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Most of us will have done this at some point. grap a straw and a potatoe, quickly stab the potatoe (apple, tomatoe...) with the straw and it goes through the potatoe. But why and how does this happen? Why does the straw not just bend on impact?
You forgot to say that you have to close the other end of the straw with your thumb. If you don't close it, the straw will deform badly without doing anything to the potato. That is the amazing part of the experiment!
Quote from: lightarrow on 11/09/2007 15:43:49You forgot to say that you have to close the other end of the straw with your thumb. If you don't close it, the straw will deform badly without doing anything to the potato. That is the amazing part of the experiment!Dearest Lightarrow. I am prepared to be shot down in flames and go to hell for eternity, but i have to disagree. You do not need to put your thumb over the end of the straw for it to work, if you did then the simple answer would be airpressure.I have done this many times, even this morning with some old apples. And i never put my thumb over the end of the straw, yet it still works. I was always told about it being air pressure, but seeing as it works without the thumb on the end it surely can not be.But you are right when you say it is amazing, as it is. I may get Anastasia to do this at the weekend and post a video on youtube, to show it without the thumb on the end.Looks up to the sky for impending thunderbolt.
We have always used a plastic drinking straw! What is a natural vegetable straw?I like Alberto have had the same problem with the straw if the top hole was not covered. My straw gets all mangled LOL.. Am I holding it wrong??? Now I am curious as to why I cannot penetrate the potato without covering the end. We have done this many times as I grew up as well as with the children at school.. I am baffled.. I want to learn the new way too!
How do you hold the straw? Around the middle?
Quote from: Karen W. on 12/09/2007 16:54:52How do you hold the straw? Around the middle?or near the end. just like you would a knife stabbing at a ....something
If you take a straw and hit most any object that is somewhat soft, or not completely solid, you can the straw to go into it. The idea is that you will be hitting the object at the correct angle that the straw itself will be perfectly aligned to be incredibly strong. If you hit it at an angle other than exactly straight the straw will bend and become relatively weak. Sorry fi that sounded unprofessional but it makes sense.I remember when i was growing up in the midwest of the United States, where tornados are very previlent, that after a storm had blown through the town I lived in, someone came across a straw stuck about an inch into the side of a tree. I found it unbelievable, but you can imagine with such strong force and the correct angle it was easy for the straw to penetrate the tree.The picture isn't very clear, but it proves my point