Center of Gravity

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A simple, yet fun activity that lets learners find the center of balance of a ruler (or any long thin object). Developed by the Exploratorium and no assembly needed.

Quick Guide

Preparation Time:
Under 5 minutes

Learning Time:
Under 5 minutes

Estimated Materials Cost:
1 cent - $1 per student

Age Range:
Ages 4 - adult

Resource Types:
Activity, Demonstration


Materials List (per student)

  • Yardstick, meter stick, cane, broomstick, PVC pipe, or any stick of a similar general size
  • Clay or other weight
  • Masking tape


  • Physical Sciences
    • Motion and Forces
      • Gravity
      • Center of Gravity


This resource is part of:

Access Rights:

  • Free access



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