Английский - 2курс_3семестр_physics

 with „always‟ for actions happening too often and about which we wish to express our annoyance or criticism.

―You‟re always interrupting me!‖ (annoyance)

 for fixed arrangements in the near future.

He is flying to Milan in an hour. (It‘s been arranged.)

Time Expressions

Time expressions used with the present indefinite include: usually, always

(adverbs of frequency), etc., every day/week/month/year, etc., on Mondays/ Tuesdays, etc., in the morning/afternoon/evening, at night/the weekend, etc.

The present indefinite is used for:

permanent states.

repeated actions or daily routines (often with adverbs of frequency

such as: always, never, usually, etc.).

Mr Gibson is a businessman. He lives in New York. (permanent state)

11

He usually starts work at 9 am. (daily routine)

He often stays at the office until late in the evening. (daily routine)

general truths or laws of nature.

The moon moves round the earth.

programmes or timetables (trains, buses, etc.).

The bus leaves in ten minutes.

EXERCISES

1. Fill in the gaps with the present continuous.

1)We ……are/’re tidying……(tidy) the garden.

2)I … (not/do) my homework.

3)John … (study) at university.

4)… (you/listen) to the radio?

5)… (Dad/paint) the living-room?

2. Fill in the gaps with the present indefinite.

1)A: Where …is… (be) Jack?

B:At school.

2)A: … (you/come) here very often?

B:Yes, every evening.

3)A: I … (play) tennis in the summer.

B:Really? So do I!

4)A: I … (leave) the house at 6:30 every morning.

B:That‘s very early.

5)A: Sam … (not/know) anything about the party.

B:I know. It‘s a surprise.

3.Put the verbs in brackets into the correct form of the present continuous or the present indefinite.

12

Charlie Foster 1) …works… (work) at a bakery. He 2) … (always/get up) very early because he 3) … (start) work at four o‘clock every morning. Charlie 4) … (not/be) at work this morning. At the moment he 5) … (pack) a suitcase because he 6) … (go) on holiday today. Charlie 7) … (sing) to himself. He‘s very happy. Right now he 8) … (look for) his airplane tickets. Where are they? He can‘t find them. There they are; under his bed! Charlie 9) … (call) a taxi now. His plane 10) … (leave) in an hour. Where 11) … (Charlie/go)? To Hawaii!

4. Rewrite the sentences putting the adverb in brackets in the correct place.

1)You must brush your teeth twice a day. (always)

You must always brush your teeth twice a day.

2)Is he on time for work? (always)

3)Karen has cereal for breakfast. (sometimes)

4)Paul doesn‘t listen to music in the evening. (usually)

5)The children help with the housework. (rarely)

6)Must you play your music so loud? (always)

7)Sheila can park her car properly. (never)

5. Correct the mistakes.

1)Steve goes fishing tomorrow.

2)Rebecca wash her hair every day.

3)I am visiting my grandparents every week.

4)Tim doesn‘t wants to do his homework.

5)He sits on the floor at the moment.

6)Do you watch TV in the evenings always?

7)Sarah is drinking coffee every morning.

8)They don‘t go usually on holiday in May.

9)Does she work late? No, she does never.

13

UNIT 2

What is Physics?

Read the text and translate it into Ukrainian.

Answer the following questions:

1.What is physics?

2.What is matter?

3.What is light?

4.What can you say about the boundary between physics and the other sciences?

5.What do you know about modern changes in the definition of light and matter?

Given for one instant an intelligence which could comprehend all the forces by which nature is animated and the respective positions of the things which compose it … nothing would be uncertain, and the future as the past would be laid out before its eyes.

Pierre Simon de Laplace

Physics is the use of the scientific method to find out the basic principles governing light and matter, and to discover the implications of those laws. Part of what distinguishes the modern outlook from the ancient mind-set is the assumption that there are rules by which the universe functions, and that those laws can be at least partially understood by humans. From the Age of Reason through the nineteenth century, many scientists began to be convinced that the laws of nature not only could be known but, as claimed by Laplace, those laws could in principle be used to predict everything about the present state of all light and matter.

Matter can be defined as anything that is affected by gravity, i.e., that has weight or would have weight if it was near the Earth or another star or planet

14

massive enough to produce measureable gravity. Light can be defined as anything that can travel from one place to another through empty space and can influence matter, but has no weight. For example, sunlight can influence your body by heating it or by damaging your DNA and giving you skin cancer. The physicist‘s definition of light includes a variety of phenomena that are not visible to the eye, including radio waves, microwaves, x-rays, and gamma-rays.

These are the ―colors‖ of light that do not happen to fall within the narrow violet-to-red range of the rainbow that we can see.

Many physical phenomena are not themselves light or matter, but are properties of light or matter or interactions between light and matter. For instance, motion is a property of all light and some matter, but it is not itself light or matter. The pressure that keeps a bicycle tire blown up is an interaction between the air and the tire. Pressure is not a form of matter in and of itself. It is as much a property of the tire as of the air. Analogously, sisterhood and employment are relationships among people but are not people themselves.

Some things that appear weightless actually do have weight, and so qualify as matter. Air has weight, and is thus a form of matter even though a cubic inch of air weighs less than a grain of sand. A helium balloon has weight, but is kept from falling by the force of the surrounding more dense air, which pushes up on it. Astronauts in orbit around the Earth have weight, and are falling along a curved arc, but they are moving so fast that the curved arc of their fall is broad enough to carry them all the way around the Earth in a circle. They perceive themselves as being weightless because their space capsule is falling along with them, and the floor therefore does not push up on their feet.

The boundary between physics and other sciences is not always clear. For instance, chemists study atoms and molecules, which are what matter is built from, and there are some scientists who would be equally willing to call

15

themselves physical chemists or chemical physicists. It might seem that the distinction between physics and biology would be cleaner, since physics seems to deal with inanimate objects. In fact, almost all physicists would agree that the basic laws of physics that apply to molecules in a rest tube work equally well for the combination of molecules that constitutes a bacterium. (Some might believe that something more happens in the minds of humans, or even those of cats and dogs.) What differentiates physics from biology is that many of the scientific theories that describe living things, while ultimately resulting from the fundamental laws of physics, cannot be rigorously derived from physical principles.

Explain the meaning of the following words:

a principle, to predict, a molecule, to constitute, to agree

Self-check.

At the turn of the 20th century, a strange new phenomenon was discovered in vacuum tubes: mysterious rays of unknown origin and nature. These rays are the same as the ones that shoot from the back of your TV‘s picture tube and hit the front to make the picture. Physicists in 1895 didn‘t have the faintest idea what the rays were, so they simply named them ―cathode rays,‖ after the name for the electrical contact from which they sprang. A fierce debate raged, complete with nationalistic overtones, over whether the rays were a form of light or of matter. What would they have had to do in order to settle the issue?

Discussion Questions.

AThe author of the text has suggested replacing the ordinary dictionary definition of light with a more technical, more precise one that involves weightlessness. It‘s still possible, though, that the stuff a lightbulb makes,

16

ordinarily called ―light,‖ does have some small amount of weight. Suggest

an experiment to attempt to measure whether it does.

BHeat is weightless (i.e., an object becomes no heavier when heated), and can travel across an empty room from the fireplace to your skin, where it influences you by heating you. Should heat therefore be considered a form of light by our definition? Why or why not?

CSimilarly, should sound be considered a form of light?

GRAMMAR

The Past Indefinite Tense

Affirmative

I

You/We/They

Interrogative

I

Did he/she/it finish / leave? you/we/they

Negative

I

He/She/It did not didn‟t finish / leave. You/We/They

Time Expressions

Time expressions used with the past indefinite include: yesterday, last night/week/month/year/Monday, etc., two days/weeks/months/years ago, then, when, in 1992, etc.

17

We use the past indefinite:

for actions which happened at a definite time or stated time in the past; that is, we know when they happened.

They graduated four years ago. (When did you graduate? Four years

ago. We know the time.)

for actions which happened repeatedly in the past but don‟t happen any more. In this case we use adverbs of frequency

(always, often, usually, etc.).

He often played football with his dad when he was five. (But he doesn‘t

play football with his dad any more.)

for actions which happened immediately one after the other in the past.

They cooked the meal first. Then they ate with their friends.

to talk about people who are no longer alive.

Princess Diana visited a lot of schools.

18

Time Expressions

Time expressions used with the past continuous include: while, when, as,

all day/night/morning, etc.

when/while/as + past continuous (longer action) when + past indefinite (shorter action)

We use the past continuous:

for an action which was in progress at a stated time in the past. We do not know when the action started or finished.

At three o‘clock yesterday afternoon Mike and his son were washing the dog. (We do not know when they started or finished washing the dog.)

for a past action which was in progress when another action interrupted it. We use the past continuous for the action in progress (longer action) and the past indefinite for the action

which interrupted it (shorter action).

He was reading a newspaper when his wife came. (was reading = longer

action; came = shorter action)

for two or more actions which were happening at the same time in the past (simultaneous actions).

The people were watching while the cowboy was riding the bull.

to give the background information in a story.

The sun was shining and the birds were singing. Tom was driving his

old truck through the forest.

19

EXERCISES

1. Put the verbs in brackets into the past indefinite.

Ferdinand Magellan 1) …was… (be) a Portuguese sailor who 2) … (want) to sail around the world. Emperor Charles V of Spain 3) … (give) him five ships and two hundred and sixty-five Spanish sailors. They 4) … (leave) Spain on 20th

September, 1519 and 5) … (begin) their long and dangerous journey.

On the journey, Magellan 6) … (discover) the Pacific Ocean. Unfortunately, he and many of the sailors 7) … (die) in a battle on 27th April, 1521. After that, a

Spanish sailor 8) … (take) control of the ships and 9) … (set off) to complete the voyage. Only one ship and sixteen men 10) … (survive) the journey. They 11) … (arrive) back in Spain on 6th September, 1522. They 12) … (be) the first men to sail around the world.

2. Put the verbs in brackets into the past continuous.

-What 1) …was happening… at the time of the robbery?

-Well, I 2) … (sit) in my office. I 3) … (talk) to an employee. Some of the staff 4) … (put) food onto the shelves. Several customers 5) … (do) their shopping

and a cashier 6) … (stand) behind the till.

-Can you tell me anything about the robbers?

-Yes. They 7) … (wear) black masks and they 8) … (hold) guns. They 9) …

(shout).

-How did they get away?

-They drove off in a car which 10) … (wait) outside.

3. Put the verbs in brackets into the past continuous or the past indefinite.

1)We …went… (go) swimming every week when we were young.

2)Simon … (dance) when he fell and hurt his leg.

3)Why … (you/laugh) all through your history lesson yesterday?

4)I … (drink) a glass of milk every day when I was a child.

20