1. The problem statement, all variables and given/known data The surfaces between a 9 kg block, the 15 kg wedge and between the 15 kg wedge and the horizontal plane are smooth (without friction). The acceleration of gravity is 9.8 m/s. A block is released on the inclined plane (top side of the wedge). What is the force F which must be exerted on the 15 kg block in order that the 9 kg block does not move up or down the plane? Answer in units of N 2. Relevant equations ƩF = ma 3. The attempt at a solution I know that when you push something with an object on it with a force in a direction, the object will try to oppose that direction. I don't really know how to break it into vectors though.