A force F of magnitude 12 N, Please help!! A force F of magnitude 12 N has componenets P and Q. The sum of the magnitudes of P and Q is 18 N. The direction of Q is at right angles to F. Find the magnitude of Q. I am not able to visualize the drawing. My question is this. I know the sum of two vectors is a third vector. So in the problem, it seems F is the third vector with a magnitude of 12 N. Then how can sum of P + Q = 18N. I am confused. Please help.