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In a hydraulic system, movement is primarily dependent on liquid pressure. Hydraulic systems operate based on the principles of Pascal’s law, which states that when pressure is applied to a confined fluid, it is transmitted undiminished throughout the fluid in all directions. This characteristic allows the system to transmit force efficiently from one point to another, enabling the movement of machinery or components that are operated hydraulically.

The liquid within the hydraulic system, typically hydraulic fluid, is essential for transmitting this pressure. As the pressure is adjusted, it can cause various hydraulic components, such as cylinders or motors, to move or exert force. This makes liquid pressure the fundamental component that enables movement in hydraulic systems, distinguishing it from other mechanical systems.

The other options involve different forms of energy or forces that do not directly pertain to the operational principle of hydraulic systems. Mechanical force deals with the application of force through physical means, electrical energy pertains to the use of electricity to power devices, and gravity is a natural force but does not directly facilitate the movement in a hydraulic system. Thus, liquid pressure is critical for ensuring that the hydraulic system functions correctly and effectively.