# How does air resistance affect motion?

Air resistance is a type of friction (a force that opposes movement) that occurs between air and another object. It is the force that the object experiences when it passes through the air. Air resistance and gravity are the two fixed forces of nature that move on any object on Earth. The above diagrams illustrate a key principle.

When an object falls, its speed increases. The increase in speed leads to an increase in the amount of air resistance. Finally, the force of air resistance becomes large enough to balance the force of gravity. At this instant, the net force is 0 Newton; the object will stop accelerating.

The object is said to have reached a terminal velocity. The change in speed ends as a result of the balance of forces. The speed at which this occurs is called the terminal speed. This is because air has to push this object back and slow it down.

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At very slow speeds, the force of gravity is much stronger than the force of air resistance, and the object falls straight down. For objects that fall close to the Earth's surface, the effect of air resistance becomes more noticeable as the velocity of the object increases. When an object moves through air (or any other fluid), the substance resists movement. The air force is exercised in the center and tangential to its circular trajectory, developing a thrust in the center.

Therefore, more massive objects fall faster than less massive objects because a greater force of gravity acts on them; for this reason, they accelerate at higher speeds until the resistance force of air equals the force of gravity. The more surface an object has, the greater its resistance to airflow and the less likely it is to be able to move through space at a given speed. The flight time is directly proportional to the velocity of the object in the air and is inversely related to the gravitational acceleration. Although air is extremely light and takes up much more space than the object, it can affect the way an object moves through the air.

The resistance of the air is exerted upwards against the direction of Earth's gravity and slows down the velocity of the object. With air resistance, acceleration during a fall is lower than gravity (g) because air resistance affects the movement of the falling object by slowing it down. Air resistance slows down the velocity of the object by acting in the opposite direction of its movement. Air resistance is responsible for increasing the flight time of an object in the air; this implies that the vertical velocity decreases.

Let's analyze the reason behind the negligible air resistance that is felt on the moving object of the projectile. .