We're going to ask, "What's the needle showing at different times?"

我们想要知道,"不同情况下指针的读数是多少"

耶鲁公开课 - 基础物理课程节选

But if I'm accelerating, the force exerted by the spring and therefore, the needle the weighing machine reads is m.

但是如果我在加速运动,那么弹簧的弹力,也就是称重机上指针的读数就是 m

耶鲁公开课 - 基础物理课程节选

When I was not accelerating and everything was at rest, ma was 0, w was mg, and w was the reading on the needle.

当我还没有加速,一切静止的时候,ma 是 0,w 就等于 mg,w 就是指针的读数

耶鲁公开课 - 基础物理课程节选

This spring is getting squashed on either side, and it'll squash by certain amount x, that depends on your mass, and that x will be turned into a motion of a needle and that'll read your mass.

这个弹簧两边都会受到压缩,压缩量为 x,它由你的质量决定,x 会转换成指针的运动,你从而可以读数

耶鲁公开课 - 基础物理课程节选