This toy is based on the concept of projectile motion. The child would interact with they toy buy adjusting the launch angle, loading the catapult, and firing at a desired target. The ability to change the launch angle gives the child the ability to optimize things like distance and height from their projectile to reach the desired target. This would teach the children much about the parabolic motion of projectiles. 

The cost of this toy could be fairly pricey, similar to some of the medium sized nerf guns, depending on the materials used. While it may cost a little more for quality materials, the toy would be durable. The piece most likely to fail would be the trigger mechanism. This toy presents safety hazards including getting hit by the moving catapult arm and getting hit by whatever projectile the child decided to load the catapult with, assuming he/she opted not to use the foam balls provided.