Friction universally counteracts the motion of an object, causing it to slow down.
A balanced force has no effect on any object: whether it is already in motion or is at rest is not relevant.
A balanced group of forces acting on the object has no effect on its motion. The object continues moving in a straight line at constant speed.
-- In the absence of air resistance, the object's diameter has no effect at all on the projectile motion. -- In the presence of air resistance, one has to know everything about the object AND the air in order to have a prayer of calculating the effect.
The falling object
If the [group of] forces on an object is unbalanced, the object accelerates.
Force is the only such factor.
It resists the motion (slows it down)
When the object is very light or/and the region around the object is very windy!
Shift the wavelength of the spectrum.
Then the effect is as if there are no forces on it at all, and it moves in a straight line with constant speed.
No objects in motion stay in motion barring external force (drag in air)
When the forces acting on an object are balanced, they cancel each other out and the result is no change in its motion.Balanced forces have no effect on motion. Unbalanced forces cause acceleration.