Сформулируйте вопросы на английском языке и дайте ответы на них. Что такое материальная точка? Что такое радиус-вектор? Что такое твердое тело?
What is the material point? What is the radius vector? What is the rigid body?
Material point is the body size and shape of which can be neglected in given problem.
Radius vector is a vector defining the position of a point in space with respect to a pre-fixed point called the origin.
Rigid body is an idealized model, set of points, the distance between the current positions do not change, no matter what influences the body in motion is subjected to.
Сформулируйте вопросы на английском языке и дайте ответы на них. Что такое уравнение движения? Что такое уравнение траектории?
What is the motion equation? What is the trajectory equation?
Motion equation is an equation or system of equations defining the law of change the position of the mechanical dynamic system in time and space.
The trajectory of a material point - line in space, which is a set of points, which was, is or will be a material point in its movement in space with respect to the chosen reference system. Equation of trajectory describes position of particle in the space at any time.
Сформулируйте вопросы на английском языке и дайте ответы на них. Что такое прямолинейное движение? Что такое криволинейное движение? Какое движение называется поступательным? Какое движение называется вращательным?
What is straight lined motion? What is curvilinear motion? What is translational motion? What is rotational motion?
Straight lined motion is the mechanical motion in which the displacement vector Δr does not change direction; its magnitude is the length of the path traveled by the body.
Curvilinear motion is a movement which trajectory is a curved line (for example, circle, ellipse, hyperbola and parabola).
Translational motion is the mechanical motion system of points (of a rigid body), in which every line segment associated with the moving body remains parallel to its position at any previous time.
Rotational motion rigid body is the mechanical motion when all its points describe circles, arranged in parallel planes. The centers of all circles lie on a line perpendicular to the plane of the circle and called the axis of rotation.
Сформулируйте вопросы на английском языке и дайте ответы на них. Что такое вектор перемещения частицы? Какой величиной является скорость? Что такое средняя скорость? Что такое мгновенная скорость?
What is the displacement vector of a particle? What kind of value is the velocity? What is the average velocity? What is the instantaneous velocity?
Displacement vector is the vector which connects initial and final positions of the particle.
Velocity is the vector value, which is characterized with magnitude and direction. It is a change of displacement vector over time when that change occurred.
Average velocity is atotaldistance of a particle over total time, when particle moved through that distance.
Instantaneous velocity is the time derivative of displacement vector.
Сформулируйте вопросы на английском языке и дайте ответы на них. Какой величиной является ускорение? Что такое среднее ускорение? Что такое мгновенное ускорение? Какие составляющие ускорения вы знаете? Дайте им определения.
What kind of value is the acceleration? What is the average acceleration? What is the instantaneous acceleration? What components of acceleration do you know? Give them definitions.
Acceleration is a vector value, which characterize change of velocity over time, when that change occurred.
Average acceleration is a difference of initial and final velocity of a particle over time whole, when that change occurred.
Instantaneous acceleration is the time derivative of velocity.
Tangential acceleration is a component of total acceleration in curvilinear motion, which characterize changing of magnitude of velocity and directed as same as velocity vector.
Normal acceleration is the component of total acceleration in curvilinear motion, which characterize changing of direction of velocity vector, and directed perpendicular to the tangential acceleration, to the center of circle.
