9级 gold 22本how does it work

1、CollinsBIGCATPublished by Collin sLo ndon SEl 9GF resp ons i ble sources$MPa p mFSCwww.fSC 叩 FSC- C007454An imprint of Ho rperCo llin sPub lisher sThe News Build ing1 London Bridge Street Brows e the complete Collins catalogue atw w w .c o ll i ns .c o . u k Har perCo llin s Publishers Lim ited 2005

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9、 tSylvia Karavis and Gill MatthewsRoger GoodeContentsHow does a magnetic building kit work?2 How does a magnetic drawing board work?4 How does a friction car work?6How does a scooter work?8 How does a yo-yo work?10How does a press-bottom toy work?12 How does a kaleidoscope work?14 How does a kite wo

10、rk?16How does a boomerang work?18How does it work?20 Glossary22Index23Collins多. 扣 e。 a,nagnetic buildingkit WOTk?You can use a magnetic building kit to make all sorts of shapes. There are some small magnetic rods and ball bearings in the kit.magnetic rodsball bearings All magnets have a south pole a

11、nd a north pole.When you put the north end of a magnet near the south end of another magnet, they join together. This is because the opposite ends of magnets attract each other.You put the ball bearings between the rods so that you can make interesting shapes.Did youknow?吓e needle ofFACTIf you put t

12、he north end of a magnetnear the north end of another magnet, they will pusheach other awaya magnet.Oa compass 1s一 心。 a1nagnetic dTawingboaTd woTk?ma gne甘c pensliding magnetYou write on a magnetic drawing board with a magnetic pen. You move the sliding magnet up and down to rub out what you have wri

13、tt en.勺 Inside a magnetic drawing boardmiddlebackThe screen has three parts. The front and back parts are pieces of plastic. The middle part is also plastic and looks like a honeycomb. It is filled with a thick liquid. In the liquid are tiny magnetic pieces.frontclear plastica honeycombWhen you draw

14、 on the front screen with the magnetic pen, the pieces are attracted to the top of the liquid. This means that you can see them through the screen.When you move the slidingDid you know?are waterproof, so diverMagnetic drawing boards can use them to pass messages to each other underwater .magnet up a

15、nd down, the magnetic pieces are attracted to the bottom of the liquid.This means you cant see them so the screen is clear.6 多. 扣 e忒afTiction caT woTk?J -A friction car moves by itsel仇f you rubthe wheels along the ground, then let it go.Inside a friction caT4 flywheel1 When you rub the wheels along

16、the ground, the friction makes the axle turn.2 The axle makes the cogs turn.3 The cogs make the flywheel turn.7 4 As the flywheel turns faster and faster, it stores more energy. This means that when you let go of the car it will move quickly.make it move. ascooteT woTk?A scooter is a toy you can rid

17、e on. You need to apply force to勺 For the scooter to move, you need to hold onto the handlebars, stand with one foot on the platform and push your other foot on the ground. The harder you push on the ground, the faster the scooter will go.handlebars、wheel/sstanding stillapplying forcemoving forwards

18、Did youknow?You can make a force by pushing, pulling, squashing or stretchingWhat do you thinkWill a scooter gofaster on a smooth path or on grass?扣 e多. 心忒 a yo-yo woTk?stringInside a yo-yoA yo-yo is a round toy fixed to a piece of string.4It can be made of wood, metal or plastic.A yo-yo has four pa

19、rts.axleouterouter case of1You let go the yo-yo.towards theground because2 The yo-yo falls，gravity pulls it.I 3 The spinning axlegrips the string and makes the yo-yo sta 甘 torewind.4 ，一You tug the string to keep the yo-yo moving.apTess-bottotn toy woTk?羲These small wooden toys stand still, but when

20、you press the button at the bottom, they bend and fall down.Parts of a pTess-bottom toylegspress button12bottomInside a pTess-bottom toyWhen you press the bottom it squeezes the spring.This makes the thread loose, so that the toybends and falls down. strong thread扣 e多. a kaleidoscope woTk?A kaleidos

21、cope is a toy that makes patterns. It looks like a telescope, but instead of seeing through it, you look into it.勺 Inside a kaleidoscopeLook here small piecesofmain tubecoloured glassAs you look into the kaleidoscope and turn the cap, the pieces of coloured glass move. You see patterns because light

22、 shines through the glass cap onto the mirrors and they reflectthe coloured glass many times.coloured glassmirrors像一 扣e S 心 a拿 akitewoTk?a box kitea diamond kitea stunt kiteKites come in many shapes and sizes, but they all use the wind to fly.16A kite is a frame covered in light material.It has a th

23、 in, strong piece of string tied tothe fra me. As you hold up a kite, air lifts itlight materialup so that it can fly.frame ._tailstringazr。Did you know?Before aeroplanes wereinvented, people used kitesThere are big kite competitionswhere people show off the tricks they can do.to fly camerasto take1

24、7pictures of the Earth忒 今. 扣 eaboo11eTang woTk?尸 勺A boomerang is a curved piece of wood or plastic. When you throw a boomerang, it comes back to you instead of travelling in a straight line.boomerang flight pathA boomerang has two wings that are flat on one side and rounded on the other - just hke a

25、n aeroplane wing.This means that a boomerang stays up in the air longer than a flat piece of wood .lean to one side so that it travels in a circle and comes back to you.The boomerang spins round when you throw it because it is curved. This spinning means that there is a stronge叮orce on the top of th

26、e boomerang. This makes the boomerangHow does it woTk?ToymagneticbuildingkitticboaTdfriction caT scooteTyo-yopTess-bottom toy eidoscope-HowitwoTksmagnetse and gravity light and mi 六 OTSforce and shape0GlossaTThese words are in bold print the 和 st time they appearin this book.axle attract compass cog

27、flywheelforce gravitya rod joining two wheelsbe pulled towards something an object for finding directiona wheel with teeth which turns anotherwheela wheel which is used to increase a machines energya push or pull that makes an object movea force that pulls everything towardsthe centre of the Earth气

28、，Indexau17, 19axle7, 10, 11ball bearings2, 3cog7energy7friction6, 7,gravity11magnet3, 4, Smagnetic2, 3, 4, Splastic5, 10, 18spnng12, 13wood10, 18, 19azaanbs Ol 人SDa s1 6uuds aUl lDUl OS ELd斗lDd llOO山 S D U0 6dS.laMSUV;,Ideas forguided reading 名 Written by Alison Tyldesley MA PGCE Education, Childhoo

29、d and Inclusion LecturerLearning objectives: skimming a text to find out what it is about; evaluating the usefulness of a text; reading and understanding new topic-related words;using language and gesture when explaining a diagram/model.Interest words: magnetic, honeycomb , friction, flywheel, gravi

30、ty, spring, kaleidoscope, boomerang, Aborigines, attract, compass, forceWord count: 698 Curriculum links: Art and des ign : Investigate materials; Science: Forces and movementGetting startedThis book may be read over two sessions Read the title and look through the book. Allow time for the children

31、to一look carefully at the illustrations and diagra m s. Discuss what type of book it is (an explanation text). What do they know about this type of book? (Its purpose is to explain how things work in a series of logical steps.) Focus on the contents page. Ask th echildren to find something that inter

32、ests them and find the appropriate page . Tum to a spread and model how to skim the pages for information and illus trations . Model how to read multisyllabic words , i.e. find part of the words you know ; try clapping the separate syllables; read the whole word, then re-read the sentence and check

33、that it sounds right and makes sense.Reading and responding Find the word gravity on p11. Show children how to find the meaning in the glossary. Ask the children to start reading the book for information, choosing sections from the contents page, then skimming the page and reading it more closely. Observe each child and praise good skimming and scanning, as well as strategies for reading tricky words . Ask the children to describe and explain what they found out in one of the sections. Do they understand the expl如 如 on? Was it interesting and useful?Retur