睇d參考書同教科書,畫Free-body diagram果時有d畫埋air friction,有d就冇既,點解呢?
如果條問題要我畫Free-body diagram,個答案冇air friction但我畫左咁會唔會冇分架??
Free-body diagram
2008-03-17 4:25 am
回答 (1)
2008-03-17 6:14 am
✔ 最佳答案
air resistance can be negligible or can be taken into account.you should pay attention to the question.
just like force of gravity, it is about 9.8, but we can make it 10.
收錄日期: 2021-04-29 20:28:12
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