Forces Acting on a Falling Object
* Gravity (Downward Force): The primary force acting on a falling object is gravity. This force pulls the object towards the center of the Earth. The force of gravity is proportional to the object's mass.
* Air Resistance (Upward Force): As an object falls through the air, it encounters resistance from the air molecules. This resistance is called air resistance, drag, or friction. Air resistance acts in the opposite direction of the object's motion, slowing it down.
Key Concepts
* Terminal Velocity: As an object falls, air resistance increases. Eventually, the upward force of air resistance will equal the downward force of gravity. At this point, the object stops accelerating and reaches a constant speed called terminal velocity.
* Factors Affecting Air Resistance: The amount of air resistance depends on several factors:
* Shape: A streamlined object experiences less air resistance than a blunt object.
* Size: Larger objects have a greater surface area and therefore experience more air resistance.
* Speed: Air resistance increases with the square of the object's speed.
* Density of the Air: Denser air (like at higher altitudes) will produce more air resistance.
Summary
The upward force exerted on a falling object is air resistance. It opposes the downward force of gravity, slowing the object's descent. The magnitude of air resistance increases as the object falls faster.
