This is one of the coolest devices we have seen in years! This amazing puck glides on a cushion of air over smooth surfaces and even industrial carpets such as in schools and classrooms. Because it never touches the ground, its movement is nearly frictionless... even on carpet! Give it a push on a horizontal surface and it moves with constant velocity; on an incline it accelerates. With two pucks you can show conservation of momentum, just like balls on a pool table. Purchase two and demonstrate simple collisions right on your classroom floor... no expensive air table or track needed. Built tough enough to kick, it will even survive classroom use!
Runs for about 30 minutes on a 90-minute charge. Rechargeable battery and 9-volt charger included. Colors may vary. 19 cm x 6.4 cm (7.5 x 2.5 inches) (Charger runs on standard North American line current, 110 volts 60 Hz)