Wards Essentials Trebuchet Kit, Material: High quality precision-cut Birch verner pure bond plywood, Designed to be safe and robust, Dry firings and heavy projectiles are no problem, Holes are pre drilled, Medieval weapons, engineering, and physics, Beam arm: 21in
Deluxe Loop Apparatus With Scale, 53 Cm Height, To Demonstrate Transformation Of Potential Into Kinetic Energy. For Demonstration Of Conservation Of Energy, Momentum And Projectile Motion. Loop The Loop Looks Like The Track Of A Roller Coaster
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