Class 3 Catapult

Project Snapshot

A class 3 lever puts the load on one end, the fulcrum on the other, and the effort somewhere in between.

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This project illustrates this fundamental tool while also delivering some high-flying projectiles!

Click to expand

Tools and Materials

The Engineering Creation Kit has everything you need for this project and many more from STEM Inventions, or get the supplies in bulk:

• Hot glue gun

• Glue sticks

• Masking tape

• Craft sticks

• 3-1/2" rubber bands

• 1/2" craft cubes

• Cubes with holes

• Plastic portion cup

• Tool to cut or break craft sticks

Tips and Troubleshooting

If the hinge is breaking or falling out of the cubes, then...

• Just use 1 rubber band. 2 or more may put too much strain on the dowel

• Make the dowel slightly longer so it can't fall out from between the cubes with holes