>>14048728No, the greentext statement isn't correct because there are different aerodynamic properties of objects, which cause drag. Since the atmosphere is comprised of particles that have mass and area, they cause friction against an object moving through them at the surface of the object.
When you move through a swimming pool, you might notice that you're less able to walk through water then you can through air. This is because the water has a higher viscousity.
This viscousity causes there to be more drag on your movement through it than if you were moving through air.
When an object falls through our atmosphere, a boundary layer of air forms where there is laminar flow, this is where it isn't chaotic and where drag is exerted over the surface area of the object. Since drag can have surface area dependencies (for a boundary layer), the shape of an object matters when determining its fall speed.
Another factor is buoyancy, which is where the pressure of all the fluid around you causes an upward force because of the fluid you are displacing.
This happens whenever an object is in a fluid, and can help counteract the effect of gravitational pull if an object has a small enough density.
For instance, if you took a helium ballon, it will seem to rise from your perspective because the buoyant force on the ballon from the surounding air is greater than the force of gravty on it.
but you might say "A balloon doesn;'t fall!"
but it is still affected by gravity, and other forces. It is not being held up by a planted object. It is free to move through air, but instead of going down, it goes up.
Both of the factors I mentioned impact fall speed of objects, and it is why there is a concept called "Terminal velocity" where the other forces opposing the pull of gravity cause a falling object to reach a maximum fall speed.
