Free Fall In Vacuum - Guinea And Feather

Purpose

To demonstrate that bodies of extremely different densities fall with equal acceleration in the absence of air friction.

Equipment

Tube with weight and feather inside, mounted on vacuum pump cart as photographed.

Suggestions

Tube with weight and feather inside, mounted on vacuum pump cart as photographed.

Setup Time

5 min.

Images

c4-32

Description

A long tube with a small weight and a feather inside is evacuated. Upon evacuation the weight and the feather fall with the same acceleration. With air in the tube, the feather falls much more slowly than the weight.