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If every element in the structure is regarded as an object, there must be a balance point (i.e. the center of gravity) under the action of these objects, and the position of this balance point determines the physical balance of the structure.
The center of gravity refers to the point where the earth exerts a resultant force on every tiny part of an object. Every tiny part of an object is affected by gravity (see gravity), which can be approximately regarded as a system of forces intersecting the earth's center.
Because the size of an object is much smaller than that of radius of the earth, the gravitational force acting on a general object can be approximately regarded as a parallel force system, and the total weight of the object is the resultant force of these gravitational forces?
Every tiny part of an object is affected by gravity (see gravity), which can be approximately regarded as a system of forces intersecting the earth's center. Because the size of an object is much smaller than that of radius of the earth, the gravitational force acting on a general object can be approximately regarded as a parallel force system, and the total weight of the object is the resultant force of these gravitational forces.
If the volume and shape of an object are unchanged, then no matter which direction the object faces the ground, its gravity always passes through a certain point in the coordinate system fixed on the object, that is, the center of gravity. The center of gravity is not necessarily on the object, for example, the center of gravity of a ring is not on the ring, but on its symmetrical center.
The position of the center of gravity is of great significance in engineering. For example, in order for a crane to work normally, the position of its center of gravity must meet certain conditions, and the buoyancy stability of a ship is also related to the position of its center of gravity; High-speed rotating machinery, if the center of gravity is not on the axis, will cause severe vibration.