Demonstrate the classic free fall experiment in a vacuum.
An economical version of a classic device. This apparatus demonstrates that all objects experience the same gravitational acceleration and fall at the same speed in a vacuum, but in air the air resistance slows down some objects more than others. Features a disc and a feather in a tough, clear, plastic tube, 90 cm long and 4.5 cm diameter, with rubber end caps and hose cock for connection to any standard vacuum pump (not included). Includes activity guide.