# Minimum necessary speed for card to be able destroy glass

## Homework Statement

Hello, I am international student, so sorry for possible mistakes in English. For our science night I naively choosed project, where I will try to calculate minimal necessary speed for thrown card to destroy glass (probably wine glass). There are two videos for illustration.

and

My physics teacher said that it is great idea, but he does not know, how to calculate it. We were thinking about it and the most important factors will be probably:

1. Speed of the card (changing variable and our goal for calculating minimal necessary)
2. Weight of the card, area of edge of the card, strength of the card
3. Strength of the glass

At first I should calculate theoretically, how big speed is necessary for that, and then try if human is really able to make this speed with playing card Bicycle. Or I can try calculate it for credit card or any other stronger type of card.

## Homework Equations

I absolutely do not know, where should I start. I was searching some help on google and than I got here on article discussing bullet going through heads. I found it similar to my topic.
So my questions are:

Where should I start my research or what terms I should look on?
Is it possible to calculate it at all?
I am sure that no one in history calculated possible destruction of cards. Could I inspire in boomerang and ninja stars experiments? Or in shooted bullet going through various stuff?

3. The Attempt at a Solution

We were thinking about it and the most important factors will be probably:

1. Speed of the card (changing variable and our goal for calculating minimal necessary)
2. Weight of the card, area of edge of the card, strength of the card
3. Strength of the glass

Similar technique to boomerang and ninja star throwing.