"Moving parts" refer to components within a machine or system that are designed to move in order to perform a specific function. These parts can include gears, levers, pistons, and wheels, which work together to create motion and facilitate tasks. The interaction of these moving parts is essential for the operation of various devices, from simple toys to complex machinery like cars and airplanes. In engineering and mechanics, understanding how moving parts function is crucial for designing efficient systems. Proper maintenance of these components is necessary to prevent wear and tear, which can lead to malfunctions. Regular checks can help ensure that machines, such as engines or robots, operate smoothly and safely.