

FAx


FAy

A


FB
D FT C
B
FCx
FC′y
FT
C Cx

P

(g2) (g3)

F1

FB′
B
D

FCy

C


FB

F2
FCx B

FAy

A FAx

(h) (h1) (h2)

FCx
A

FAy


FCy
C

FOy

FAx


FC′y A FE F

C D

FOx
O
FC′x E
B

(i) (i1) (i2)

A
FA′x

A
C

FOy

O


E

FOx

F

D

FBy

B FBx
FA′y
FE′

FBx


FBy

B

(i3) (i4)

FAy

A
F
Ax
FBy

B
D E C
H

P
FBx


FBy

B


FCx


FBx


C

FCy

(j) (j1) (j2)

D FT 2

FT′2 E


FAx
FAy
FD′y
FE′y
C FC′x


FE′x

FT1


FDy
FDx
FEx


FEy

FT 3
A D FD′x
E

FC′y

(j3) (j4) (j5)

E

F FB
C E
D F ′ B
θ

FC′y

FD′E

(k) (k1)

F FB
C
B
θ E

F

FCx
C

FCy

D
FAy
A


FAx
90° − θ
FDE
D
FAy
A FAx

(k2) (k3)

FB F1

B

A C
FA

FB′

FD

B D

FC

(l) (l1) (l2)
F2

FD′ D

E
FE


F1 F2
D
B

A C E

FA FC FE

(l3) (l4)
或

1
F FB′

FDy


FD′x

1 F2
D

B D FDx D B

C E

FC FEy
FEx
A C

FA FC
E

FEy
FEx

(l2)’ (l3)’ (l4)’

FA′D
A


FCy

C


FCx

F1

B

(m) (m1)

FAD
D E

FE


H F2

FH


FAD

A


D
FA′D

(m2) (m3)

Fk

FOy

O
A

FOx
FN A


FN B

B

(n) (n1)

FN1

B D q

FB′

FN 2

(n2)


FN 3

F
B D F

F
FC FE
A G
A C E FG

(o) (o1)

B B D
FB
F F
F
D F
F ′ FE

A FA
FB′ C C D
D E FF

(o2) (o3) (o4)

图 1-2