* Acceleration due to Gravity: Objects in free fall accelerate at approximately 9.8 m/s², not 10 m/s. This acceleration is due to the force of gravity pulling them towards the Earth.

* Friction and Air Resistance: While friction and air resistance do act on falling objects, they *oppose* the acceleration due to gravity. This means they slow the object down, not cause it to accelerate.

In summary: Free falling objects accelerate at approximately 9.8 m/s² due to gravity. Friction and air resistance act against this acceleration.