At school at physics lessons we for the first time get acquainted with such concept as the center of gravity. The difficult task, but is well explainable and clear. Not only the young physicist needs to know definition of the center of gravity. And if you faced this task, it is worth resorting to hints and reminders to update the memory.
Instruction
1. Having studied textbooks by physics, mechanics, dictionaries or encyclopedias, you will come across definition of the center of gravity or as on another call the center of masses. In different sciences a little different definitions, but the essence, actually, is not lost. The center of gravity always is in the center of symmetry of a body. For more evident concept "the center of gravity (or on another call the center of masses) is a point that it is permanently connected with a solid body. Passes through it equally effective gravity, acting on a particle of this body at any its situation".
2. If the center of gravity of a solid body is a point, it means has to have the coordinates. For definition it is important to know coordinates on x, y, z, i-that part of a body and the weight which is designated by a letter - p.
3. Let's review an example of a task. Two bodies of various mass of m1 and m2 which different weight forces affect are given (as it is represented in the drawing). Having written down weight formulas: P1 = m1*g, P2 = m2*g; The Centre of gravity is between two masses. And if to suspend all body in t. Oh, there will come the value balance, that is these objects will cease to outweigh each other.
4. Various geometrical figures have physical and mathematical calculations for an occasion of the center of gravity. To everyone the approach and the method. Considering a disk, we specify that the center of gravity is in it, more precisely in a point of intersection of diameters (as shown in the drawing in t. With - a point crossing of diameters). Find the same way the centers of a parallelepiped or uniform sphere.
5. The presented disk and two bodies with a mass of m1 and m2 - homogeneous mass and the correct form. Here it is possible to note that required us the center of gravity is in these objects. However, in bodies with a non-uniform weight and irregular shape the center can is outside a subject. You feel that the task becomes already more difficult.