The rapid acceleration-deceleration forces of violent shaking can cause much more damage to brain tissue and blood vessels than a direct bump to the head caused by a short fall.

猛烈摇晃时，迅猛加快—减慢产生的力量给脑组织和血管带来的损害可能比突然跌落直接撞击头部要严重得多。

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When the head disk collision occurs, the peak acceleration of the shock pulse approximately follows a linear relationship with the inverse of the excitation duration.

当头盘系统发生碰撞时，冲击激励峰值加速度与作用时间的倒数之间具有近似线性关系。

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Acceleration brain injury is the external force on the static head, hit in the head like a brick due to skull fractures, brain damage.

加速性颅脑损伤是指外力作用于静止的头部，如砖头击中头部导致的颅骨骨折、脑损伤。

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The most important result from last time was that if you took this r, and you took two derivatives of this to find the acceleration, d^2 r over dt^2, try to do this in your head.

上节课最重要的结论,就是如果你把 r 写成这样,对 r 求两次导就能得到加速度,d^2 r / dt^2,心算一下

耶鲁公开课 - 基础物理课程节选

Researchers also found that balls inflated at higher pressure hit the head with greater acceleration, even when kicked at the same speed.

WSJ: Soccer 'Header' Impact Likened to Hard Punch

About ten minutes later, he has a 98-g acceleration to the front of his head.

NEWYORKER: Offensive Play

The commission's head honcho recently announced new actions to the Broadband Acceleration Initiative, clarifying technical provisions within the Middle Class Tax Relief and Job Creation Act of 2012 that should make mobile broadband deployment a little easier.

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