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Weekend Science: An amazing trick 週末科學: 神奇戲法
Welcome to Weekend Science! Every Friday, we're going to guide you through some cool experiments that you can do at home. It's a good idea for you to keep a record of what you do in a Science Journal. That way you can record what you learn, compare results and maybe use them to design new experiments! Have a look at the Science Journal box for some ideas to get you started. Remember to always ask a grown-up's permission before trying out an experiment.
歡迎閱讀《週末科學版》！我們每週五都要為你介紹可以在家中進行的有趣科學實驗。你可以在《科學日誌》中 記錄自己做了哪些活動，這樣就可以將所學的紀錄下來，比較這些結果，也許還可以利用它們來設計新的實驗！先看一下《科學日誌》的點子再開始吧。展開實驗之前，記得要獲得大人許可喔！
Friday, Apr 04, 2008,Page 20
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照片：MICHAEL KEARNEY
PHOTO: MICHAEL KEARNEY, TAIPEI TIMES
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This week we're looking at friction. You'll also learn a wicked trick to amaze your friends and family.
What you will need:
Two paperback books, about equal in size and over 100 pages long.
Two glossy magazines, over 200 pages thick, (fashion magazines work well).
Two glossy magazines under 100 pages thick.
▲ You'll probably want to sit at a table to do this. Take the two books and hold them so that the outer edges of the book are facing each other.
▲ Carefully interweave the pages, just like you would interweave a pack of cards. Do this carefully so that one page goes on top of the other. The neater you are the better the trick will work.
▲ When all the pages of the books are together, pick up the books by the spines.
▲ Try to pull the books apart.
▲ Now interweave the pages of the larger magazines.
▲ Pick up the magazines by the spines. Can you pull the magazines apart?
▲ Interweave the pages of the smaller magazines. Can you pull the magazines apart?
▲ Get an adult to try and help you pull apart the books. Can he or she do it? Is he or she amazed?
(CATHERINE THOMAS, STAFF WRITER)
這個星期我們要來研究摩擦力，還會教你一個可以讓親朋好友大為驚奇的酷把戲喔！
所需材料︰
兩本大小差不多、頁數超過一百頁的平裝書
兩本封面光滑、厚度超過兩百頁的雜誌（流行雜誌為佳）
兩本封面光滑、一百頁以內的雜誌
▲ 你可能要坐在桌子前進行這個實驗，拿起兩本書，並把兩本書的頁緣對靠在一起。
▲ 仔細地將兩本書的書頁交疊，就像你洗牌時那樣，仔細地將一頁疊放在另一頁上；你疊放得越整齊，把戲的效果就越好喔。
▲ 當這兩本書的書頁都結合在一起後，抓著兩本書的書脊。
▲ 試著把兩本書拉開。
▲ 接著交疊兩本較厚雜誌的書頁。
▲ 抓住兩本雜誌的書脊，你能將它們拉開嗎？
▲ 交疊兩本較薄雜誌的書頁。你能將它們拉開嗎？
▲ 請一個大人來幫你拉拉看，他或她能否將兩本書拉開呢？他或她會感到驚奇嗎？
（翻譯：袁星塵）
| VOCABULARY 今日單字 |
| 1. friction n.
摩擦力 (mo2 ca1 li4)
2. paperback adj.
平裝本的 (ping2 zhuang1 ben3 de5)
3. glossy adj.
光滑的 (guang1 hua2 de5)
4. fashion n.
時尚 (shi2 shang4)
5. interweave v.i./v.t.
使交織 (shi3 jiao1 zhi1)
6. spine n.
書脊 (shu1 ji3)
7. minimum adj.
最低限度的 (zui4 di1 xian4 du4 de5)
8. contact n.
接觸 (jie1 chu4)
9. ridged adj.
有脊狀線的 (you3 ji2 zhuang4 xian4 de5)
10. lubricant n.
潤滑劑 (run4 hua2 ji4) |
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| FURTHER IDEAS 進階點子 |
Try only interweaving half of the books. Do the books come apart? How about if you only interweave a quarter? What is the minimum amount of pages needed to keep the books stuck together? How about the magazines? Don’t forget to record your observations in your Science Journal.
試試看只把兩本書交疊半本，兩本書會分離嗎？若你只交疊四分之一本又會如何呢？兩本書最少要交疊幾頁才能緊密結合在一起呢？雜誌又如何呢？別忘了在《科學日誌》裡記下你的觀察。 |
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| Science Journal 科學日誌 |
| What do you know about friction? Try rubbing your hands together. What do you feel? This is a result of friction. What happens if you put hand cream on your hands first? Does it make a difference? Where else have you experienced friction?
你對摩擦力了解多少？試著摩擦你的手，你有什麼感覺？這就是摩擦力在作用；若你先擦護手霜再摩擦會如何？和之前有什麼不同嗎？你還曾在哪體驗過摩擦力？ |
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| Bonus 你知道嗎 |
| Oil is a lubricant. It is used to reduce the friction between two surfaces. Think about the chain on your bicycle. If there were no oil on it, then the cog and the chain would be subject to much more friction. The bike would be very hard to pedal.
油是一種潤滑劑，可以減少兩物體表面的摩擦力；想想你腳踏車上的鏈條，如果上面沒有潤滑油，齒輪和鏈條間會產生很大的摩擦力，腳踏車就不好踩了。 |
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| Next week 下週預告 |
| For next Sunday’s experiment you will need the following special items: lemons, milk, orange juice, vinegar, cotton swabs and a 100-watt (or more) light bulb.
下週日的科學實驗，需要特別準備以下的東西︰幾顆檸檬、牛奶、柳橙汁、醋、棉花棒及一顆一百瓦（或更大瓦數）的燈泡。
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