1. Catapult Project

2. Must have.. Base- can use a variety of items or set ups but all catapults must have a bottom base or support structure Base- can use a variety of items or set ups but all catapults must have a bottom base or support structure Lever arm- used to pull back and launch the marshmallow, must have something on lever arm to place marshmallow in Lever arm- used to pull back and launch the marshmallow, must have something on lever arm to place marshmallow in Latch- something in place so you can pull back and latch the lever arm Latch- something in place so you can pull back and latch the lever arm

3. Energy/power- must have a place for energy to come from, examples: rubber bands, springs, other kinds of materials Energy/power- must have a place for energy to come from, examples: rubber bands, springs, other kinds of materials “Stop bar”- must have a bar or some other set up that stops the lever arm so it can launch “Stop bar”- must have a bar or some other set up that stops the lever arm so it can launch

4. Must turn in… Physical Catapult Physical Catapult Conceptual model of your physical catapult Conceptual model of your physical catapult List of materials and steps to build List of materials and steps to build Writing piece composed of history and argument Writing piece composed of history and argument