Сформулируйте вопросы на английском языке и дайте ответы на них. Какое движение называется равномерным? Какое движение называется равноускоренным? Какое движение называется равнозамедленным?
Which motion is called uniform motion? Which motion is called uniformly accelerated motion? Which motion is called uniformly decelerated motion?
Uniform motion is the mechanical motion in which the body for any equal intervals of time passes the same distance, so velocity of this body is constant.
U
niformly
accelerated motion is
a motion when vector of acceleration, which is not equal zero, does
not change during time interval and directed the same as velocity
vector.
Uniformly decelerated motion is a motion when vector of acceleration, which is not equal zero, does not change during time interval and directed the oppositely to the velocity vector.
For example: motion of the body, which was thrown at an angle from the horizon. Vector of acceleration (free falling acceleration) is constant value and directed perpendicular to the surface of the Earth.
Сформулируйте вопросы на английском языке и дайте ответы на них. Что такое полярная система координат? Что такое угол поворота? Что такое угловая скорость? Что такое угловое ускорение? Что называется периодом и частотой вращения?
What is the polar coordinate system? What is the angle of rotation? What is the angular velocity? What is the angular acceleration? What is called period and frequency?
P
olar
coordinate system is
the two-dimensional coordinate system in which each point on the
plane is defined by two numbers - the polar angle and polar radius.
Angular velocity characterizes the rate of rotation around the center of mass point of rotation. The angular velocity for the magnitude equal to the angle of rotation around the center point of rotation per unit time:
Angular acceleration characterizes the rate of change of the angular velocity of the material point. For magnitude it equals time derivative of angular velocity.
Angle of rotation characterizes the rotation of the body, or rotating beam emitted from the center of rotation of the body, relatively to the other beam which is considered fixed.
Period is the time of one total rotation of body around rotation axis.
Frequency is the amount rotations over per unit time.
Сформулируйте вопросы на английском языке и дайте ответы на них. Как вы понимаете понятие относительности? Что является объектом изучения динамики?
How do you understand the concept of relativity? What is the object of studying of dynamics?
The theory of relativity, or simply relativity in physics, usually encompasses two theories by Albert Einstein: special relativity and general relativity. Albert Einstein, in his theory of special relativity, determined that the laws of physics are the same for all non-accelerating observers, and he showed that the speed of light within a vacuum is the same no matter the speed at which an observer travels. As a result, he found that space and time were interwoven into a single continuum known as space-time. Events that occur at the same time for one observer could occur at different times for another.
The object of study of dynamics is the reason of motion, forces.