Class 3 Catapult
A class 3 lever puts the load on one end, the fulcrum on the other, and the effort somewhere in between.
This project illustrates this fundamental tool while also delivering some high-flying projectiles!
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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