trebuchet23This experiment is for Advanced Students. For ages, people have been hurling rocks, sticks, and other objects through the air. The trebuchet came around during the Middle Ages as a way to break through the massive defenses of castles and cities. It’s basically a gigantic sling that uses a lever arm to quickly speed up the rocks before letting go. A trebuchet is typically more accurate than a catapult, and won’t knock your kid’s teeth out while they try to load it.

Trebuchets are really levers in action. You’ll find a fulcrum carefully positioned so that a small motion near the weight transforms into a huge swinging motion near the sling. Some mis-named trebuchets are really ‘torsion engines’, and you can tell the difference because the torsion engine uses the energy stored in twisted rope or twine (or animal sinew) to launch objects, whereas true trebuchets use heavy counterweights.

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15 Responses to “Trebuchet”

  1. Ingrid Cordano says:

    It won’t load! 🙁

  2. Angela Richens says:

    wow! i want the movie now!

  3. Jason Elbaum says:

    It’s okay now but that sort of thing keeps happening to me today on e-science.

  4. Jason Elbaum says:

    It’s completely stuck!

  5. The trebuchet instructions are on the video on this page. We only have instructions for this project on e-Science (it’s not on any DVDs), and the documentation (worksheet) link is right under the video.

  6. Hi, I purchased this kit some time ago but have lost the instructions. Is it possible to obtain another copy? Or, we have a number of your project DVD’s that might contain the instructions; I am just not sure which one the instructions might be on. Thank-you

  7. Did you get it to work through til the end? Sometimes the internet cyber-monkeys like to throw a wrench in things. 🙂

  8. Jason Elbaum says:

    The video stopped and I had to go back a little.

  9. Christine Yates says:

    looks cool

  10. Alice Denney says:

    Haven’t built it yet but have all the supplies. Looks Fun!

  11. Sheila Jakobsen says:

    I made a trebuchet at my enginering class and we made ours much bigger and we used card board and it worked the same way but how do they work and what do you think are the differences

  12. Suzanne and Charlie says:

    Wow! This project turned out perfect!! The kids are chucking marshmallows all over the room (we made two of these) and we also made forts out of bedsheets to go with it. Thanks for such a fun project!!

  13. Soon… I promise. The honest truth is that I whacked the camera during the final stages of testing and it had to be sent off to the repair shop. It just arrived back today and we’ll have to see how much of the video was recovered. So sorry for the delay!

  14. Susan Rothermel says:

    When will the movie go up?