1. The problem statement, all variables and given/known data A mass of 5kg and wedge of 10kg are held at rest. All surfaces are frictionless. No outside forces are acting on the system. θ of the wedge is 30°. Once the block and wedge are let go, what happens to both objects? What is the acceleration of the block left/right and what is the acceleration of the block down the wedge? 2. Relevant equations I seriously do not get this problem at all. 3. The attempt at a solution When I made a fbd, and split both masses into x and y components, it showed that the wedge will accelerate in the opposite direction of the block's acceleration. Anyone understand this?