An air source is required to operate the track, which is not included (see code X165025). These kits contain everything required for an array of experiments covering: velocity, force and acceleration, potential energy, kinetic energy, conservation of energy, SHM, motion on level and inclined planes and more. Air tracks are made from high strength extruded aluminium. The gliders are designed to accept standard slotted masses for additional loads and are supplied with a comprehensive accessory pack.