Choose the term that describes the branch of mechanics dealing with systems subject to acceleration.

The term that describes the branch of mechanics dealing with systems subject to acceleration is dynamics. Dynamics focuses specifically on the behavior of objects in motion, including the forces and torques that affect their acceleration. This field is crucial for understanding how various forces impact the motion of bodies, including in scenarios experienced during physical activities and sports.

In contrast to dynamics, statics is concerned only with systems at rest or in a state of constant velocity, meaning there is no acceleration involved. This distinction is important because it sets the foundational parameters for analyzing different mechanical situations.

Biomechanics, while related to the study of motion, specifically examines the mechanical aspects of biological systems, often focusing on how forces affect living organisms. The English system refers to a system of units used for measurement, rather than a branch of mechanics. Thus, dynamics is the most appropriate term for the study of systems experiencing acceleration.