1. The problem statement, all variables and given/known data How to know when one is suppose to add or subtract to get the normal force of an object. 2. Relevant equations FN = Fg, FN = F sin(-) 3. The attempt at a solution I believe to get the normal force of a 2 kg object when it is being pulled upwards by a force of 45 Newtons at an angle of 40 degrees is: FN = 45 N sin(40) - 19.6 N FN = 9.32 N or is it: FN = 45 N sin(40) FN = 28.9 N Which one is correct? How do I know when to add or subject the normal force and gravitational force?