1. The problem statement, all variables and given/known data "Forces of 10.6 N north, 19.1 N east, and 16.0 N south are simultaneously applied to a 3.62 kg mass as it rests on an air table. What's the direction of acceleration in degrees (Take east to be 0 degrees and counterclockwise to be positive.) " Using components, I already figured out the magnitude of acceleration. a=5.48m/s/s Fnet=19.8N --> broken into components: F(x)=19.1N, F(y)=-5.4N 2. Relevant equations Fnet=ma Trig ratios for sin and cos 3. The attempt at a solution Using components, I figured out the total force in the x and y directions, and then used the pythagorean theorem to calculate the Fnet. To find acceleration, I then isolated for a = Fnet/m = 5.48m/s/s However, I'm having a lot of trouble figuring out the direction of the acceleration, and I don't know why! It's simple trig ratios. cos(thetha) = F(x)/Fnet = 19.1/19.8 (theta) = 15.3 degrees Its positive because the counterclockwise direction is positive. Am I doing it wrong because they are asking for the direction of accleration, and I'm using the direction of Fnet? I don't see how I can use acceleration in the trig ratios though, since acceleration is only in the direction of Fnet... not the components on the x and y axis.