1. The problem statement, all variables and given/known data Three forces act on a moving object. One force has a magnitude of 80.0 N and is directed due north. Another force has a magnitude of 60.0 N and is directed due west. What must be the magnitude and direction of the third force, such that the object continues to move with a constant velocity? Force 1 = 80.0 N due north. Force 2 = 60.0 N due west. 2. Relevant equations a^2 + b^2 = c^2 Theta = tan^-1(fy/fx) 3. The attempt at a solution First I started by plotting the problem on a cartesian plane. I then took my known quantities of 80.0 N due north (along the positive y axis) and 60.0 N due west (along the negative x axis) and used pythag to find the net force, the answer of which was 100 N. I then attempted to find the direction using Theta = tan^-1(fy/fx) = tan^-1(80/60) = 53.13. My question is, am I right in assuming that I must counteract the first two forces with the third to ensure a constant velocity? If so I would appreciate any help in this regard.