The Egg Drop Challenge: Minimizing Collision Forces

Part 1: Engage (Anchoring Phenomenon)

Imagine you are part of a team designing a new landing capsule for a space probe. The probe contains sensitive scientific instruments that will shatter if they experience an impact force greater than 50 Newtons. Your probe will be descending at high speeds, and you must design a “crash cushion” to ensure its survival upon impact.

Initial Reflections:

  1. Why does an object break when it hits a hard surface?
  2. What are some real-world materials or devices used to prevent things from breaking during a collision?
  3. Generate two “need to know” questions about how to reduce the force of impact.

Part 2: Explore (Simulation Investigation)

Open the Collision Force Minimizer Simulation and prepare to test different engineering designs.

Static Payload Test

Set the Payload Mass to 0.1 kg and the Drop Height to 5.0 m. Conduct four trials, one for each material type, while keeping the Cushion Thickness at 0.2 m.

Trial Material Peak Force (N) Max Compression (m) Status (Survived/Broken)
1 Airbag      
2 Foam      
3 Rubber      
4 Concrete      

The “Bottoming Out” Variable

Reset the simulation. Keep the material as Foam, the mass at 0.1 kg, and the height at 10.0 m. Test the effect of thickness.

Thickness (m) Peak Force (N) Max Compression (m) Observation
0.50      
0.10      
0.05      

Part 3: Explain (Sensemaking)

  1. Analyze the Data: Based on your first table, which material was the most effective at minimizing the peak force? Why do you think “softer” materials (lower k value) result in lower forces?
  2. Interpret the Force Profile: Look at the “Force Profile Over Time” graph after a survived drop. Describe the shape of the curve. How does the time of the impact relate to the peak force experienced?
  3. The “Bottoming Out” Effect: What happened when the cushion thickness was less than the max compression required to stop the egg? Explain this using the concept of energy and stopping distance.

Part 4: Elaborate/Evaluate (Argumentation & Refinement)

The Heavy Payload Challenge

Your mission is to protect a heavy payload of 1.0 kg dropped from the maximum height of 10.0 m.

Design Constraints:

Refinement Task:

  1. Experiment with different material and thickness combinations.
  2. Record your final successful design parameters:
    • Material:
    • Thickness (m):
    • Resulting Peak Force (N):
  3. Scientific Argument: Construct a claim-evidence-reasoning (CER) statement explaining why your specific design was able to keep the payload safe while others failed. Use terms like momentum change, impulse, and stopping distance in your reasoning.