Catapult
I think the principle of the catapult perfectly demonstrates the idea of movement (translation of an elastic force into a parabola movement). My model is simple and much fun to play with.
I used approximately 250 bricks to build it and it consists of the following parts:
- The main catapult that shoots missiles towards a target, by pushing a trigger linked to an elastic band that gets released (see video); the missile is projected with a parabolic trajectory and falls down about 1.6 m away
- 5 missiles loaded onto the catapult
- A target that falls down/slides down when hit with precision
- A soldier
We had great fun trying to film a successful target hit. It really is a hit and miss situation!
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