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Forces on a constrained party balloon 
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#1
Apr2612, 07:22 AM

P: 3

Hi, A party balloon is glued onto an straw. The user inflates the balloon by blowing through the straw. However, the balloon is constrained due the presence of a rigid wall just beyond it (causing the balloon to expand upwards or backwards towards the person inflating it!). I would like to know if it is possible to estimate the forces between the balloon and the straw (at the point of gluing).
Strange question, I know. 


#2
Apr2612, 10:57 AM

P: 147

I'd start by knowing the PSI. then I would find the area of the bonded contact surface in square inches.
Then I would divide PSI by square inches to get pounds. That number in pounds would be the force. Just a guess. 


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