Here's a breakdown:
* Force due to gravity: This is the force pulling the object downwards, calculated as *F = mg*, where *m* is the object's mass and *g* is the acceleration due to gravity.
* Resistance of the medium: This is the force opposing the object's motion, often called drag. It depends on factors like the object's shape, size, and the density and viscosity of the medium (like air).
* Terminal velocity: As an object falls, its speed increases, and so does the drag force. At a certain speed, the drag force becomes equal in magnitude to the force due to gravity. At this point, the net force on the object is zero, and it stops accelerating. This constant speed is called the terminal velocity.
Key points about terminal velocity:
* It's not a fixed value: Terminal velocity depends on the object's properties and the medium it's falling through.
* It's a balance: Terminal velocity is achieved when the forces of gravity and drag are balanced.
* It's the maximum speed: Once an object reaches terminal velocity, it will not accelerate further, even if it continues to fall.
Example:
A skydiver initially accelerates downwards due to gravity. As their speed increases, air resistance increases. Eventually, the air resistance becomes equal to the force of gravity, and the skydiver reaches terminal velocity. This is why a skydiver doesn't accelerate indefinitely and reaches a constant speed during freefall.
