When a node is fixed to a roller, it is permitted to move only along a straight line the direction of the roller. Consider the three-bar structure in Example 6.5. Suppose node 1 is fixed, but node 4 is attached to a roller that permits it to move only in the horizontal direction. (a) Construct the reduced incidence matrix and the equilibrium equations in this situation. You should have a system of 5 equations in 5 unknowns - the horizontal and vertical displacements of nodes 2 and 3 and the horizontal displacement of node 4 . (b) Is your structure stable? If not, how many rigid motions and how many mechanisms does it permit?