Among a variety of movements, studied physics in this section as kinematics, is found in which the body for any arbitrarily taken equal intervals of time passes equal length segments of the path.It - uniform motion.An example is the movement of a skater in mid-distance train or on a flat stretch.Theoretically
body can move along any path, including curved.In this way there is a concept - so the distance traveled by the body along its path.Path - a scalar quantity, and it should not be confused with the movement.The latter term we mean interval between the initial and final point of the path that the curvilinear motion obviously does not coincide with the trajectory.Moving - a vector quantity, which has a numeric value equal to the length of the vector.
question arises - when it comes to the uniform motion?It will be considered uniform motion, such as a carousel in a circle at the same speed?No, because if such a motion velocity vector changes its direction every second.
Another example - the car is traveling in a straight line at the same speed.Such a motion shall be deemed uniform, while the car will not roll up and the speedometer it is the same number.It is evident that always a uniform motion in a straight line, the velocity vector is not changed.Path and movement in this case will be the same.
uniform movement - a movement along a straight path at a constant speed at which the length of the path traveled intervals for any equal time intervals are the same.A special case of uniform motion can be considered a state of rest when the speed and distance traveled are equal to zero.
Speed is a qualitative characteristic of uniform motion.Obviously, different objects are the same way in different times (pedestrian and vehicle).Drinking covered uniformly moving body towards the length of time for which the path passes, called speed.
Thus, the formula describing the uniform motion, looks like:
V = S / t;where V - velocity of movement (a vector quantity);
S - path or moving;
t - time.
Knowing the speed, which is constant, we can calculate the path traversed by the body for any arbitrary period of time.
sometimes mistakenly mixed evenly and uniformly accelerated motion.This is a completely different concept.Uniformly accelerated motion - one embodiment of uneven motion (ie. E. That at which the speed is not constant), which has an important feature - the speed with this kind of traffic varies over the same period of time on the same value.This value is equal to the relative speed difference to the length of time for which the rate of change is called acceleration.This number indicates what value to increase or decrease speed per unit time, can be a great (then say that the body is rapidly gaining or losing speed), or minor, when an object accelerates or slows down more smoothly.
Acceleration, as well as speed, is a physical vector quantity.The acceleration vector in the direction always coincides with the velocity vector.An example of a uniformly accelerated motion is the case of the free fall of the subject, in which the rate of incidence (the rate of the earth's surface gravity of the subject) changes per unit of time by a certain amount, known as the acceleration of free fall.
uniform motion in theory can be viewed as a special case of uniformly accelerated.Obviously, since the velocity with this motion is not changed, the acceleration or deceleration does not occur, therefore, the acceleration in the uniform motion is always equal to zero.
