1. The problem statement, all variables and given/known data (a) A box is placed on an frictionless inclined plane with an angle of 18° from the horizontal. The box has a mass of 35 kg, what is the magnitude of the acceleration of the box along the inclined plane? (b) What magnitude of force would you need to apply to the box in order to keep it at rest? Assume there is no friction and the force applied is parallel to the ground. 2. Relevant equations F=ma=W F=mgsin 3. The attempt at a solution using a combination of the two equations I got that the answer for the first part was 3.03 m/s2 (which was right), but I'm still rather confused about the second part. Do I have to set a=0, because that would mean that F would have to be zero (which wouldn't make sense....and isn't right either). I guess I mainly need help in setting this problem up and the reasoning behind it.