Do heavier objects fall faster than lighter objects? At the Leaning Tower of Pisa, the presenter explains how the Greek philosopher Aristotle worked using logic, not experimentation, and claimed heavy items would always fall to the ground first. This hypothesis went largely untested until Galileo threw objects of different weight from the top of the Tower of Pisa and found this not to be the case. Includes footage from the space mission to the Moon where the astronauts tested Galileo's hypothesis in the airless environment, using a feather and a hammer, to find out if his hypothesis was true.
This clip looks at the importance of testing theories and could be a good starting point when discussing the formation of hypotheses. The initial part of the clip could be used to ask the pupils to devise investigations to test the theory for themselves. It could also be used before engaging in work surrounding gravity and drag forces such as air and water resistance.