Learn about the centre of gravity for your IGCSE Physics exam. This revision note includes how the centre of gravity affects the stability of objects. Learn what is the centre of gravity, a theoretical point where the weight of an object is concentrated. Find out how to calculate it for symmetrical and asymmetrical bodies, and how it differs from the centre of mass. Center of gravity, in physics, an imaginary point in a body of matter where, for convenience in certain calculations, the total weight of the body may be thought to be concentrated. In a uniform gravitational field, the center of gravity is identical to the center of mass. The center of gravity of a body is a point where the weight of the body acts and the total gravitational torque on the body is zero.