Dynamics System Track and Cart - The Dynamics Systems is perfect for experiments in Newton's Laws, collisions, velocity and acceleration. Get the advantages of a very low-friction apparatus of an air track. The cart has low-friction ball-bearing wheels and a spring-loaded suspension to give students an experience as close to friction-free as possible. This system is designed to easily integrate the Sparks Motion Sensor probes, to get high quality real-time data without the frustration.