Final answer:
Ballistics is the physics subfield that deals with the study of projectile motions, like bullets, focusing on their trajectories and forces.
Step-by-step explanation:
The study of motions of projectiles, such as bullets, is known as ballistics. This field encompasses the analysis of trajectories, forces, and impacts connected with projectile motion. In physics, projectile motion is the motion of an object thrown or projected into the air, influenced solely by the acceleration due to gravity.
With projectiles, the path they follow is called their trajectory, which is typically a parabolic shape due to gravitational forces acting on the object. In the absence of air resistance, these objects follow predictable paths dictated by initial velocity and gravitational acceleration. It's a subfield of physics that deals with two-dimensional motion, where objects like footballs or bullets move in a curved path under the influence of gravity alone.