How can I protect an egg from cracking with limited materials?

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Discussion Overview

The discussion revolves around designing a protective structure for an egg to prevent it from cracking when dropped from a height of 3 meters, using only specified materials: rubber bands, paper, scotch tape, and string. The focus is on exploring various construction ideas and principles related to impact protection.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested
  • Homework-related

Main Points Raised

  • One participant asks for clarification on the specifics of the drop, including orientation and height, suggesting that these factors influence the design approach.
  • Another participant mentions the importance of reducing the maximum force on the egg by decreasing the rate of deceleration upon impact, referencing the concept of "crumple zones" in cars.
  • A suggestion is made to use four sheets of paper to create a parachute canopy and one sheet as a crumple pad, although the effectiveness of this idea is uncertain.
  • Participants discuss the potential benefits of a parachute in slowing the descent and propose exploring various geometric structures that could be constructed with the available materials to cushion the fall.

Areas of Agreement / Disagreement

Participants generally agree on the need to cushion the egg's fall and explore various construction methods, but there is no consensus on the best approach or specific designs. Multiple competing ideas and suggestions are presented without resolution.

Contextual Notes

The discussion does not address specific assumptions about the egg's weight or the exact mechanics of the drop, which may influence the effectiveness of proposed designs.

Who May Find This Useful

This discussion may be useful for students or individuals interested in engineering design challenges, physics principles related to impact forces, and creative problem-solving with limited resources.

pandabento09
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Hey Guys,

I know that this has been posted before, but mine is slightly different.

Our instructor only provides:

5 medium rubber bands
5 sheets of 8.5 X 11 paper
20 inches of scotch tape
20 inches of string

We can only use the materials he provides us.

Can you please give me ideas for helping me constructing a protection for the egg from cracking?
 
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What have you learned by reading back over the old PF threads about this project?
 
Depends on how you have to protect the egg. Is it dropping always in the same orientation? Do you need to protect it so it can be dropped from any orientation? ie: Dropping it from 2 inches is a different solution than from 6 feet. Dropping it on its side has different constraints than dropping it if it were tumbling (either slowly or quickly)

What are the specifics of the problem you need to solve?
 
we're droping it from 3 meters.
 
You are trying to reduce the maximum force on the egg. since F = m a, you do this by reducing the rate of deceleration, that is make the egg stop more slowly when it hits the ground.

You might want to look up "crumple zones" in cars.
 
pandabento09 said:
5 medium rubber bands
5 sheets of 8.5 X 11 paper
20 inches of scotch tape
20 inches of string

One thought would be to use 4 of the sheets for a parachute canopy (held open by you at release), and the other sheet for a crumple pad thing taped underneath. Wonder if that would work... (walking off to mock one up...)
 
A parachute could definitely help you land so that the egg stays on top of whatever you use to cushion the fall.

I imagine there are several ways to build the cushions. Looking at an egg crate from the store might give you some ideas. Think about the geometrical structures you can build with paper and tape (cylinders, cones, pyramids, whatever) and how you might use them to build something that will cushion the fall.
 

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