Air

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Correction to experiment 5.  The conclusion given is incorrect.  The acceleration of an object does not change when the weight is changed.  For example if an empty soda bottle and a full soda bottle are dropped from the same height, the bottles will reach the ground at the same time.  The reason that we see heavier objects often hit the ground first is because of less air resistance than with a lighter object. When the toy was added to the parachute, the shape of the dropping parachute with the toy was changed in such a way that the air resistance was decreased and the toy fell faster.  See the first link below for the feather/hammer drop performed on a moon walk.