[raygun]

Acceleration is a vector with a scalar magnitude. When the air is sufficiently dense, the air decellerates whatever debris is shed. When the air is thinner, decellerations is insufficient whereby Delta-V is minimal with respect to acceleration of the launch vehicle.

[markman46]

in other words the denser the air the more a small object would fly around, the thiner the air an object will just fall stright?