The shutter is designed as a mass-spring system that moves in response to acceleration force.

光闸设计为一个质量弹簧系统，对加速度力产生响应。

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Objective: To observe on linear acceleration force on the traumatic changes of the brain, especially on the evolution of the diffuse axonal injury (DAI) in cats.

目的：为了解直线加速度在颅脑损伤特别是在弥漫性轴突损伤（DAI）中的作用。

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Acceleration and wheel force safety limits.

加速和车轮力安全限制。

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Now, gravity, well force, is equal to mass times acceleration, g and the acceleration due to gravity is g.

是重力，等于质量乘以加速度，由重力导致的加速度是。

麻省理工公开课 - 热力学与动力学课程节选

So, a massless body cannot have a net force on it, because the acceleration of the rope cannot be infinite.

所以没有质量的物体不会受到力,因为绳子的加速度不可能是无穷大

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It says that, "If a body has an acceleration, then you need a force and the relation of the force to acceleration is this thing."

它是这么说的,"如果一个物体有加速度,那么你需要有一个力,力和加速度的关系是这样的"

耶鲁公开课 - 基础物理课程节选

Given the rapid acceleration of technological development, any system that relies on a small, elite force of highly trained government agents may be doomed to failure.

CNN: How technology makes us vulnerable