Make a Mechanical Leg

Make a ball and socket joint that mimics the movement of a human hip or shoulder.

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Inspiration Video

Suggested Materials

  • cardboard
  • rubber bands
  • tennis ball
  • tape
  • scissors
  • rulers

Difficulty Level


This design challenge may require moderate motor skills, understanding of some abstract concepts, or uncommon materials to build.

Educator Resources

This design challenge has downloadable resources available.