Capitulo sobre atrito o qual estabelece um criterio sobre como na fisica isto tem relevancia academica cronica e estática movida a gás.

1. ! !
! " # $ % !
& ! # ' ' ! ( #
)
*
! +% ,
! # - . ! /
/ . ! ($ +% ,
! # # ) #
% # ! ( # ! ( 0 .
# # '
% 0
0 ! ( # 1
"
Fm
Fc

2. µ=
µ !
2 ! -
!
3 µ
. 4 56 4
. 4 7 4
8 ) . . $ 4 4 9
* . 4 : 5
0 ! ( ! ,
µ=
µ !
(;
! ,
5 ! ( $ '
: ! ( ' # $ $ !
% '

3. <
7 ! ( '
= 2 ' ' :> " ?
∆ = @ A
)
8
B )
) <4 CD E
( # 2
! 8 4 6
(; )
54 CD E
B '

4. 9
)
8
0
0
" "
F
+ +
" ,6 / 7 (;
'
B '
)
0
"
F
+
8
G8%
G8H
8
0
"
+
G8%
G8H
" , /
(; '
I .
F / 5, ' '
)
µ."
"
F
+
8
G8%
G8H
8
0
"
+
G8%
G8H
I (; ,

5. <4
46 4
4
46 = 4 : : 4 5 4C J E C K C J EE
+ =
− − + =
× − × + × − + × =
− − =
− − =
− × + × − × =
4
4
= 4 : 5 4C J E
I ($ I ,
[ ]
[ ]
[ ]
=
= −
=
=99=
:=9
7<76
#
#
#
[ ]
[ ]
[ ]
=
=
=
77<6
:=9
=<5
#
#
I 0 ' % # . '
+ $ ' ' ! :>) /
F / :, ' '
)
"
F
+
8
G8%
G8H
8
µ "
"
+
G8%
G8H
0
I (; ,

6. <5
+ =
− − + =
× − × + × − + × =
4
4
= 4 : : 4 5 4C J E C K C J EE
− − =
− − =
− × + × − × =
4 6 4
4
4 6 = 4 : 5 4
#
# C J E
I ($ I ,
[ ]
[ ]
[ ]
=
=
= −
5<75
5= <
5<75
#
#
#
[ ]
[ ]
[ ]
=
=
=
: 7
: <5
7 :
#
#
#
I 0 ' % # . '
+ ($ !
!
2 /'
. 6 I !
. ! 4 :6#
L
B - /
2 . 5: D . 8 D $
. I . !
!
4 5:# ' ! ( .

7. <:
( )
( )−
=
−
=
⇔
=−−
=−
⇔=
::
:5
5:
5:
5
5
4
4
4
µ
µ
µ
µ
µ
" #
2.M ' ,
5 0 ' ($ # % # !(
!
: . # !
Q
P B ' &
' . )
# !
G ($ ,
0 - ' . (; .
P
N1
µµµµ N1
µµµµ N2
N2
P
N1
µµµµ N1
µµµµ N2
N2
0 - ' ) (; .
$ µµµµ N2
N2
µµµµ N3 N3
θ
$ µµµµ N2
N2
µµµµ N3 N3
$ µµµµ N2
N2
µµµµ N3 N3
θ
( ) ( )
( ) ( )
⇔
=−−
=−−−
⇔=
4
4
4
:77
7:7
θµθ
θµθµ

8. <7
( )( ) ( )
( ) ( ) ( )( )−−
+−
=⇔
θµθµ
θµµθ
:
:
5
:5
($ . 8
M ' ) > !
!
4 76# ! ( &
E ' .
.E 8 % .
% &
N -($ #
! . ) - #
! 2 ) ! ) -
' (
Q
H
P
P
L
2π2π2π2πr
N
µµµµN
F ! & . ! # & '
% ' F
(; . $ . % ; ! ( & #
'

9. <=
( ) ( )( )
( ) ( )( )
= =
+
−
K
µ
µ
Θ Θ
Θ Θ
( ) ( )( )
( ) ( )( )
= =
−
+
K
µ
µ
Θ Θ
Θ Θ