Build a Mini Trebuchet

Here's how.

Active Time

20-30 minutes

Total Project Time

20-30 minutes

Key Concepts

Physics, engineering, potential energy, kinetic energy, conservation of energy

https://www.youtube.com/watch?v=ksG87OUZOkA

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.

Next: Materials

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