Vehicle dynamics (mechanical engineering) is the academic and applied field within mechanical engineering concerned with the study of the forces acting upon a vehicle and the resulting motion and behavior of the vehicle as a dynamic system. This discipline investigates aspects such as ride quality, handling characteristics, stability, control, and performance under various operating conditions. It applies principles of physics, mechanics, and control theory to analyze, simulate, test, and optimize the dynamic behavior of vehicles, including ground vehicles, aircraft, and spacecraft, playing a critical role in their design and operation to ensure safety, efficiency, and desired performance.