Eggshell Inertia

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In this physics activity (page 14 of the PDF), learners gain a better understanding of how friction and mass affect objects by comparing the rotational inertia of raw and hard-boiled eggs. Although this was created as a post-visit activity for a workshop about the physics of roller coasters, it also makes an excellent stand-alone activity.

Quick Guide

Preparation Time:
5 to 10 minutes

Learning Time:
10 to 30 minutes

Estimated Materials Cost:
1 cent - $1 per student

Age Range:
Ages 11 - 14

Resource Types:
Activity, Experiment/Lab Activity


Materials List (per student)

  • Hard-Boiled Egg (Labeled “H.B.”)
  • Raw Egg (Labeled “R.E.”)
  • Newspaper (For Easy Clean-Up)


  • Physical Sciences
    • Motion and Forces
      • Newton's Laws
      • Rotation Motion
    • States of Matter
      • Solids
      • Liquids

Informal Categories

  • Food and Cooking


To use this activity, learners need to:

  • see
  • touch

Learning styles supported:

  • Involves hands-on or lab activities


Includes alignment to state and/or national standards:

This resource is part of:

Access Rights:

  • Free access


Source Collection

  • Student Workshops


  • All rights reserved, COSI Columbus, 2009