1. The problem statement, all variables and given/known data The surfaces between a 11 kg block, the 16 kg wedge and between the 16 kg wedge and the horizontal plane are smooth (without friction). The acceleration of gravity is 9.8 m/s2 . A block is released on the inclined plane (top side of the wedge). What is the force F which must be exerted on the 16 kg block in order that the 11 kg block does not move up or down the plane? Answer in units of N. 2. Relevant equations F=ma 3. The attempt at a solution I drew a free body diagram with the i axis horizontal and the j axis vertical for each object, the block and the ramp. The block has a force of gravity, in the negative j direction and a normal force in the positive j direction. The acceleration of the block is 0. I'm not sure how to figure out the exact free body for the ramp, since it's angled, or how to find what the force should be. Thanks for the help!