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EXAMPLE 1
a) Represent a force of 30N in a direction
300 north to east.
b) Represent a force of 20N in a direction 450 east to north.
Solution
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EXAMPLE 2
In a plane, add a 150 N force at 300 and -50 N force at
900 using the (a) parallelogram Law (b) the triangle law.
Solution
(a) By the Law of Parallelogram
The resultant of  +  is  . measures to the chosen scale 141 N with inclination
qx = 80 or 3680
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(b) By the Law of triangle of vector addition
The resultant of + is with || = 135 N and
qx = 10.890
EXAMPLE 3
In a plane, subtract 200 N, - 3000 from 170 N, 450
Solution
To the 170 N, 450 Force add the negative of 200 N, -
3000 obtaining a resultant force of
380 N and qx = 600. All angles are measured with respect to the x-axis.
= +
= 380 N and qx = 600
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