Build a LEGO Trebuchet With Wheels As Counterweights: a Fun Engineering Project

Are you ready to mix creativity with engineering in a fun way? Building a LEGO trebuchet using wheels as counterweights is a fantastic way to explore mechanics and physics while having a great time! Follow this guide to create your own LEGO trebuchet.

LEGO Building Parts:

1. Various LEGO bricks (for the base and arm)
2. LEGO wheels (to act as the counterweights)
3. A small container or LEGO piece (for the projectile)

1. Construct a sturdy base using larger LEGO blocks. Ensure it’s wide enough to prevent tipping during launches.

1. Use a long LEGO piece for the arm. Attach one end to the base with a pivot point made from a round LEGO brick or a hinge piece, allowing it to swing freely.

1. Attach LEGO wheels to the opposite end of the arm. Stack several wheels to create enough weight for effective launching. Secure them to prevent falling off.

Attach the String

1. If you have a LEGO string piece or a thin rubber band, attach it to the arm. Connect it to a small container or LEGO piece that will hold the projectile.

1. Place a small LEGO piece in the container at the end of the arm. Ensure it’s secure to avoid it falling out before launch.

1. Pull down the arm to load the trebuchet. When you release it, the wheels will drop, converting potential energy into kinetic energy, launching your projectile! Experiment with different weights and angles to see how they affect launch distance.

When you release the arm, the counterweights (the LEGO wheels) drop, transforming their potential energy into kinetic energy. This causes the arm to swing upward rapidly, launching the projectile in a curved path, which follows the principles of projectile motion. Your LEGO trebuchet design helps maximize the distance traveled based on launch angle and speed.

Building a LEGO trebuchet with wheels as counterweights is not only enjoyable but also a great way to teach kids about engineering and physics through play. Encourage experimentation with different designs, weights, and angles to see how they affect launch distance.