Why is it difficult to take out the tissue when it is running out? What principle! ?

When there are too many paper towels, the friction between the pumped paper and the adjacent paper is far less than the gravity of the remaining paper, so it is easy to separate (extract); When there are few paper towels, the friction between the pumped paper and the adjacent paper is greater than or equal to the gravity of the remaining paper, so it is not easy to separate (extract). At this time, you can take the method of pulling up the paper towel quickly.

Hope to adopt!