1. The problem statement, all variables and given/known data A suspended 2.87 kg mass is moving up, a 1.5 kg mass slides down the ramp, a suspended 8.4 kg mass on the left is moving down. There is friction between the block and the ramp. The acceleration of gravity is 9.8 m/s2 . The pulleys are massless and frictionless. Find the acceleration of the 3 block system. Here is a diagram http://img8.yfrog.com/i/capturexki.jpg/ [Broken] 2. Relevant equations F=ma Friction=μN F parallel: mgsinφ F perpendicular: mgcosineφ 3. The attempt at a solution Sumation equation I set up (mass 1= 8.4kg, mass 2=1.5kg, mass 3=2.87kg mt=total mass) m1g-m2g(sinφ)-friction-m3g=mtg after the numbers are plugged in: (8.4)(9.8)-(1.5)(9.8)sin36-(0.14)(1.5)(9.8)cos36-2.87(9.8)=12.77a acceleration would equal=3.43 m/s2 is this correct?