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This model demonstrates a classic device for examining free falling objects. It shows that all objects experience the same gravitational acceleration and fall at the same rate in a vacuum, but in air, air resistance affects objects differently, slowing some down more than others. For example, when the air inside the tube is at atmospheric pressure, the feather falls significantly more slowly than the coin. Removing the air from the tube with a vacuum pump causes the feather and coin to fall at the same rate, as there is no air resistance to slow the feather. This concept was first discovered by Galileo, who demonstrated that in a vacuum, two objects dropped from the same height will hit the ground at the same time, regardless of their weights.
