#mechanics definition

• Action — A structural physical quantity defined by the product of energy and time, used in analytical and quantum mechanics; a force or influence exerted by one body upon another, according to the principle of dynamics where every action has an equal and opposite reaction. In old technical language, the term is synonymous with action, representing a process of exerting mechanical energy.
• Self-propulsion — The structural capacity of a vehicle, technical system, or body to move through space by generating motive force using an onboard engine or internal energy source, without the input of an external mechanical action (such as towing or pushing). This kinematic principle is fundamental in designing motor vehicles, modern artillery systems, rockets, and combine harvesters, guaranteeing full operational independence during travel.
• Limber — The front part of a vehicle, agricultural machinery, or motor vehicle, comprising the front axle, steering wheels, steering system, and related suspension components. In a historical military context, it denotes a limber, a two-wheeled cart attached to the front of a gun or artillery carriage to allow its rapid towing by horses or motorized vehicles.