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- Homework Statement
- punch a hole with a nail through a plastic card, place a spool at the end of it and suck through it. What do you observe? Why does that happen?

- Relevant Equations
- Bernoulli's equation.

After doing what the instruction did, I noticed that the card stuck to the spool, and generated the hypothesis that it was the same effect as when putting two papers together and blowing through them, the lower pressure of the faster speed of the wind makes the higher pressure outside move the two papers together, but after trying the same experiment without punching a hole I got the same result, and my teacher insisted that the "Why" part of this problem used Bernoulli, so I have two questions I need help on:

How does Bernoulli's equation apply in this problem?

How does the hole affect the problem?

How does Bernoulli's equation apply in this problem?

How does the hole affect the problem?