1. Дополните письменно предложения словами, подходящими по смыслу. 1. At first, a man invented simple to facilitate their
work.
2. So that, complex turned into .
3. Nowadays are everywhere around us.
4. All they make the necessary for a person.
5. The examples of the machines are .
6. Machines consist of three main parts: ,
, and them.
7. If there is the absence of one of the parts, the machine will not
.
8. The is a system whose component parts
are .
9. To sum up, is a device for converting one kind
of motion into another.
10. are devices that perform useful work for a
person and turn one kind of into another.
2. Подберите к каждому слову из правой колонки определение
из левой колонки.
1. Physical value (величина) which characterizes a) wheel
change of a certain object as a result of action of
other bodies on it.
2. Simple mechanism designed to convert motion b) friction
into rotational motion. (трение) force
3. The energy of the compressed spring. c) mechanical
4. Force due to the motion of a body on the surface d) manmade
of another.
5. Systems that man creates to facilitate his work. e) work
3. Напишите своими словами о чём говорится в тексте.
IT IS INTERESTING TO KNOW…
The first invented mechanism was the lever (рычаг). Most likely,
the first lever was a stick with which people pulled from the ground
eatable roots or wrested stones
