* Magnitude: Air resistance is generally less than the force of gravity, especially at lower speeds. As an object's speed increases, air resistance increases, but it usually never completely matches the force of gravity.
* Direction: Air resistance always acts opposite to the direction of motion, while gravity always acts downward. This means that air resistance will always be upward when an object is falling.
* Dependence: Air resistance depends on several factors, including:
* Shape: Streamlined objects experience less air resistance than objects with a larger surface area.
* Speed: Air resistance increases with the square of the object's speed.
* Density of the air: The denser the air, the greater the air resistance.
* Terminal Velocity: As an object falls, air resistance increases until it balances the force of gravity. This point is called terminal velocity. The object stops accelerating and falls at a constant speed.
In Summary:
* Air resistance opposes gravity, but is usually smaller in magnitude.
* The ratio of air resistance to gravity changes with speed and object characteristics.
* At terminal velocity, air resistance equals gravity.
It's important to remember that air resistance is a significant factor in many situations, especially at high speeds, and can significantly affect the motion of objects.
