# Center of mass vs Center of gravity – Difference [Explained]

The main difference between the center of mass and the center of gravity is that the center of mass indicates the position where all mass of the object is assumed to be concentrated while the center of gravity indicates the position where all weight of the object is assumed to be concentrated.

Before we look at the differences, let us first understand them.

Contents:

## Center of mass:

The center of mass is the point where the whole mass of the object is assumed to be concentrated and its position depends on the distribution of matter into the object which never gets affected by the changes in the gravitational field.

The center of mass is located in the object itself or in some cases it is located outside of the object e.g. center of mass of a solid cylinder is located at its center while the center of mass of the hollow cylinder is located outside of the object in the hollow space.

The whole mass of the object is uniformly distributed around the center of mass. If the body is considered to be made up of ‘n’ number of particles then the sum of the moment of all the particles about the center of mass becomes zero.

## Center of gravity:

The Center of gravity is the point at which the whole weight of the object is assumed to be concentrated. The position of the center of gravity depends on the gravitational field acting on the object.

When the gravitational field acts uniformly over the object, then the center of gravity lies at the center of mass of an object.

The non-uniform gravitational field changes the weight distribution of the object and in this case the center of gravity shifts away from the position of the center of mass toward a stronger gravitational field.

## Center of mass vs Center of gravity:

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Pratik is a Graduated Mechanical engineer. He enjoys sharing the engineering knowledge learned by him with people.