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Problem 2.45
[Difficulty: 2]
Given:
Block pulled up incline on oil layer
Find:
Force required to pull the block
f
θ
N
x
x
U
y
d
W
Solution:
Governing equations:
τ
yx
μ
du
dy
⋅
=
Σ
F
x
Ma
x
⋅
=
Assumptions:
Laminar flow
The given data is
W
10 lbf
⋅
=
U2
ft
s
⋅
=
w1
0
i
n
⋅
=
d
0.001 in
⋅
=
θ
25 deg
⋅
=
μ
3.7
10
2
−
×
Ns
⋅
m
2
⋅
=
Fig. A.2 @100
o
F (38
o
C)
Equation of motion
Σ
F
x
x
⋅
=
0
=
s
o
Ff
−
W sin
θ
()
⋅
−
0
=
The friction force is
f
τ
yx
A
⋅
=
μ
du
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This note was uploaded on 10/19/2011 for the course EGN 3353C taught by Professor Lear during the Fall '07 term at University of Florida.
 Fall '07
 Lear
 Fluid Mechanics

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