Build an easy popsicle stick catapult for a simple STEM activity for kids. A catapult is a great physics science experiment and engineering activity for kids. Try a catapult building activity for a kid's STEM project or science activity.
How to Build a Strong Catapult. The strength of a catapult could refer either to the sturdiness of the catapult frame and its ability to withstand use, or it could refer to the force with which the catapult launches projectiles.