1. The problem statement, all variables and given/known data Assume the ramp and block make the following coefficients of friction: (μs=0.9 μk=0.3) and the 2 kg mass is placed at rest on the ramp and a horizontal force F is also applied. http://img69.imageshack.us/img69/4097/filepq.jpg [Broken] What is the biggest magnitude force F that can be applied and the mass remains stationary? 2. Relevant equations I know that FN = 20cos40 = 15.32N F|| = 20sin40= 12.85N However will I need to subtract any components from Fn and so on? 3. The attempt at a solution No idea what to do, I did the problem without friction and for that F has to be 16.8N, but no idea what to do with friction incorporated into it.