# Why do some objects fall faster than others?

Example : A stone falls faster than a piece of paper. In my book it says that the air resistance affects the acceleration of the paper more than it affects the acceleration of the stone. But why does the air resistance affect the acceleration of the paper more than that of the stone?

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• When objects fall through the Earth's atmosphere they get faster and faster until they reach a speed where the upwards force (air resistance) and downwards force (weight) equal each other. At this point the object travels at its fastest speed called terminal speed.

The paper weighs less so has a smaller force of gravity pulling it down.
As the paper falls its upwards air resistance increases and soon equals its downwards weight, so it then travels at terminal speed. The stone is heavier and has to be travelling a lot faster before its air resistance is large enough to equal its weight.

(from BBC bitesize)

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• Thanks a lot !

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• I don't get this, if the upwards force equals the downwards force, won't that mean that the object is at rest, and not falling at all?
Speed = acceleration x time, so technically free falling objects will all fall at the same speed, regardless of their weight, cause they have the same acceleration, 9.8 m. s^2 (on Earth). The only difference would be the shape of the falling objects. I think. Correct me if I am wrong.

• @Squidward
Equal forces simply means there is no change in velocity (acceleration) Hypothetically, it takes no force for an object to maintain steady velocity. I real life, to many factors are involved to make this observable. Many principles of physics as you are taught are as it would happen in a vacuum (no air resistance, friction, etc)