This is Not True5.39.217.76 W) \7 `+ O7 s% i
(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 % G3 r: Y& V$ D% }. R. H& [& W
effect is not significant. OK this explain the speed aspect.公仔箱論壇$ e* ]9 V2 C+ z) p7 f- J5 O8 g4 l
(b) Jumping direction: if you were in a car or a train carriage, you do not have a 5.39.217.76. G) S, D& \% T( @) O
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 & h* X& a! b- V% Olanding impact. Do not forget to Roll when the body hit the ground. % r4 n- ]# `, Q+ y(c) Make sure when you jump, you are facing the forward direction. If you are , Y) Q: Y- I2 M% ^. L2 Vfacing the away direction, the forward momentum will make you fall on the back 5.39.217.76+ x3 Q& T y2 {+ _
of your head first, it could be a fatal hit. H/ G8 V1 ]8 e3 ^
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" 3 h4 j7 n4 s6 e8 t- z1 T+ Q) YI doubt this is true. - i3 E: k$ S* |2 \If you are carrying a forward momentum and when the body/ object landed, the : Z0 S8 k, Z2 htvb now,tvbnow,bttvbmomentum will continue its direction unless affect by other external force. (Baisc2 ]3 h% i% o" T
Newton Law) ie. The body will continue to move forward, your forehead will hit : s& K" G# \# U+ A6 x7 U
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
