Сформулируйте вопросы на английском языке и дайте ответы на них. Что называется гравитационной потенциальной энергией? Что называется кинетической энергией? Что такое вес тела?
What is called the gravitational potential energy?
Gravitational potential energy is energy an object possesses because of its position in a gravitational field.
For objects near the Earth the acceleration of gravity g can be considered to be approximately constant and the expression for potential energy relative to the Earth's surface becomes
whereh is the height above the surface and g is the surface value of the acceleration of gravity.
What is called the kinetic energy?
In physics, the kinetic energy of an object is the energy which it possesses due to its motion. It is defined as the work needed to accelerate a body of a given mass from rest to its stated velocity. Having gained this energy during its acceleration, the body maintains this kinetic energy unless its speed changes. The same amount of work is done by the body in decelerating from its current speed to a state of rest.
What is a body weight?
The term body weight is used colloquially and in the biological and medical sciences to refer to a person's mass or weight.
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.
