We made paper helicopters and through our exploration and investigation we observed how gravity pulled the helicopters down. The shape of the rotor blades made our helicopters spin when dropped from a height. We also bent the rotor blades the other way around and we saw that our helicopters spun in a different direction. We each had a small paper helicopter and a large one. The helicopter with the longest rotor blades took longer to reach the ground than the one with the shorter rotor blades as it experienced more air resistance. We also made one of our helicopters much heavier than the other by attaching paper clips on to it and discovered that the heavier helicopter fell to the floor first. 
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