Q15 of 43 Page 85

The resultant of two forces at the right angle is 5N. When the angle between them is 120°, the resultant is , then find the magnitudes of two forces.

If the forces and act on a point, then the resultant force F is given as:


Where Ɵ = Angle between and


Now, given that at Ɵ = 90°, F = 5 N


So,




…1


Given when Ɵ = 120°, then F = 13 N


So,



..2


Solving 1 and 2, we get:


,



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