why do objects fall faster when they are close together?

Answer 1

um i dont think that statements true...
first off....everything falls at the same rate of acceleration
9.81 m/s^2....thats the power of gravity on earth
But due to air resistance, a rock will fall much faster than a piece of tissue, because the piece of tissue will have a greater force of air resistance acting against it as it falls

now im not sure but a rock MAY fall faster if there's a second rock falling beside it since they both are breaking the static air surrounding both of them, thus reducing the air resistance a bit.
But if u chuck 2 opened parachutes out the window.....would they fall faster? if u stick a whole buncha parachutes together....wouldnt they fall slower?

Answer 2

It is due to drafting/ slipstreaming.
"a technique in sports racing where competitors align in a close group in order to reduce the overall effect of drag or fluid resistance of the group. Especially when high speeds are involved, drafting can significantly reduce the average energy expenditure required to maintain a certain speed. Drafting is usually to reduce wind resistance and is seen most commonly in bicycle racing, car racing, and speedskating though is occasionally used even in running."
http://en.wikipedia.org/wiki/Drafting_(racing)

Answer 3

They divide the air resistance between them. Total guess, I heard something similar in a movie.

Answer 4

The two objects weigh more! The heavier the object the harder and faster it will fall.