How does strength affect where serrated toilet paper pieces tear?

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Assuming toilet paper with square(ish) serrated pieces, how does the strength of someone’s pull affect which serrated edge gets torn?

In: Physics

If I pull Saïd square directly in the middle, there’s a possibility that it will not break on the line and just tear weird. It all depends on which side you come from, left side tears from the right first and vice versa. Doesn’t really matter strength, except you may pull so hard you fall backwards!