Минобрнауки России
Федеральное государственное образовательное учреждение высшего профессионального образования
Санкт-Петербургский государственный технологический институт
(технический университет)
Кафедра иностранных языков
И.В. Лобода, С.Б. Теремязева Английский язык
для студентов заочной формы обучения механического факультета
Методические указания
Санкт-Петербург
2012
Стоимость выполнения контрольной работы по английскому языку уточняйте при заказе.
Выполнены следующие работы (стоимость готового уточняйте):
Урок 6
Mass
The term «mass» refers to that property of matter which in everyday language is described by the word «inertia». We know from experience that an object at rest will never start to move by itself – a push or a pull must be exerted on it by some other body. In more technical language, an external force is required to accelerate the body, and the force is said to be needed because the body has inertia.
It is also a well known fact that a force is required to slow down or to stop a body which is already in motion, and that a sidewise force must be exerted on a moving body to deviate it from a straight line. In these cases the force is known to be necessary because the body has inertia.
In every case the body is accelerated. The inertia is considered to be that property of matter because of which a force must be exerted on a body in order to accelerate it.
To have a numerical value of the inertia of a body, we take as a standard some body whose inertia is taken as unity, and state the inertia of all other bodies in terms of this standard. The inertia of a body, when stated in this quantitative way, is called its mass. Mass is a quantitative measure of inertia.
The mass of a body is an invariant property of the body, independent of its velocity, acceleration, position on the earth’s surface it differs from the weight of the body, which varies with position and elevation.
1. Ответьте на вопросы:
1. What property of matter does the term «mass» refer to?
2. Will an object at rest start to move by itself?
3. What kind of force is required to accelerate, to slow down or to stop the body?
4. Why is the external force necessary in all these cases just mentioned?
5. What is the inertia of a body?
6. What is the mass of a body?
7. What is the difference between the mass and the weight of the body?
2. Определите, к каким частям речи относятся следующие слова:
property, describe, experience, object, technical, acceleration, force, motion, accelerate, external, unity, quantitative, measure, necessary.
3. Переведите не английский язык:
ссылаться, свойство, вещество, предмет (тело), двигаться, требовать, ускорять, сила, движение, инерция, эталон, единица, мера.
4. Переведите на русский язык:
at rest, by itself, an external force, a moving body, in these cases, in order to, a numerical value, in terms of.
5. Переведите и определите функцию инфинитива:
1. The mechanical systems are often too simple to be of any practical interest.
2. To drive machines requires power.
3. To observe is the primary rule of any experiment.
4. An electric current is known to be a stream of electrons in motion.
5. When the currents to be detected and measured are very small, one should use a galvanometer.
6. To stop the flow of current is to break the circuit in some point.
7. Various switches are generally used to open or close the circuits.
8. A battery is the simplest device to produce direct current.
9. This device proved to be useful for our tests.
10. Electronic equipment is likely to find an ever growing application.
11. An electron is said to move in an orbit.
12. The bodies are said to have the same mass when they have the same weight.
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