Introduce kids to angles, trajectories and other early physics fundamentals with the Crashapult STEM Challenge from Learning Resources. This hands-on activity set challenges kids to build and complete high-flying obstacle courses designed around core STEM concepts. After setting up their catapults, kids send the launch balls flying off walls, over obstacles and toward the set's included hoop target, funnel, or goal cup. Along the way, they'll have to use their own trial-and-error, engineering and critical thinking skills to make the adjustments to placement and force necessary to successfully complete the included challenges.