You can experiment with different things to launch, such as Jenga, pebbles, balls, or paper balls, to see the difference.
If they have to launch the object to a far distance, what changes will they make in this?
You can challenge them to make this catapult in a bigger framework that can launch high-density objects.
Questions to be asked
Why is triangle or pyramid shape used? (Because it can't change its fundamental shape without breaking and distributes force evenly, you can show a demo of a square frame how it can change into a diamond shape)
What happens when you use more or less of rubber bands?
What differences can be seen when we try launching objects with different shapes, sizes, and density?