Hello everyone! 1. The problem statement, all variables and given/known data A weightless, friction-less pulley and rope system connect two blocks, called A and B. A has a mass of 2.2 kg, and B has a mass 4.0 kg. Both blocks are on a scalene triangle, with the pulley located at the triangle's apex. Block A is on an incline of 51 degrees, and block b is on an incline 21 degrees. The coefficient of kinetic friction between each block and the surface is 0.30. Here is the visual of the problem: http://i.imgur.com/k8YSshe.jpg Now, so far, so good. Here is where things get tricky: If mA moves up, and mB moves down, determine their acceleration. 2. Relevant equations Force (friction) = coefficient of friction * Normal force ƩF = ma 3. The attempt at a solution I assigned the conventional "tilted" x-y axis, with the x axis being parallel to the incline under block B. X-direction for block B: mass*g*sin21' - co of fr*cos21'*mass*g = 14.048 - 10.979 = 3.069 X-direction for block A: (all negative because going against movement, as defined in the problem)(also equal to tension) -(mass*g*sin51') - co of fr*cos51'*mass*g = -16.755 -4.07 = -20.825 Which can't possibly be correct. To be honest, I've never done a problem with two different inclines like this before, but the numbers just seem off to me. I have absolutely no idea what to do from here, which means I'm probably grievously wrong somehow. This problem has made me so confused. Thank you for even considering helping me!