With its air source built in, this provides a frictionless, two dimensional 60 cm x 90 cm surface for the study of velocity, acceleration, Newton's Laws, center of mass, elastic and inelastic collisions, linear and angular momentum, conservation of momentum, moment of inertia, centripetal force, simple and complex harmonic motion. The smooth surface is ideal of photographic studies and has threaded inserts strategically positioned for use with accessories. Includes corner posts, bumper wire, tension adjustment bolts, levelers, pucks, springs, and hook and loop collars.