CE 2450 Chapter : Lesson 3
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2. 4 addition of a system of coplanar forces. Rectangular components components of a force along the x and y axes. F = fx + fy. Fy is negative because the component is directed along the negative y- axis. When forces are shown graphically, the head of the arrow indicates the sense. Negative signs are not used. A: a unit vector along an axis denotes the positive direction of an axis. Unit vectors along the x, y and z axes respectively i, j, k. I , j , k. F = fx i + fyj. Example: problem 2- 42 part 1. Write fa and fb as cartesian vectors if fb = 600 n and = 20 . Coplanar forces are forces that all exist in the same plane. To determine the resultant of several coplanar forces: write each force in cartesian vector notation. F1 = f1xi + f1yj. F2 = - f2xi + f2yj.
