Where is the center of gravity of the human body

In daily life, especially when riding two-wheeled vehicles such as bicycles and motorcycles, the most important thing is to find the right center of gravity and maintain a balanced position to avoid falling during riding. In fact, the body's sense of balance is related to the position of the center of gravity. Fat people have a lower center of gravity, while thin people have a higher center of gravity. Let's take a look at where the center of gravity of the human body is.

I. Definition

The point where the resultant force of gravity on all parts of an object acts. Every tiny part of an object is affected by the gravity of the earth, and these gravitational forces can be approximately regarded as a system of intersecting forces at the center of the earth. Since the size of an object is much smaller than the 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 remain unchanged, then no matter what direction the object is in relative to the ground, the gravity it experiences will always pass through a fixed point in the coordinate system fixed on the object, namely the center of gravity. The center of gravity is not necessarily on an object. For example, the center of gravity of a ring is not on the ring, but on its center of symmetry.

2. Location Determination

The position of the center of gravity of an object. For an object with uniformly distributed mass (uniform object), the position of the center of gravity only depends on the shape of the object. For objects with regular shapes, their center of gravity is at the geometric center. For example, the center of gravity of a uniform thin straight rod is at the midpoint of the rod, the center of gravity of a uniform sphere is at the center of the sphere, and the center of gravity of a uniform cylinder is at the midpoint of the axis. The center of gravity of an irregular object can be determined by the suspension method. The center of gravity of an object is not necessarily on the object.

For objects with uneven mass distribution, the position of the center of gravity is not only related to the shape of the object, but also to the distribution of mass within the object. The center of gravity of a truck changes with the amount of cargo loaded and the loading position, and the center of gravity of a crane changes with the weight and height of the lifted object. If a straight line or section passing through the center of gravity divides an object or figure into two parts, the volumes or areas of the two parts are not necessarily equal.