Age Range: 8+ Catapult Engineering Explore the physics of medieval warfare and motion through hands-on engineering. Build six dynamic catapult and trebuchet models, then conduct experiments that reveal how force, energy, and trajectory work in the real world. Each model launches projectiles, making abstract physics concepts tangible and exciting. The comprehensive 32-page illustrated guide walks you through construction and discovery at every step, turning engineering into adventure. Roller Coaster Engineering Children can piece together the sturdy frame structures and then attach the flexible track to it to build and test endless roller coaster designs to learn about the physics of force, motion, and energy. Help the children get a practical introduction to many physics principles including gravitation, potential energy, kinetic energy, free fall, projectile motion, friction, centripetal force, velocity, acceleration, and more. A large, full-color manual guides you through the model assembly and experiments with step-by-step illustrated instructions.