[SOLVED] Fictitious force and accelerating airplane 1. The problem statement, all variables and given/known data The question asks me to draw a free body diagram for a person standing in an accelerating airplane, and to indicate the fictitious force and any real forces acting on them. The airplane accelerates at 2.22 m/s^2. 3. The attempt at a solution If the airplane accelerates to the right, I know that the fictitious force (ma) will point horizontally to the left. I know that two other forces will be acting, the normal and weight forces, and that one of them ought to act at an angle. We've been taught that the normal force always acts perpendicularly to a surface, and that the weight force always acts straight downward, so I'm not sure with one will act at an angle and why. Any help is appreciated.