Problem $1$: Skill$/$concept$.$ Solving for forces within a frame$/$machine$.$ Solving for internal forces at a point. The crane supports a load of $750$ lb from the trolley which rides on the top of the horizontal beam. Determine the internal normal force, shear force, and moment in the beam at point C when the trolley is at the position shown. The crane members are pinned together at B$,$ E and F and supported by a short link BH$.$