El Gravity center It is the point of tension of the resultant of all the forces of gravity acting on the different material fractions of a body, such that the moment with respect to any point of this effect applied at the Center of Gravity is the same as that derived from the weights of all the material masses that make up said body. If you want to know more about the force of gravity, you can consult the information at what is the force of gravity.
In other words, the center of gravity of a body is the point with respect to which the forces that gravity exerts on the different material points that make up the body originate a null moment.
In this sense, the Center of Gravity of a body does not necessarily pertain to a material point of the body. Thus, the center of gravity of a hollow sphere it is located in the center of the sphere, which does not concern the body.
Location of the Center of Gravity in the Human Body
In the human body in its static state, according to the scientist Miralles (2007) it is found in front of the lumbar vertebra L5. But according to the study and findings of other authors, it is located in the anterior part of the S2 Sacral Vertebra, and each body fragment has its Centro Serious.
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Differences Between Weight and Mass
These terms have always been a source of confusion since they tend to be confused or give the same concept to both, and yet they are not.
Mass
The mass is the amount of matter in a body, is a dimension. And therefore, it is a scalar unit, represented by Tons (Tn), Kilograms (Kg) and Milligrams (mg).
Weight
The weight is considered as a force, which is represented as a vector since it has dimension, direction and sense. It is also represented under exclamation de Newton (N = Kg.m/s²), that is, weight is equal to mass times gravity (9,8m/s²) and its formula is P= mg If you want to expand your knowledge, you can find out about what Newton discovered about gravity.
For example, if there is a person with a mass of 80Kg.
Then it has the following proportions: a mass of 80Kg, obtains a weight of 784Newtons.
Center of Mass and Center of Gravity
El center of mass It agrees with the center of gravity when the body is in a similar gravitational field. That is, when the gravitational field is of a firm dimension and direction throughout the body's extension. To better understand how gravity works, you can read about the relationship between gravity and magnetism.
For practical purposes, this coincidence is fulfilled with acceptable accuracy for almost all the bodies that are on the ground plane, even for a machine or a large building, since the decrease in gravitational intensity is very small throughout the extension of these bodies.
Geometric Center And Center Of Mass
El geometric center of a material body agrees with the center of mass if the body is homogeneous (similar density) or when the placement of matter in the system has certain properties, such as proportion.
Center Of Gravity Assets
The resultant of all gravitational forces acting on the particles that make up a body can be replaced by a single force, that is, the body's own weight, used at the body's center of gravity. This means that the effects of all the own gravitational forces (on the particles) can be compensated by a single force, provided that it is used at the center of gravity of the organism. You can delve deeper into how gravity acts on the center of the Earth.
In this sense, an object resting on a flat seat will be in firm balance if the vertical passing through the Center of Gravity intersects the base of support.
At the same time, if the body moves slightly away from the balance position, a renovating moment will arise and it will recover the position of original balance. However, if it moves further away from the equilibrium position, the Center of Gravity can fall outside the base of support and, in these situations, there will be no renewing moment and the body conclusively leaves the initial equilibrium position through a turn that It will transport you to a new perspective of balance.
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Line Of Gravity And Posture
La gravity line symbolizes a fictitious vertical line that crosses the Center of Gravity. The line of gravity is the influence of the Center of Gravity and depends on its position. This is generally handled in the assessment of posture, since different physical points of reference are found along its path.
On the other hand, the posture lies in the placement of the body mass in relation to gravity on a base of support or lift. On the other hand, the posture is the set of places that all the joints of the body adopt in an explicit moment.
Also, in the ideal two-foot stance the result of the interaction of many forces external, such as gravity, the reaction of the floor and inertia, in addition to those internal sections such as muscle activity, capsular tension, joint tension, fascial ligament tension, tendon tension, among others, that occur and are formed in the human body to maintain a stable and aligned posture.
Movements of the Center of Gravity while the body is in motion
The Center of Gravity can vary in the location of other individuals since it depends on the structure of each person, that is, their anatomy, during the phases of human walking the Center of Gravity tolerates sliding up and down, forward and backward and side.
That is to say, in all the planes what is going to answer that the vertical projection of it always falls on the base, these movements They directly affect a person's energy consumption and, if disturbed, affect walking efficiency. If you're interested, you can read more about how gravity influences the Earth.
There are various components of displacement control of the Center of Gravity in the Human body when marching, which affirm that said displacement is not greater than 5 cm and were narrated by Saunders, Inman and Eberhart.
4 Ways to Keep in Mind When Lifting Loads
When lifting a load, the location of the Center of Gravity of the Object that we are carrying with respect to the Movement Center of the spine since moments of force are going to be formed that may or may not cause an injury. Likewise, several factors will establish the loads on the spine during these actions, among them we have:
1. La posición of the Object in correspondence to the center of inclination of the spine.
2. The size, the shape, the weight and the density of the object.
3. The degree of flexion or twisting of the spine.
4. The type of Tax.
It is important to note that keeping an object close to the body compresses the moment of current on the spine, because the distance from the Center of Gravity of the object to the center of movement of the spine, which is actually the tourniquet arm, is subjugated.
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That is, the shorter this turnstile arm is, the lower the magnitude of the created moment and therefore less will be the load taken by the lumbar spine, therefore the closer to the body is the Center of Gravity of an object, the less will be the load that falls on the lumbar spine.
