来自《耶鲁大学开放课程：基础物理 第9集 第9集》

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  You want to rotate something around some axis,
  如果你想绕着某个轴旋转物体
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  you've got a certain amount of force,
  你有一个确定大小的力
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  you're best off applying the force
  你施加的力的作用点
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  as far as you can from the point of rotation.
  离旋转轴越远越好
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  In other words,
  换句话说
• 
  
  suppose we want the rear end of this table here,
  假设我们想让桌子的背面朝这边
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  keeping this end fixed,
  固定这个点
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  but I want to turn it so it's this way.
  我想把它转一下 摆成这样
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  Then I'm saying,
  我想说的是
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  I think we all know,
  众所周知
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  we want to start pushing here.
  我们想从这里开始推
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  Also, we don't want to apply a force this way or that way,
  我们不想在这个方向或那个方向用力