VEX-Robotics-406-4208-Hook-Shot-Ball-Machine-by-HEXBUG-VEX-406-4208-P-The-VEX-reg-Robotics-Hook-Shot-Ball-Machine-by-HEXBUG-reg-teaches-important-scientific-lessons-in-kinematics-linkages-reciprocal-motion-&-potential-versus-kinetic-energy-P-P-Spin-the-h&-crank-to-wind-up-the-elastic-powered-striker-arm-to-launch-balls-through-the-loop-system-&-sink-them-in-the-return-basket-Once-constructed-this-machine-will-move-the-balls-in-a-continuous-loop-uphill-at-a-rate-of-approximate