Best Egg Drop Contest Shock Absorber?

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The discussion focuses on a grade 7 student's egg drop project utilizing shock-absorbent materials like cardboard, styrofoam, and sponges. The student seeks assistance in understanding the physics of shock absorbency and creating a free body diagram. Participants encourage the student to explore existing designs and research shock-absorbing devices for inspiration. Additionally, they inquire about the specific rules of the contest to provide more tailored advice. Overall, the thread emphasizes the importance of research and understanding the underlying physics for successful project design.
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TL;DR Summary: egg drop report

i have an egg drop report, and my contraption is based off of shock absorbant materials (cardboard, styrofoam, and sponges). idk how to draw a free body diagram about this, or the physics behind shock absorbency. can someone help me please? (grade7)
 
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Welcome to PF. :smile:

What reading have you done so far on this project? What shock absorbing devices have you found in a Google Images search for such contests? Do they give you some ideas?

What are the contest rules?
 
Thread 'Chain falling out of a horizontal tube onto a table'

Thread 'Chain falling out of a horizontal tube onto a table'

My attempt: Initial total M.E = PE of hanging part + PE of part of chain in the tube. I've considered the table as to be at zero of PE. PE of hanging part = ##\frac{1}{2} \frac{m}{l}gh^{2}##. PE of part in the tube = ##\frac{m}{l}(l - h)gh##. Final ME = ##\frac{1}{2}\frac{m}{l}gh^{2}## + ##\frac{1}{2}\frac{m}{l}hv^{2}##. Since Initial ME = Final ME. Therefore, ##\frac{1}{2}\frac{m}{l}hv^{2}## = ##\frac{m}{l}(l-h)gh##. Solving this gives: ## v = \sqrt{2g(l-h)}##. But the answer in the book...
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