* Gravity: Gravity is the force that pulls objects towards the Earth, causing them to accelerate downwards.

* Air Resistance: As an object falls through the air, it encounters resistance from the air molecules. This resistance is called drag or air resistance. The faster the object falls, the greater the air resistance.

* Terminal Velocity: Eventually, the force of air resistance becomes equal to the force of gravity. At this point, the object stops accelerating and falls at a constant speed called terminal velocity.

Factors Affecting Air Resistance:

* Shape: A more streamlined shape (like a teardrop) reduces air resistance, while a wider, flatter shape (like a parachute) increases it.

* Surface Area: A larger surface area exposed to the air means more air resistance.

* Speed: The faster the object falls, the greater the air resistance.

* Density of the Air: Denser air creates more resistance.