1. Three bars each has weight W. They are pinned together at the corners to form an equilateral triangle suspended from the ceiling at point A. So points B and C (the other two vertices) lie on a horizontal line. I need to draw a diagram of each bar separately, showing all the forces acting on each one, and calculate the compressive force in BC I don't see why there would be a compressive force in BC, because any force would be horizontal, and the only acting forces are the weights, which are vertical, so have no horizontal component. Help! With regards to forces acting on each bar, they all have their weight, which acts half way along its length and downwards. Will the force exerted on both AB and AC (the force at A) from the ceiling be purely vertical and be equal to 3W? At the other two joins, what are the reactions or tension effects? Thanks.