This demonstration is proof that all objects without air resistance will fall at the same rate, regardless of their mass.
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Galileo was the first to discover that dropping two objects from the same height will result in them hitting the ground at the same instant if all air resistance is ignored. The effects of air resistance are most dramatically seen with the classic example of the feather and the bowling ball. The feather’s shape causes it to endure significantly more air resistance than the streamlined bowling ball does, and therefore the feather takes a much larger amount of time to fall to the ground than the bowling ball.
If this experiment were done in a vacuum, there would be no air to form resistance and both objects would fall with constant acceleration – acceleration due to gravity. In other words, all objects fall to earth with the same acceleration (g = 9.8m/s2) but other effects hinder this value.
This demonstration is done in a vacuum and shows the consistency of the acceleration due to gravity.
Before beginning, it is best to make sure that all junctions are securely sealed; any leaks will allow air into the apparatus and ruin the demonstration by causing resistance!