Why does a crumpled sheet and a coin fall the same way?

All bodies in the gravitational field of the Earth are affected by the force of gravity, causing them to have an acceleration of gravity g ≈ 9.8 m / s², with which they fall to the surface of the Earth, if other bodies do not prevent it. If a sheet of paper and a coin are released at a certain height above the surface, the sheet will fall with less acceleration. This is caused by the obstacle to its movement from the air side, since with a low weight, the sheet has extended dimensions. To avoid the effect of air resistance, it is necessary to carefully crumple the sheet of paper and then the crumpled sheet of paper and the coin will fall at the same time, since they will fall with the same acceleration.