1. The problem statement, all variables and given/known data A block of mass 2.1 kg is placed on a frictionless inclined ramp of mass 20.0 kg, with the angle θ= 31o as shown below. http://s4.lite.msu.edu/res/msu/physicslib/msuphysicslib/09_Force_and_Motion/graphics/prob91_plane2.gif Calculate the size of the net horizontal force that must be applied to the ramp to prevent the block from accelerating with respect to the ramp? 2. Relevant equations mgsin(theta) = F of the small block 3. The attempt at a solution i've used the data to find the acceleration of the small block (5.0474). but i'm not sure where to go from there. i've tried multiplying by the mass of both block and that didn't work. anyone want to help?