物体无加速度地，悬挂在此，合力为零，加速度亦为零。
This object is hanging there, it's not being accelerated so the net acceleration must be zero.
加速度才为零,写出来就是：我给它的力,与重力之合力等于零。
Only now is there no acceleration so I can write down that force of Walter Lewin plus the force of gravity equals zero.
地面运动加速度功率谱模型为零均值的平稳高斯过程，描述为过滤白噪声施加于支撑各点。
The power spectral density function of ground acceleration can be described as filtered white noise applied on each support point.
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