1. The problem statement, all variables and given/known data http://imageshack.us/a/img594/4821/fileeq.jpg [Broken] So, the problem is to find the minimum acceleration required to keep the block on the ramp, when the ramp is being pushed at an angle to the horizontal (so going diagonally) I know that the coefficient of static friction is 0.4 and gravity is 10.0m/s/s 2. Relevant equations I think these are what i need to use: Fnet = ma FfStatic = uFn And maybe need w = mg? 3. The attempt at a solution Well, honestly i have no idea what to do, the final answer is 3.84, but i don't get how to get it. I tried to do something like this: Fn = 10*sin(30)/0.4 = 12.5, and then the friction force is 0.4*12.5 = 5.0, but no idea what that means. Any help?