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9.5 Space journey — travelling in space 1 Space journey — travelling in space 9. 5 Hi!

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Presentation on theme: "9.5 Space journey — travelling in space 1 Space journey — travelling in space 9. 5 Hi!"— Presentation transcript:

1 9.5 Space journey — travelling in space 1 Space journey — travelling in space 9. 5 Hi!

2 9.5 Space journey — travelling in space 2 Let’s take a look at the journey in space.

3 9.5 Space journey — travelling in space 3 Spacecraft in frictionless motion no air in space no air resistance ✘

4 9.5 Space journey — travelling in space 4 Spacecraft in frictionless motion in frictionless motion

5 9.5 Space journey — travelling in space 5 Spacecraft in frictionless motion Space shuttle orbiting the Earth does not need to fire its engine

6 9.5 Space journey — travelling in space 6 Living in a spacecraft Let’s take a look at our life in space!

7 9.5 Space journey — travelling in space 7 Weightlessness When a spacecraft is orbiting the Earth … astronauts float around and do not feel their weight weightlessness ( 無重 )

8 9.5 Space journey — travelling in space 8 Weightlessness force exerted on the ground by you reaction exerted on you by the ground That’s why you feel your weight.

9 9.5 Space journey — travelling in space 9 Weightlessness Under what conditions can we feel weightless?

10 9.5 Space journey — travelling in space 10 Weightlessness When the supporting reaction force disappears …

11 9.5 Space journey — travelling in space 11 Weightlessness Just like when you are on a turbo drop … Wow!

12 9.5 Space journey — travelling in space 12 Weightlessness both you and your seat fall freely separated from the seat; no reaction force to support you

13 9.5 Space journey — travelling in space 13 Weightlessness When a spacecraft is orbiting the Earth … astronauts float inside no action force on the spacecraft no reaction force from the spacecraft astronauts feel weightless

14 9.5 Space journey — travelling in space 14 http://www.universeto day.com/95308/why- are-astronauts- weightless-in-space/

15 9.5 Space journey — travelling in space 15 A spacecraft travelling in space is in frictionless motion. Spacecraft in frictionless motion

16 9.5 Space journey — travelling in space 16 Living in a spacecraft Astronauts feel weightless in space.

17 9.5 Space journey — travelling in space 17 Daily life inside a spacecraft Foods are individually packaged and precooked.

18 9.5 Space journey — travelling in space 18 Daily life inside a spacecraft Water is recycled from astronauts’ urine as the supply of water is limited.

19 9.5 Space journey — travelling in space 19 Daily life inside a spacecraft Astronauts stand by fixing their feet in foot restraints.

20 9.5 Space journey — travelling in space 20 Daily life inside a spacecraft Astronauts exercise regularly to keep bones and muscles strong.

21 9.5 Space journey — travelling in space 21 Daily life inside a spacecraft When sleeping, they fix themselves in ‘beds’ to avoid floating around.

22 9.5 Space journey — travelling in space 22 Daily life inside a spacecraft Astronauts move like divers under weightless conditions.

23 9.5 Space journey — travelling in space 23 Daily life inside a spacecraft What other problems do astronauts face in space?

24 9.5 Space journey — travelling in space 24 9.4 Living in space Match one solution to each of the problems.

25 9.5 Space journey — travelling in space 25 9.4 1In space, there is no air for astronauts to breathe. aThe spacecraft are equipped with big solar panels to collect solar energy from the Sun and to change the solar energy to electrical energy. bThe spacecraft must be airtight to prevent air from leaking into space. In addition, water is broken down by electricity to produce oxygen. cAstronauts communicate with each other using radio signals.

26 9.5 Space journey — travelling in space 26 9.4 aThe spacecraft are equipped with big solar panels to collect solar energy from the Sun and to change the solar energy to electrical energy. bThe spacecraft must be airtight to prevent air from leaking into space. In addition, water is broken down by electricity to produce oxygen. cAstronauts communicate with each other using radio signals. 2The spacecraft may not be able to carry enough cells to power all its equipment for its whole journey. solar panels

27 9.5 Space journey — travelling in space 27 9.4 aThe spacecraft are equipped with big solar panels to collect solar energy from the Sun and to change the solar energy to electrical energy. bThe spacecraft must be airtight to prevent air from leaking into space. In addition, water is broken down by electricity to produce oxygen. cAstronauts communicate with each other using radio signals. 3Sound cannot travel in space because there is no air in space. Astronauts working outside the spacecraft cannot talk to each other directly.

28 9.5 Space journey — travelling in space 28 Due to the condition of weightlessness and the limited supply of resources, astronauts have difficulty in doing everyday activities such as eating, drinking and sleeping. Scientists have found ways to solve these problems. Daily life inside a spacecraft

29 9.5 Space journey — travelling in space 29 Working outside a spacecraft What’s the difference between working on Earth and working in space?

30 9.5 Space journey — travelling in space 30 Working outside a spacecraft Problems faced when working outside the spacecraft in space: no air to breathe exposed to extreme temperatures and strong radiations may be hit by tiny meteoroids

31 9.5 Space journey — travelling in space 31 Working outside a spacecraft Astronauts must wear spacesuits ( 太空衣 ) to protect themselves.

32 9.5 Space journey — travelling in space 32 Working outside a spacecraft How do spacesuits work?

33 9.5 Space journey — travelling in space 33 Working outside a spacecraft First, let’s learn about some ways heat is transferred.

34 9.5 Space journey — travelling in space 345 1aAstronauts feel weightless in space because there is no air in space. FT

35 9.5 Space journey — travelling in space 355 bAstronauts in space exercise regularly to keep their bones and muscles strong. FT

36 9.5 Space journey — travelling in space 365 cThere is no air in space. FT

37 9.5 Space journey — travelling in space 375 2State two features of a spacesuit and explain how they protect astronauts when they work outside a spacecraft.

38 9.5 Space journey — travelling in space 385 2The visor is coated with a thin layer of gold: it reflects strong sunlight to protect the astronaut’s eyes.

39 9.5 Space journey — travelling in space 395 2The outermost garment is shiny and white in colour: it reflects heat transferred by radiation to protect the astronaut from the strong direct sunlight. (Accept other reasonable answers.) Excellent!


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