Biomedical Engineering Reference
In-Depth Information
Fig. 1.9
Addition of
vectors with application
of the law of cosines
F
1
F
1
F
2
F
2
F
1
F
2
180°-
R
F
1
and
F
2
are the magnitudes of the forces
F
1
and
F
2
, respectively, and
θ
is the
angle between the forces
F
1
and
F
2
.
Example 1.1
The figure of Example 1.1 shows a way to exert a force on a leg of a
patient in a traction device. The two tensions have the same magnitude
F
1
¼
weight
W
of the hanging object
¼
45 N. Obtain the net force (vector sum) acting
on the leg:
F
1
R
= 10 N
F
1
