Английский язык. Ильичева Н.А - 26 стр.

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energy. If the book were allowed to fall back to the floor, it could do work, such
as crunching something.

                              Vocabulary Practice

5. Look at the words in bold and try to explain them.

6. Fill in the correct words from the list below
expend, performing, obtain, supplies, requires, accomplish, press down, apply,
rated, consume, possess, fell back, calculate

1. Work ……… not only a force but also motion. (нуждаться, требовать)
2. He lifted the book but then it ……… on the floor. (упасть обратно)
3. Don’t ……… your energy on such a useless job. (тратить)
4. Watt ……… the power of motors and engines in horsepower. (исчислять,
   выражать в чем-либо)
5. Kinetic energy is energy a body ……… because of its motion. (обладать)
6. After ……… a certain amount of work we become tired. (совершать)
7. He tried hard to ……… work. (завершить)
8. We must ……… rest and food in order to continue work. (получать)
9. You should ……… on the handle with all your strength. (нажать)
10. Food ……… the necessary energy. (давать, обеспечивать)
11. We pay electric power companies for the electricity which we ……… .
   (потреблять)
12. To move something, we have to ……… a force. (применять)
13. We ……… power by dividing the work done by the time required to do it.
   (вычислять)

7. Fill in the correct word from the list below. Use the word only once.
net, gravitational, lawn, ability, to give, certain, to produce, change, opposite,
product, fundamental, tired.

1. a ……. amount of work                      7. ……. a change
2. a ……. mower                               8. to become …….
3. a ……. force                               9. ……. potential energy
4. an equal and ……. force                    10. ……. a name
5. a ……. in energy                           11. the ……. of a force and distance
6. a ……. concept                             12. the ……. to do work

8.   Underline the correct word.
1.   When work is done, energy has been expended / wasted.
2.   Work and energy are united / related.
3.   Energy is sometimes called accumulated / stored work.