Well, the earth is going to fall towards the apple — So the force on the earth is the mass of the earth times the acceleration of the earth.

地球也会坠向苹果-，因此地球上的力与地球的质量相等，再乘以地球的加速度。

youdao

We came to the conclusion that the time that it takes for the apple to fall is independent of the mass.

结论是，苹果掉落的时间，与质量，无关。

youdao

This isn't really surprising: you expect inflation to fall in the face of mass unemployment and excess capacity.

但你不必感到惊讶：在大规模失业和生产能力过剩的大背景下，你不难想到通胀率会下跌。

youdao

That's how by either balancing the unknown force with a known force or by simply measuring the acceleration as I fall towards this podium and multiplying by mass, you can find the force that exerts on me.

我们既可以让未知力与已知力平衡,也可以只测量我冲向讲台时加速度的大小,再与我的质量相乘,都能求出作用在我身上的力的大小

耶鲁公开课 - 基础物理课程节选

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