Question

高一物理

一条轻绳承受的拉力达到1000N是就会拉断，若用此绳进行拔河比赛，两边的拉力大小都是600N，则绳子（）
1. 一定会断
2. 一定不会断
3. 可能断，可能不断
4. 只要绳子两边的拉力相等，不管拉力多大，合力总为0，绳子永远不会断

详细的分析解题过程 好的会追加分的

Answer 1

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。

Answer 2

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Answer 3

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

Answer 4

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！

Answer 5

一定不会断的。1000牛指的是相互作用力为1000，只有在相互作用力大于1000才可以 拉断

Answer 6

4