I looked at many designs of catapult for inspiration, and decided to use one of them as my tutorial. I’ll follow the steps and change the details while I am building it. The materials I will use are popsicle sticks, water bottle caps, rubber band, and steel wire. I will connect the different parts of the catapult by using hot glue. I plan to use two classes to finish the catapult, and use one class to finalize and add some final bits and details.  There are not a lot of skill needed, I just need to cut the popsicle sticks and glue it together. To be successful, I have to follow the steps and be accurate when I stick the materials together. Before I put all the things together, I have to carefully watch the tutorial and fully understand what I have to do. Because any wrong measurement or sticking at the wrong place will affect the final prototype, and the swing arm might not work. I believe, if I follow the tutorial on how to make the base and arm connect, then it will work out fine.  If I have time and left materials, I will make a mini basket/ target for the catapult. Since the client of this toy is around 10 years old, while they learn energy transformation, the design should also be engaging and fun. Also, my goal is to let the balls shoot high and one meter away.

My catapult design + sketch: