**6.1 Center of gravity**

The center of gravity (CG) is the focal point of a body's weight appropriation, where the force of gravity can be considered to act. It is the point in any object about which it is in perfect balance regardless of how it is turned or pivoted around that point. For a limited arrangement of point masses, CG might be characterized as the normal of positions weighted by mass. For its figuring a few parameters were viewed as, for example, the thickness of the material, the volume of the piece and the good ways from the origin arrange around the focal point of the piece. This is critical for the stability of the wheel chair. Thus considering x, y and z axis the center of gravity of the point masses will be given, and to find the center of gravity of composite bodies this was considered in the detailed design.
