Circular has its origin in the Latin word circularis and allows to name that belonging to or relative to the circle. As an adjective, it is used to refer to any object that has a rounded shape, even those that are not perfectly circular, since it mainly serves to refer to the lack of corners or angles.
The process that seems to have no end because it ends at the same point in which it begins is also known as circular: “It is a circular conflict, we are always returning to the same causes”, “The writer surprised with a circular story that leaves many open doors ”, “ This circular story has me fed up ”.
The verb circular also makes mention of walking or moving around, coming and going or passing from one place to another: “The police ask pedestrians not to stop circulating so that the rescue teams can arrive more quickly”, “ The news soon circulated among the main leaders of the party ”.
A circular, on the other hand, is an order that an authority directs to his group (circle) of subordinates. The concept is also used to refer to letters or notices addressed to a group of people or to the community in general to give knowledge of something: “The company published a circular where it denounces government pressure”, “I have just received a circular of a political movement that promotes taking the power to demand building improvements “, ” Juan is writing a circular that we will have to distribute throughout the neighborhood so that all people know what is happening with the hospital funds. “
This last meaning is widely used in the area of neighborhood communities, as a tool that presidents take advantage of to inform all owners and tenants about various proposals and measures that they plan to implement to improve coexistence or to solve specific problems, among others. possibilities. It is the responsibility of each person to read the circulars carefully, to be aware of the issues related to their building and in this way to be able to participate in community decisions.
A circular or circumferential motion is known as one that is based on an axis of rotation and a constant radius, so that its trajectory draws an imaginary circumference. When it is the particular case that its rotational speed is also constant, a uniform circular motion takes place.
Let’s look at some of the concepts on which dynamics and kinematics are based to describe a circular motion:
* Axis of rotation: it is a straight line that serves as the center of rotation. It should be noted that it does not always remain fixed, but for each particular moment it represents the axis of rotary motion. The point you define in relation to the path you want to analyze is called the center of rotation;
* Arc: it is the space that is covered in the trajectory or the arc of unit radius used to measure the angular displacement, taking as the starting point the axis of fixed rotation. It is expressed in radians;
* Angular velocity: the magnitude by which the angular displacement varies for each unit of time (it is represented by the letter omega in lowercase);
* Angular acceleration: the amount by which the angular velocity varies for each unit of time (it is represented by the letter alpha in lower case).
There are, in addition, three highly relevant magnitudes:
* Angular momentum: is equivalent to the amount of movement or the time linear concepts belonging to the rectilinear motion;
* Moment of inertia: a quality dependent on the distribution of mass and the shape of bodies;
* Moment of force: also known as motor torque, it is the application of force by the distance from the axis of rotation.