This is Not True 5 }& I: \' `9 T5 O3 oTVBNOW 含有熱門話題，最新最快電視，軟體，遊戲，電影，動漫及日常生活及興趣交流等資訊。(a) Unless you are travelling in extremely slow speed (5Km or less), otherwise your jump off speed is so slow in comparison to your forward speed. The counter 6 g$ @ f1 y: e( R: ~; i公仔箱論壇effect is not significant. OK this explain the speed aspect.TVBNOW 含有熱門話題，最新最快電視，軟體，遊戲，電影，動漫及日常生活及興趣交流等資訊。* l9 C, Y! b# d) m1 N% u
(b) Jumping direction: if you were in a car or a train carriage, you do not have a TVBNOW 含有熱門話題，最新最快電視，軟體，遊戲，電影，動漫及日常生活及興趣交流等資訊。0 ^& ?+ ]/ l. t; W1 m
choice whether you are jumping forward or backward. You can only jump iside way or best a 45 degree against the forward angle. Either angle will affect your 5 }5 R; j0 S" S
landing impact. Do not forget to Roll when the body hit the ground.9 {6 w: r0 F& g& b
(c) Make sure when you jump, you are facing the forward direction. If you are TVBNOW 含有熱門話題，最新最快電視，軟體，遊戲，電影，動漫及日常生活及興趣交流等資訊。2 P: l- |" T, m& I
facing the away direction, the forward momentum will make you fall on the back 3 q. U5 o; D4 P% E公仔箱論壇of your head first, it could be a fatal hit.tvb now,tvbnow,bttvb3 P, F4 I% y+ J, B, H( n- E; U1 m: R
This is my 2 cents worth.作者: mamasing 時間: 2007-4-25 03:31 PM
"向前跳的話，著地的時候，身體會向後仰，後腦撞到的危機性較大，死亡率亦較高"公仔箱論壇+ o1 q/ E8 x+ [
I doubt this is true. 4 Y V& v) Z: p( jIf you are carrying a forward momentum and when the body/ object landed, the: J: C- F% s# L& h
momentum will continue its direction unless affect by other external force. (Baisc - H# O- n% f0 F" i5 }* \Newton Law) ie. The body will continue to move forward, your forehead will hit 3 }! Z5 x" h2 i" C+ X$ N O v
the ground first unless you lean back when you jump off the moving object.作者: 光明的迷途 時間: 2007-4-25 09:03 PM
