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Two children wish to break a string. Are they more likely to succeed if each takes one end of the string and they pull against each other, or if they tie one end of the string to a tree and both pull on the free end? Why?

I answered this one yesterday.

You get the same tension by pulling with a force with one end tied to something, as you would with two people pulling at each end with the same force.

Whether it breaks or not depends upon the tension in the string, not how many people are pulling on either end.

Reason? Newton's Third law.

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