1. The problem statement, all variables and given/known data An inclined plane, fixed to the inside of an elevator, makes a 32 degrees angle with the floor. A mass m slides on the plane without friction. What is its acceleration relative to the plane if the elevator accelerates upward at 0.50g? 2. Relevant equations F = ma 3. The attempt at a solution The free body diagram I have drawn involves FN and mg. I made the relationship between these two like this: FNcos32 - mg = 0.5mg (upward acceleration) FNsin32 = m*ax I've found that ax is 1.5g(tan32). There is also the acceleration of elevator. But, because we are looking with respect to plane, we don't take it into consideration, do we? I know that I can simply get the acceleration parallel to the plane just by adding the elevator's acceleration to gravity and multiplying it with sin32. Our teacher, however, doesn't want us to do these problems like that. So I am asking for help about my solution.