How do i workout the resultant force and direction?

1. Nov 20, 2004

Gughanath

The angle between a 40N Force and a 70N is 60 degrees....how do i workout the resultant force and direction?

2. Nov 20, 2004

vsage

Take the 70N force to lie on the polar axis (+x axis). The vector component of this force is then 70N <cos(0), sin(0)> while the 40N force is given by 40N<cos(60), sin(60)>. Sum the i and j components of these vectors and that's the resultant force. The direction is given by tan^-1(j component / i component)