The hovercraft travels easily because the air released from the balloon creates an air cushion below the CD and lifts the device slightly off the ground. This cushion of air helps to separate the hovercraft from the surface it’s gliding over, which reduces friction between the mechanism and the surface. Less friction means less resistance, and this allows the appliance to travel longer distances with less force applied to it. In addition, the CD helps to keep the apparatus parallel to the surface it’s traveling over, and distributes the weight of the craft over a larger area. This enables the hovercraft to be moved with a smaller amount of force.