Even in ancient times, when simple mechanisms were used (block, lever, gate, etc.), an excellent feature of these machines was found. It turned out that all movements in simple mechanisms have a certain connection with the forces that the machine develops. It should be noted that the ratio of the displacements of the 2 ends of a simple mechanism to which the forces are applied is always the inverse relation of the forces that are applied to these ends.
The force that affects the right shoulder of the lever is n times less than the force that acts on the left shoulder. Accordingly, the movement of the right shoulder (s2) is n times greater than the movement of the left shoulder (s1).
Suppose if, in order to maintain the balance of the lever, the magnitude of the force F2 must be n times less than the magnitude of the force F1. In this case, when the lever rotates, the movement s2 of the second end will be n times greater than the movement s1 of its first end. If the block is double, then the same ratio is relevant for it between the forces that are applied to the ropes that are wound on both blocks and hold it in equilibrium, and the movements of the rope ends when the block rotates. Since the importance of this position cannot be overestimated, it was called very beautifully: the "golden rule of mechanics."
Using the notation that was introduced, the golden rule of mechanics can be expressed by this formula:
s1 / s2 = F2 / F1
or s1 * F1 = s2 * F2.
Subsequently, there was a gradual complication of the types of movements and the nature of the machines that were used in mechanics. It so happened that the golden rule of mechanics does not always retain its relevance in a simple form. However, when the types of machines and types of movements became more complex, the golden rule of mechanics became more complicated. So under his influence began to fall more difficult cases. It should be noted that the golden rule of mechanics became the basis for the emergence of various ideas about energy and work. Moreover, this rule is the first, simplest formulation of the law of conservation of energy, which remains relevant for any natural phenomena.
Application of the Golden Rule
This rule retains its relevance only in the case of uniform movement of simple machines (or with small accelerations). For example, when a double block rotates, the ends of the ropes move at distances s1 and s2, which are wound onto blocks of radii r1 and r2 and are also bonded to each other. These distances are proportional to the radii r1 / r2 = s1 / s2.
Thus, in order for the golden rule to be relevant for the double block, the following specific conditions must be observed: F1 / F2 = r2 / r1.
In this case, the balance of forces F1 and F2. Therefore, the machine must either perform uniform movement, or remain at rest. However, in order to start the double block, the balance must be disturbed. To do this, to some force, say, to F1, we must add some force f. The movement that occurs in the body will be accelerated.
National currency
A national currency is a monetary unit issued by a national bank or a state for the purpose of its use on the territory of that state or abroad. It is used both in the world economic exchange, and in other areas that are based on monetary settlements.
Currency sale fee
The issue of introducing a fee from such an activity as selling cash currency by the resonance it causes in any society can only be compared with elections to the highest authority and the beginning of the functioning of the newly elected parliament. Given the large number of different opinions of experts regarding this innovation, the National Bank is obliged to actively conduct informational work among the population of its state. Thus, he will be able to explain to the people certain rules and concepts that will be useful in the future to every member of society.