時速100公里的車上反方向丟時速100公里的球
很有趣是不是? 看得出為什麼會這樣嗎?
Is that it can be explained by Vectors? Two vectors with the same velocity but opposite direction.
如果用Vector去解釋,那麼那球應該會垂直彈而不會向前走吧…
Sorry,I don’t unserstand why you are saying “會垂直彈而不會向前走” now the ball is moving downward due to gravity without moving any direction.
不是呀,那球有向前走,這也是這Video要帶出的問題,為什麼理論跟事實不一樣呢?
很簡單. 因為這是現實世界既error. 理論結果同實驗結果一定100%不同,我看了尾部兩次,他是用人手發球的.那這error更大. 因為, 100km/hr=27.77m/s 所以,假設他發只早了0.1s球,vectors便不能完全cancelled out,球剩下2.77米向前移動.
這解釋合理嗎?
I can`t watch it.
网络太慢呢
可能因為電纜, 所以你看不到Youtube吧.
是不是因為那個球被發出的時候有自旋呢?
我見到那個球首先是垂直下堕, 直到著地後才滾向前的。
the ball moves downwards is due to gravity and it moves towards(opposite direction of the car) may be due to the force given by the hand of the man. is that right?
Sedona said the right point but it must count the vacuumm turbulent behind the car. So, the ball was moving to the car. Is right?
着地後向前滾（車移動的方向），是因為汽車帶動了附近的空氣，氣流推動那個球向前滾。
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December 1st, 2006 at 12:03 am
Is that it can be explained by Vectors?
Two vectors with the same velocity but opposite direction.
December 1st, 2006 at 12:10 am
如果用Vector去解釋,那麼那球應該會垂直彈而不會向前走吧…
December 1st, 2006 at 11:06 pm
Sorry,I don’t unserstand why you are saying “會垂直彈而不會向前走”
now the ball is moving downward due to gravity without moving any direction.
December 2nd, 2006 at 12:27 am
不是呀,那球有向前走,這也是這Video要帶出的問題,為什麼理論跟事實不一樣呢?
December 2nd, 2006 at 1:32 am
很簡單.
因為這是現實世界既error. 理論結果同實驗結果一定100%不同,我看了尾部兩次,他是用人手發球的.那這error更大.
因為, 100km/hr=27.77m/s
所以,假設他發只早了0.1s球,vectors便不能完全cancelled out,球剩下2.77米向前移動.
這解釋合理嗎?
January 5th, 2007 at 3:42 am
I can`t watch it.
January 5th, 2007 at 3:46 am
网络太慢呢
January 5th, 2007 at 4:19 am
可能因為電纜, 所以你看不到Youtube吧.
January 7th, 2007 at 7:04 am
是不是因為那個球被發出的時候有自旋呢?
我見到那個球首先是垂直下堕, 直到著地後才滾向前的。
January 27th, 2007 at 7:47 pm
the ball moves downwards is due to gravity and it moves towards(opposite direction of the car) may be due to the force given by the hand of the man. is that right?
May 16th, 2007 at 8:17 am
Sedona said the right point but it must count the vacuumm turbulent behind the car.
So, the ball was moving to the car. Is right?
July 16th, 2007 at 6:49 pm
着地後向前滾（車移動的方向），是因為汽車帶動了附近的空氣，氣流推動那個球向前滾。