係咪free falling就代表除weight以外冇任何外力作用係object上?
有題mc: What forces are acting on a free falling object?
1. weight of the object
2. reaction of (1)
3. air resistance
A) 1 and 3
B)2 only
C)1,2 and 3
D) 1 only
請問物理free falling定義
2009-05-25 6:38 am
回答 (3)
2009-05-26 8:08 pm
Q:係咪free falling就代表除weight以外冇任何外力作用係object上?
"Free falling" means the object falls under gravity, i.e. the acceleration equals g - the acceleration due to gravity. In other words, the force acting on the object is its own weight only (Newton's secod law).
As explained above, the answer to your mc question is option D.
"Free falling" means the object falls under gravity, i.e. the acceleration equals g - the acceleration due to gravity. In other words, the force acting on the object is its own weight only (Newton's secod law).
As explained above, the answer to your mc question is option D.
2009-05-25 5:03 pm
D.
ps. "口頭"上都會話跳傘之類做free fall~ 學術上既問題會講明係"free fall"定fall freely,如果air resistance(drag force)計算既話drag coefficient就有需要比你. 因為drag coefficient係實驗做出黎既~ 呢d係關係到fluid dynamics有興趣的話可以查下^^
ps. "口頭"上都會話跳傘之類做free fall~ 學術上既問題會講明係"free fall"定fall freely,如果air resistance(drag force)計算既話drag coefficient就有需要比你. 因為drag coefficient係實驗做出黎既~ 呢d係關係到fluid dynamics有興趣的話可以查下^^
參考: mech. engineering student
2009-05-25 7:57 am
應該係A！ 係A呱！我認為A係對ge！
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