How do you explain air resistance?

Answer 1

In fluid dynamics, drag (sometimes called air resistance or fluid resistance) refers to forces that oppose the relative motion of an object through a fluid (a liquid or gas).

Drag forces act in a direction opposite to the oncoming flow velocity.[1] Unlike other resistive forces such as dry friction, which is nearly independent of velocity, drag forces depend on velocity.[2]

For a solid object moving through a fluid, the drag is the component of the net aerodynamic orhydrodynamic force acting opposite to the direction of the movement. The component perpendicular to this direction is considered lift. Therefore drag opposes the motion of the object, and in a powered vehicle it is overcome by thrust.

In astrodynamics, and depending on the situation, atmospheric drag can be regarded as an inefficiency requiring expense of additional energy during launch of the space object or as a bonus simplifying return from orbit.

Answer 2

Air resistance is the force that acts in the opposite direction to the motion of an object moving through the air. It occurs because air molecules collide with the surface of the object, causing a drag force that slows down the object's motion. The greater the speed and surface area of the object, the greater the air resistance.