来自《耶鲁大学开放课程：基础物理 第3集 第3集》

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  which stands for tension.
  也就是拉力的意思
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  The rope is being pulled backwards by this guy, the T.
  绳子也会被这个物体朝反向拽 拉力也是 T
• 
  
  What is the force on the other side?
  另一边有什么力呢
• 
  
  What should that be?
  应该是什么力呢
• 
  
  Who said T?
  谁说是 T
• 
  
  Why is it definitely T and not something else?
  为什么这么确定是 T 不是其它力
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  What would happen if it's something else?
  如果是其它力会是怎样
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  Well, if it was greater .
  如果拉力很大
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  It won't snap,
  绳子不会断
• 
  
  but something else will be a problem.
  不过会有其它问题
• 
  
  Not only faster,
  不只是更快
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  but what will be its acceleration?
  加速度会怎么变