高一物理

2. 一定不会断
其实绳子受到的力只有600牛。你肯定作过这样的题目把：弹簧测力计的两端都收到五十牛的力，请问弹簧测力计的示数是多少。答案是50牛。这是个类似的问题。你试想，如果弹簧测力计的示数为50牛时，他只受一端的拉力，那不是要被哪个力拉走吗？
所以这只是一个相互作用力。当绳子两边的拉力大小都大于或等于1000牛时，绳子才会断。

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不会断啊。如果把绳子一端绑在树上，两边其实也是600N，这个力其实是相互作用而已。所以两边都拉，相当于一端绑在树上。对吧

呵呵，此题不能算难题。
选2。
把绳子当成质点，其收一对600N的平衡力，所以承受拉力仍为600N，当两边拉力增至1000N时，它就会断！