g, acceleration due to gravity

You're most probably familiar with the equation weight, w = mass x g, where g is the acceleration due to gravity. And g is usually given as 9.81 m/s^2

You may also know that g is more or less constant around us. But will you realise that since acceleration is constant irregardless of mass, should a feather drop and hit the ground the same time as a hammer?

Well, we know that doesn't occur because the feather traps air and has a much higher air resistance than the hammer. Hence the feather is slowed down by the air as it drops down. However, can you think of a place where you can do this experiment without the interference of air resistance?

Link: http://www.youtube.com/watch?v=4mTsrRZEMwA