# center of gravity

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## center of gravity:

see center of masscenter of mass,
the point at which all the mass of a body may be considered to be concentrated in analyzing its motion. The center of mass of a sphere of uniform density coincides with the center of the sphere.
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## Center of gravity

A fixed point in a material body through which the resultant force of gravitational attraction acts. The resultant of all forces or attractions produced by the Earth's gravity on a body constitutes its weight. This weight is considered to be concentrated at the center of gravity in mechanical studies of a rigid body. The location of the center of gravity for a body remains fixed in relation to the body regardless of the orientation of the body. If supported at its center of gravity, a body would remain balanced in its initial position. See Gravity, Resultant of forces

## center of gravity

The point in a material body at which a single force, which is the resultant of all external forces on the body, may be considered to act. The center of gravity of a body in a uniform gravitational field coincides with the body's center of mass. A body does not possess a center of gravity, however, if the external forces are not equivalent to a single resultant force or if the resultant does not always act on the same point of the system. This situation occurs in a nonuniform gravitational field. The Moon has strictly no center of gravity although the resultant force of the Earth's gravitational attraction always passes within a few meters of the center of mass.

## Center of Gravity

the geometric point through which the resultant of all gravitational forces acting on the particles of a body passes. The location of a body’s center of gravity is fixed relative to the body regardless of the body’s position in space.

It is possible for a body’s center of gravity not to coincide with any of the points of the body; a ring is an example of such a body. If a free body is suspended by a thread attached successively to different points of the body, the various directions of the thread will intersect at the body’s center of gravity. In a uniform gravitational field a body’s center of gravity coincides with its center of mass.

Suppose a body is divided into parts. If the weight pk of each part and the coordinates xk, yk, zk of each part’s center of gravity are known, then the coordinates of the center of gravity of the body as a whole can be found from the equations

In the case of a homogeneous body that has a center of symmetry—for example, a sphere, a cylinder, or a rectangular or round plate—the center of gravity is located at the center of symmetry.

## center of gravity

[′sen·tər əv ′grav·əd·ē]
(mechanics)
A fixed point in a material body through which the resultant force of gravitational attraction acts.

## center of gravity, center of mass

A point within a body such that, if the whole mass of the body were concentrated there, the attraction of gravity would remain the same.
References in periodicals archive ?
Nevertheless, the adversarial element in the concept of centers of gravity is largely missing in Howard and Paret.
Throughout history, many would-be conquerors have failed to succeed largely because they did not fully appreciate moral centers of gravity.
These selections are the respective centers of gravity.
Exploitation of these vulnerabilities could significantly damage ISIL's centers of gravity.
Air Force, which takes a "targeting" approach to warfare, sees centers of gravity as multiple strategic and operational critical points that it can attack with its bombing assets.
6) The Joint Staff now defines centers of gravity as those "characteristics, capabilities, or locations from which a military force derives its freedom of action, physical strength, or will to fight.
4) These sources of power where the enemy derives its strength are commonly referred to as centers of gravity.
5) Joint doctrine also specifies that centers of gravity may be found at all three levels of war (strategic, operational, and tactical) and that they should be nested, meaning the destruction of an operational-level center of gravity should have a major impact on the strategic center of gravity.
3 emphasizes using a holistic view of the operational environment to identify centers of gravity in a system.
Any discussions of centers of gravity at this point are premature.
Similar to the approach adopted by the Marine Corps, centers of gravity and critical vulnerabilities are regarded as different but complementary ideas.
It seems to rely on an approach developed by Joseph Strange, who concluded that service definitions lacked precision and tended to equate centers of gravity with physical ruinerabilities or strengths without enough attention to psychological centers of power.

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