assume no air resistance, when an object is projected upward
only K.E changes to PE, the total mechanical energy is conserved
咁PE 好似無take away 又無增加個object d energy
PE 算唔算係workdone?
thx
workdone 問題
2008-01-09 10:41 pm
回答 (1)
2008-01-10 12:05 am
✔ 最佳答案
PE係ｗｏｒｋｄｏｎｅwhen an object is projected upward
有ＰＥ ｇａｉｎ
ＰＥ係勢能
係ｎｅｇａｔｉｖｅ ｗｏｒｋｄｏｎｅ ｔｏ ｍｏｖｅ ａｎ ｏｂｊｅｃｔ ａｗａｙ ｆｒｏｍ ａｎｏｔｈｅｒ ｏｂｊｅｃｔ
因為宇宙入面任何兩件ｏｂｊｅｃｔｓ都有ａｔｔｒａｃｔｉｖｅ ｆｏｒｃｅ
牛頓話個ａｔｔｒａｃｔｉｖｅ ｆｏｒｃｅ ｉｎ ａｎ ｇｒａｖｉｔａｔｉｏｎａｌ ｆｉｅｌｄ係ＧＭ１Ｍ２／ｒ︿２
所以一般人係感覺唔到ＰＥ ｉｓ ｔａｋｅｎ ａｗａｙ ｏｒ ａｄｄｅｄ ｔｏ ｔｈｅ ｏｂｊｅｃｔ
收錄日期: 2021-04-19 23:02:49
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20080109000051KK01538