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Forensic Engineering Fundamentals
book

Forensic Engineering Fundamentals

by Harold Franck, Darren Franck
December 2012
Beginner to intermediate content levelBeginner to intermediate
487 pages
17h
English
CRC Press
Content preview from Forensic Engineering Fundamentals
192 Forensic Engineering Fundamentals
e analysis used to compute the forces in Table 7.1 follows:
A free body diagram of the forces involved if the load is pulled horizontally F
h
, and the
ramp are shown in Figure 7.2.
Summing forces
ΣF
y
= 0
NW= cosθ
ΣF = 0
FfW
h
=+ sinθ
µµ
=→=
f
N
fN
(7.1)
FNWA
hi
=+µ sin
(7.2)
FWAW A
FW
AA
hi
i
hii
=+
=+
µ
µ
cossin
(cos si
n)
(7.3)
Load
A
i
F
h
Figure 7.2 Dolly on a ramp.
Table 7.1 Force Required to Pull a Dolly and Load
Up a Ramp
A
i
μ
s
= 0.05 μ
s
= 0.10 μ
s
= 0.15
F
h
F F
h
F F
h
F
0 12.82 17.27 25.65 32.96 38.47 47.30
2 21.76 29.30 34.58 44.44 47.39 58.26
4 30.67 41.30 43.57 55.86 56.26 69.16
6 39.55 53.25 52.30 67.22 65.05 79.98
8 48.37 65.53 61.07
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Publisher Resources

ISBN: 9781439878392