来自《耶鲁大学开放课程：基础物理 第3集 第3集》

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  Acceleration is the easiest thing
  加速度是这三个量中
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  to measure of these three quantities.
  最容易测量的
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  We all have a good intuitive feeling for what acceleration is.
  我们都对于加速度有一定的感觉
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  You want to test if what Newton told you is right.
  你想要检验牛顿的理论是否正确
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  You see an object in motion,
  你看到一个物体在运动
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  you find a and you give a a certain numerical value,
  你会发现它的 a 然后给 a 赋值
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  10 meters per second squared.
  10 米每秒平方
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  But that's not yet testing the equation,
  但那还不足以检验这个方程
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  because you've got to find both sides.
  因为你要得到两边的值
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  What about the mass?
  质量怎么得到
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  What's the mass of this object?
  这个物体的质量是多少
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  Anybody want to try from this section here?
  有人想试试吗