An elliptical exerciser machine (see figure part a) is composed of front and back rails. A simplified plane-frame model of the back rail is shown in figure part b. Analyze the plane-frame model to find reaction forces at supports A, B, and C for the position and applied loads given in figure part b. Note that there are axial and moment releases at the base of member 2 so that member 2 can lengthen and shorten as the roller support at B moves along the 308 inclines.

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10 Pin support (joint 3) at pivot point Back rail Roller support (joint 1) for back rail 20 lb 175 lb 25 lb Front rail Axial & moment releases at hinge above joint 2 20 lb Axial release -Incline at 30° Moment release (or hinge)