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標題: I.S. Question [打印本頁]

作者: Hugo 時間: 19/4/2004 08:58 PM
標題: I.S. Question
When a student throws a ball up, it loses
A. Kinetic energy
B. Potential energy
C. Heat energy
D. Chemical energy

Which one is correct?

作者: rogergeot 時間: 19/4/2004 09:20 PM
A. (I think. ) You should ask some other guys as I do not study science.

作者: 細薯 時間: 19/4/2004 09:35 PM

Originally posted by rogergeot at 2004-4-19 09:20 PM:
A. (I think. ) You should ask some other guys as I do not study science.

B ar~~be coz origanally it have many potential energy to be dropped to the floor...but u throw it to the opposite direction of floor.......so lose potential energy.......one thing to say.....this question study at form2 ga bo......I S is ALL ppl have to study ga bo.....do not study science also must study I.S.....

作者: rogergeot 時間: 19/4/2004 09:55 PM
First of all, I do not like science. And secondly, I am weak at Science. This is why I do not prefer people asking me science questions.

作者: 霏 時間: 19/4/2004 09:56 PM

Originally posted by smallpotato226 at 2004-4-19 09:35 PM:
B ar~~be coz origanally it have many potential energy to be dropped to the floor...but u throw it to the opposite direction of floor.......so lose potential energy.......one thing to say.....this q ...

ｎｏ
Ｐｏｔｅｎｔｉａｌ　Ｅｎｅｒｇｙ　係ｓｔｏｒｅｄ　ａｔ　ａ　ｈｉｇｈ　ｐｏｉｓｔｉｏｎ〔所以Ｐ．Ｅ．係ｇａｉｎｓ唔係ｌｏｓｅｓ〕
Ｂｙ　ｃｏｎｓｅｒｖａｔｉｏｎ　ｏｆ　Ｅｎｅｒｇｙ（唔使理），Ｋｉｎｅｔｉｃ　Ｅｎｅｒｇｙ會減少ｉｆ　ｐｏｔｅｎｔｉａｌ　Ｅｎｅｒｇｙ　増加

Ｓｏ　Ａ

作者: 細薯 時間: 19/4/2004 10:05 PM

Originally posted by 幻將 at 2004-4-19 09:56 PM:
ｎｏ
Ｐｏｔｅｎｔｉａｌ　Ｅｎｅｒｇｙ　係ｓｔｏｒｅｄ　ａｔ　ａ　ｈｉｇｈ　ｐｏｉｓｔｉｏｎ〔所以Ｐ．Ｅ．係ｇａｉｎｓ唔係ｌｏｓｅｓ〕
Ｂｙ　ｃｏｎｓｅｒｖａｔｉｏｎ　ｏｆ　Ｅｎｅｒｇｙ（唔使理）， ...

相對ga.......i maybe forgotten the things that have learnt last year......(form2 I.S.)

作者: oscar 時間: 19/4/2004 11:03 PM
補充:
這個motion的energy change係Kinetic Energy---&gt

otential Energy，話明轉緊個energy，所以前一個energy decreases，下一個energy先會出現。
如果fall down既時候，potentail energy則decreases，kinetic energy增加直至到達ground。

這是Form1 Integrated Science，不是Form2的~可能改左版~(我今年Form2，上年先教完黎~)

作者: 細薯 時間: 21/4/2004 01:00 PM

Originally posted by oscar at 2004-4-19 11:03 PM:
補充:
這個motion的energy change係Kinetic Energy---&gtotential Energy，話明轉緊個energy，所以前一個energy decreases，下一個energy先會出現。
如果fall down既時候，potentail energy則decreases，kine ...

sorry~~弄亂了.......

作者: 小卡 時間: 22/4/2004 09:32 PM
B. Potential energy
當你吹脹氣球o個陣時,你作緊既動作係動能,而氣球表面是勢能。當你放開既時候,姐係由動能轉勢能、所以應該就係勢力.我唔sure ga.....

作者: rogergeot 時間: 22/4/2004 10:05 PM

Originally posted by 鷹宮小卡 at 2004-4-22 09:32 PM:
B. Potential energy
當你吹脹氣球o個陣時,你作緊既動作係動能,而氣球表面是勢能。當你放開既時候,姐係由動能轉勢能、所以應該就係勢力.我唔sure ga.....

I think you have misinterpeted the question. You should read carefully what Hugo has said.

作者: 神秘比卡超 時間: 23/4/2004 10:25 AM
我也覺得是A。
throw的動作含 A. Kinetic energy
throw後，氣球才產生 B. Potential energy
這裡不包含 C. Heat energy
沒有出現 D. Chemical energy

作者: 大明 時間: 23/4/2004 06:37 PM
Chemical energy大概意思係咩?
唔該

作者: 神秘比卡超 時間: 23/4/2004 07:35 PM

Originally posted by 大明 at 23-4-2004 06:37 PM:
Chemical energy大概意思係咩?
唔該

也許是化學能量...
電芯有Chemical energy,食物也有。
Chemical energy可以轉化成其他form的energy。

作者: 霏 時間: 24/4/2004 12:32 PM

Originally posted by 神秘比卡超 at 2004-4-23 10:25 AM:
我也覺得是A。
throw的動作含 A. Kinetic energy
throw後，氣球才產生 B. Potential energy
這裡不包含 C. Heat energy
沒有出現 D. Chemical energy

問題係掉高個Ｂａｌｌ，個波與地面的距離增加，地心吸力對波的作用増加，即係位能增加
由於位能增加，即意味著動能下降
你說對了

作者: 細薯 時間: 24/4/2004 12:54 PM

Originally posted by 幻將 at 2004-4-24 12:32 PM:
問題係掉高個Ｂａｌｌ，個波與地面的距離增加，地心吸力對波的作用増加，即係位能增加
由於位能增加，即意味著動能下降
你說對了

意味著動能下降.....不是很對...本身地心吸力把它向下拉....你把它向上拋....互相抵消jor......so 動能下降......ng關位能事.......只是位能和動能一個上升...一個下降....令你產生錯誤的因果關係~~

作者: 霏 時間: 24/4/2004 04:54 PM

Originally posted by smallpotato226 at 2004-4-24 12:54 PM:
意味著動能下降.....不是很對...本身地心吸力把它向下拉....你把它向上拋....互相抵消jor......so 動能下降......ng關位能事.......只是位能和動能一個上升...一個下降....令你產生錯誤的因果關係~~

你知唔知乜野係位能？？

位能－－＞公式：ｍｇｈ
　　　　　　　　
　　　　　　ｍ：ｍａｓｓ　ｇ：ｇｒａｖｉｔｙ　ｈ：ｈｅｉｇｈｔ

位能同ＫＥ同ＰＥ係有關，但係ＰＥ同Ｇｒａｖｉｔｙ〔地心吸力〕的關係更密切。
〔呢Ｄ都係Ｆｏｒｍ３卅４（理科物理）學ｇａｒ〕　

作者: <3~CathY 時間: 30/4/2004 10:31 PM
First kenitc energy,then change to Potential energy

作者: Hugo 時間: 1/5/2004 11:08 PM
標題: The answer
My teacher has told me the answer.
The answer is A.Kinetic Energy.

作者: 細薯 時間: 2/5/2004 09:23 AM

Originally posted by Hugo at 2004-5-1 11:08 PM:
My teacher has told me the answer.
The answer is A.Kinetic Energy.

知哂la wo 我地........is that??

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