Сформулируйте вопросы на английском языке и дайте ответы на них. Какое произведение векторов называется скалярным? Какая сила называется консервативной? Какая сила называется неконсервативной?
What is called scalar product of vectors?
An angle α between non-zero vectors AB and CD is an angle, formed at a parallel transfer one of the vectors till coinciding the points A and C. A scalar product of vectors a and b is called a number, equal to a product of lengths ( modules )of these vectors by cosine of angle between them:
Примечание: стоит нарисовать векторную диаграмму, обозначив все вектора и угол.
What force is called conservative?
A conservative force is a force with the property that the work done in moving a particle between two points is independent of the taken path. Examples: gravitational force, Coulombs force, elastic force.
What force is called nonconservative?
Nonconservative forces are forces, which depend on the way of transition of a body or system from the initial position to the end position. The work of these forces on the closed trajectory is different from zero. Example: friction force, traction force (сила тяги).
Сформулируйте вопросы на английском языке и дайте ответы на них. Какие величины называются скалярными? Какие величины называются векторными?
Which values are called scalar values?
Scalar values are characterized only by magnitude. Example: time, temperature.
Which values are called vector values?
Vector values are characterized by magnitude and direction. Example: velocity, force, est.
Сформулируйте вопросы на английском языке и дайте ответы на них. Какие правила векторного сложения вы знаете? Опишите их и нарисуйте.
What rules of vector addition do you know? Describe and draw.
The parallelogram law
draw vector 1 using appropriate scale and in the direction of its action
from the tail of vector 1 draw vector 2 using the same scale in the direction of its action
complete the parallelogram by using vector 1 and 2 as sides of the parallelogram
the resulting vector is represented in both magnitude and direction by the diagonal of the parallelogram
The triangle law
draw vector 1 using appropriate scale and in the direction of its action
from the nose of the vector draw vector 2 using the same scale and in the direction of its action
the resulting vector is represented in both magnitude and direction by the vector drawn from the tail of vector 1 to the nose of vector 2.
Сформулируйте вопросы на английском языке и дайте ответы на них. Что такое работа силы по перемещению частицы? Что такое мощность силы?
What is the working of force on the movement of particle?
Work is the scalar product of the force vector and the practice displacement vector. Mesured in joules.
What is the power of force?
Power is the amount of energy (done work of force) consumed per unit time. Measured in watts.
