A trebuchet has a lever arm with a large, heavy counterweight on one end and a smaller projectile on the other end. It relies on gravitational potential energy-the type of energy you get by raising something up off the ground. This catapult worked by storing elastic potential energy-the type of energy you get from stretching something such as a rubber band or a spring-and rapidly converting it to kinetic energy (the energy of motion) of a projectile (in that case a cotton ball).Ī trebuchet works differently. The Bring Science Home activity Build a Catapult showed you how to build a miniature catapult out of popsicle sticks and rubber bands. But did you know about an even bigger type of medieval siege weapon called a trebuchet? Try this project to build a miniature version! In the Middle Ages armies would use them to hurl stones at castle walls.
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