Which of the following factors does NOT affect the trajectory of a bullet?

The trajectory of a bullet is influenced by several dynamic factors, with the most significant being velocity, mass, and gravity.

Velocity directly impacts how far and fast the bullet travels. A higher velocity results in a flatter trajectory, while a lower velocity can lead to a more pronounced curve as the bullet travels through the air.

The mass of the bullet also plays a crucial role in trajectory. Heavier bullets can maintain their momentum better against external forces, thus traveling further and maintaining a more stable path compared to lighter bullets.

Gravity is a constant force that acts on all projectiles, including bullets. It pulls the bullet downward as it travels, resulting in a curved path rather than a straight line.

Wind direction, on the other hand, while it can impact a bullet's flight by creating drag or pushing it off course, is an external environmental factor that does not fundamentally alter the projectile's intrinsic properties affecting trajectory. In this context, the option identified does not influence the bullet's flight pattern in the same direct manner as the other listed factors.