一樣10N object 如果向下move 1m ,向上move 1m
雖displacement 是0
咁係咪應該咁諗
work done when moving up= mgh = 10J
work done when moving down = mgh =10J
Total work done = 2 mgh =20J
咁係咪即係FS 個 S 不等於net displacement
如果好似呢個case 就要分開兩個motion 去計
THX~~
收錄日期: 2021-04-20 18:38:55
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20071219000051KK02525