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Active Time
20-30 minutes
Total Project Time
20-30 minutes
Key Concepts
Physics, engineering, potential energy, kinetic energy, conservation of energy

Introduction

You probably know what a catapult is. In the Middle Ages armies would use them to hurl stones at castle walls. But did you know about an even bigger type of medieval siege weapon called a trebuchet? Try this project to build a miniature version!

Credits

Ben Finio, PhD, Science Buddies
This activity is not appropriate for use as a science fair project. Good science fair projects have a stronger focus on controlling variables, taking accurate measurements, and analyzing data. To find a science fair project that is just right for you, browse our library of over 1,200 Science Fair Project Ideas or use the Topic Selection Wizard to get a personalized project recommendation.

Materials

  • Piece of corrugated cardboard, about one foot by one foot
  • Popsicle sticks (8)
  • Scissors
  • Pencil
  • Jumbo or "milk shake" straw
  • Glue (a hot glue gun is best if available, but use caution and adult assistance when using hot glue.)
  • Tape
  • Rubber bands
  • String
  • Paper clip
  • AA battery
    Materials to build the mini trebuchet

Reviews

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Active Time
20-30 minutes
Total Project Time
20-30 minutes
Key Concepts
Physics, engineering, potential energy, kinetic energy, conservation of energy
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