Question

Three forces have the following components, all in Newton’s: (Fx = -5, Fy = -7), (Fx = 0, Fy = 30),
(Fx 20, Fy = -16). Find their resultant.

Answer 1

The resultant can be found by Pythagorean theorem:

$$F_R=\sqrt{F_{xR}^2+F_{yR}^2}=\\ =\sqrt{(-5+0+20)^2+(-7+30-16)^2}=16.6\text{ N}.$$