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5、

 

Falling and gravity

About 400 years ago, Caltleo

noticed that objects speed up,

or accelerate, as they fall.

 

He found that heavy and light

things, of the same shape and

size, take the same time to fall

to the ground. Gravity pulls

then-* down equally.

 

Try this for yourself with

different objects, like a slipper :

and a heavy boot.

 

Air resistance

Objects of different shapes and

sizes fall at different rates.  The

shape of a parachute makes

people fall more slowly.

 

 

The air pushing

against the parachute

causes a lot of air

resistance*. A person

without a parachute

falls faster because less

air pushes against

them.

The faster something falls, the

more air resistance there is on

it. Eventually, the air resistance

 slowing it down becomes as

strong as the pull of gravity.

Then its speed no longer

changes. This is called terminal

speed.

Free fall

If there were no air, there would be no air

resistance. All falling objects would just get

faster and faster < called is This rate. same the>

free fall.

 

67. Falling objects are pulled down to the ground by   .  

A. gravity                         B. resistance              C. speed                   D. acceleration(加速度)  

68. Why do people make parachutes(降落傘)?  

A. To look pretty and colourful in the air.            B. To slow down the falling speed.  

C. To push against the air in the sky.                  D. To accelerate the falling movement.  

69. Which did Galileo discover?  

A. A heavy ball falls faster than a light ball.          B. A light ball falls faster than a heavy ball.  

C. A light ball and a heavy ball fall at the same speed

D. A light ball and a heavy ball fall at different speed.

70. Which of the following is NOT true according to the passage?

A. Heavy and light objects fall equally when they are different in size.

B. When air resistance equals gravity, objects fall at terminal speed.

C. Without air; all falling objects get faster and faster at the same rate.

D. Slippers(拖鞋) and boots (靴子)fall at the same speed because they have the same shape  

 

5、 67-70 ABCA  

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相關(guān)習(xí)題

科目:高中英語(yǔ) 來(lái)源: 題型:閱讀理解

The film The Tides of Kirawira, which won two prizes at a recent television festival, was made by Mark Deeble and Victoria Stone. The couple are in England to visit friends and family before heading back to Tanzania for their next film. Their work takes them to some of the world’s least – known areas but they still find themselves drawn back to England, particularly to Cornwall, where their work and personal relationship developed.

“We net in London when Mark was studying biology and I was at the Royal College of Art studying photography,” says Victoria. “We both learned to dive at the same pool in London and went on diving weekends in the country. It was a terrible place, freezing cold, where dived in wet suits full of holes. But that is where our relationship developed.”

After completing their studies they took part in the management of a conservation area in the mouth of the River Fal in Cornwall. “We were shocked. Nobody seemed to understand the river’s ecological importance. So we thought, why don’t we make a film to show people what a special place it is? Neither of us had any experience of filming but we took part – time jobs until we had enough cash to buy an underwater camera and some film.” A television company agreed to provide money for the work and the film they produced about the underwater life of the River Fal was shown on television and won a number of prizes.

By then, they both knew they wanted to work with wildlife in distant places around the world. Alkan Root, a famous East African wildlife film – maker, asked them to work for him. That was seven years ago and the job took them to the Serengeti to film crocodiles. Their films, Here Be Dragons and Devil Fish, were very successful.

“We love Africa but we have to come back to England every year,” says Victoria. “We need to return to see our friends and family. For us, Africa is temporary and England means permanence. It’s the difference between living in a tent in Tanzania and a house in Cornwall. We are lucky … we have the best of both worlds.”

1.Mark and Victoria have returned to England to         .

       A.a(chǎn)ppear on television                              B.make a film about Cornwall

       C.have a break between films                   D.receive a prize for their new film

2.Victoria regards her weekends learning to dive as         .

       A.a(chǎn) waste of time                                    B.a(chǎn)n unforgettable experience

       C.a(chǎn)n enjoyable activity                             D.good exercise for health

3.The purpose of filming in the River Fal was to        .

      A.earn money                                         B.educate people

       C.gain photographic experience                D.make a television program

4.What does Victoria mean when she says “we have the best of both worlds” (last paragraph)?

       A.They can live in both a tent and a house.

       B.They can film in Cornwall as well as in Africa.

       C.They can visit both friends and family at the same time.

       D.They are happy and successful both in Africa and England.

查看答案和解析>>

科目:高中英語(yǔ) 來(lái)源: 題型:閱讀理解

The film The Tides of Kirawira, which won two prizes at a recent television festival, was made by Mark Deeble and Victoria Stone. The couple are in England to visit friends and family before heading back to Tanzania for their next film. Their work takes them to some of the world’s least-known areas but they still find themselves drawn back to England, particularly to Cornwall, where their work and personal relationship developed.

“We met in London when Mark was studying biology and I was at the Royal College of Art studying photography,” says Victoria. “We both learned to dive at the same pool in London and went on diving weekends in the country. It was a terrible place, freezing cold, where we dived in wet suits full of holes. But that is where our relationship developed.”

After completing their studies they took part in the management of a conservation area in the mouth of the River Fal in Cornwall. “We were shocked. Nobody seemed to understand the river’s ecological importance. So we thought, why don’t we make a film to show people what a special place it is? Neither of us had any experience of filming but we took part-time jobs until we had enough cash to buy an underwater camera and some film.” A television company agreed to provide money for the work and the film they produced about the underwater life of the River Fal was shown on television and won a number of prizes.

By then, they both knew they wanted to work with wildlife in distant places around the world. Alkan Root, a famous East African wildlife film-maker, asked them to work for him. That was seven years ago and the job took them to the Serengeti to film crocodiles. Their films, Here Be Dragons and Devil Fish, were very successful.

“We love Africa but we have to come back to England every year,” says Victoria. “We need to return to see our friends and family. For us, Africa is temporary and England means permanence. It’s the difference between living in a tent in Tanzania and a house in Cornwall. We are lucky… we have the best of both worlds.”

 

61.Mark and Victoria have returned to England to ___________.

    A. appear on television                               B. make a film about Cornwall

   C. have a break between films                     D. receive a prize for their new film

62.Victoria regards her weekends learning to dive as __________.

    A. a waste of time                                     B. an unforgettable experience

    C. an enjoyable activity                               D. good exercise for health

63.The purpose of filming in the River Fal was to _________.

    A. earn money                                                 B. educate people

    C. gain photographic experience                        D. make a television program

64.What does Victoria mean when she says “we have the best of both worlds” (last paragraph)?

       A. They can live in both a tent and a house.

B. They can film in Cornwall as well as in Africa.

C. They can visit both friends and family at the same time.

D. They are happy and successful both in Africa and England.

查看答案和解析>>


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