Uniform and uneven motion are the most important concepts of kinematics. The main position of this section of physics is that, considering the translational motion of a body, it should be taken into account that all its points move in the same direction with exactly the same speed. That is why it is not necessary to characterize the movement of the entire given body, you can limit yourself to only one of its points.
The main characteristics of any movement are its trajectory, movement and speed. A trajectory is just a line that exists only in the imagination along which a given material point moves in space. The displacement is a vector directed from the start point to the end point. Finally, speed is a general indicator of the movement of a point, which characterizes not only its direction, but also the speed of movement relative to any body taken as a reference point.
Uniform rectilinear motion is a largely imaginary concept characterized by two main factors –uniformity and straightness.
The uniformity of movement means that it is carried out at a constant speed without any acceleration. Straightness of movement implies that it occurs along a straight line, that is, its trajectory is an absolutely straight line.
Based on all of the above, we can conclude that uniform rectilinear motion is a special type of motion, as a result of which the body performs the same movement in absolutely equal time intervals. So, by dividing a certain interval into equal intervals (for example, one second each), it will be possible to see that with the movement indicated above, the body will cover the same distance for each of these segments.
The speed of uniform rectilinear motion is a vector quantity, which in numerical terms is equal to the ratio of the path traveled by the body for a given period of time to the numerical value of this interval. This value does not depend on time in any way, moreover, it is worth noting that the speed of uniform rectilinear motion at any point of the trajectory absolutely coincides with the movement of the body. In this case, the quantitative value of the average speed for an arbitrarily taken period of time is equal to the instantaneous speed.
Uniform rectilinear motion is characterized by a special approach to the path that the body passes in a certain period of time. The distance traveled with this type of movement is notanything but a movement module. The movement, in turn, is the product of the speed with which the body moved by the time during which this movement was carried out.
It is quite natural that if the displacement vector coincides with the positive direction of the abscissa axis, then the projection of the calculated speed will not only be positive, but also coincide with the speed value.
Uniform rectilinear motion can be represented, among other things, in the form of an equation, which will reflect the relationship between the coordinates of the body and time.
