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136618 2006 年 12 月 19 日 04:11 Reading (loading. ..) Comments (2) Category: Miscellaneous world Kan
Dalian Heavy snow today, the question the way in back to school.
Scene: Under the snow, the pedestrians on the road in twos and threes, the golden lights shining path of white exudes a touch of heat. A couple into the line of sight, I walked, the girl sat back without warning to the ground (no endorsement package), issued a muffled bang.
boys:
Soon,
new balance mens, they came behind the same muffled, a look back, another girl, also a back sitting on the ground.
Why not move?
fellow classmates asked me back:
I certainly will not believe this is because girls ass Shen will fall back, but what is why? Everyone should know: the foot forward, backward force, the friction of land to the foot forward,
离开，悄无声息, when the friction is static friction, foot stuck in situ. Then foot and then drive the rest of the body to move forward. In the process of people moving forward, the friction in the land to the foot has been a forward, so it stands to reason that the local is very slippery, the friction is less than other parts of the foot to drive the body, so people should move forward down, right?
but why people are always walking in the snow, then back down ... ...
Then I carefully studied the
look,
路边蹲一狼 - Qzone日志, probably figured out that reason, and now live about the process of landing the girl ass:
snow, the girl is very careful walking on the road, flanked by her boyfriend, be sure to keep the image of lady, so small that the steps she
Attention! Her right foot a small step forward.
Rated: At this point the girl left the ground the whole foot, right foot heel, right foot has a forward acceleration.
Play: Girls sliding right foot with a sudden!
kinetic analysis at this time: f = ma because of right foot forward acceleration a, while the girl is not the case right foot ghost mass m is not 0, so there is a right foot forward on the ground force f, the Newton's law that one, to be on the girl's right foot has a friction back. Do not forget,
new balance 574, this time the snow surface, the friction coefficient is small, the girl right foot forward is greater than the static friction of the ground can give!
Play (girl's psychological): the girl suddenly found the right foot with a slide! Psychological panic, can not fall down, ah, so the subconscious part of the body quickly mobilize quickly to his right foot with the rushed, that is wishful thinking forward to continuing to move forward!
Rated: girl's center of gravity forward and landed on the right foot sliding forward, while the left foot forward too,
new balance outlet!
Play: right foot is still moving forward, the girl's left foot was already off the ground, so the girls contact with the ground only that the right foot moves forward, the girl has no strength left to their own feet down to the ground by (and response, but to), and finally,
new balance running shoes, the girl chosen, Oh, sat on the floor!
not know if I explained that right, I thought it was to come up with the answer, sometimes boys fall,
保护脸的好办法 ―偷师哈 - Qzone日志,
new balance shoes, but most of the time found that his right foot slides forward when the boys carried out the left foot but did not Choose the right foot hard down quickly, increasing the friction of the foot leaving the ground friction coefficient increases, eventually the right foot to stop sliding. Or in the ground at that time left leg to keep the body stable Tazhu lift his right foot step back, arms and back while doing backward circular motion forward to offset the acceleration of the body,
new balance sneakers!
Schools to provide students with summer around the
Linear Mode
