1. The problem statement, all variables and given/known data The problem is described and drawn here: https://drive.google.com/file/d/0B-HFS9bOMNAcMjNacXlha0Z6cVk/edit?usp=sharing Edit: The picture seems not to be showing up, so the address is: https://drive.google.com/file/d/0B-HFS9bOMNAcMjNacXlha0Z6cVk/edit?usp=sharing Possibly this clickable link will work: Problem Picture 2. Relevant equations Newton's Laws of Motion, gravitational force is mg, and the redirection of force on an inclined plane. 3. The attempt at a solution In the picture above--basically, I just am not sure how the force of the mass is directed on the plane. I think I get the rest of the important stuff: The acceleration of the system is a, so you can use F = ma since it will only accelerate in the horizontal direction, and each individual object will also have that same acceleration, etc.