Final answer:
Oiling parts of a machine reduces friction, enabling higher efficiency and smoother operation, subsequently decreasing wear and extending the lifespan of the machine.
Step-by-step explanation:
It is necessary to oil movable parts of a machine to reduce friction which, in turn, lowers wear and tear on the components. Oiling helps in achieving a higher efficiency by allowing the parts to move smoothly against each other. When two surfaces in a machine make contact, there is resistance due to static friction, which is typically higher than kinetic friction. By lubricating these surfaces, oil minimizes the static friction, making it easier to get the machine started. It also reduces kinetic friction, keeping the machine in motion with less force required. Adding oil lowers the energy needed to maintain movements, thus conserving power and reducing heat generated from friction, which could otherwise lead to part degradation or system failure.
Lubrication also plays a critical role in piston engines, where it reduces the vibrations caused by the thrust of individual piston firings. The flywheel smooths out these vibrations for a stable performance. In hydraulic systems, such as those in cars and heavy machinery, oil not only lubricates but also transmits pressure evenly across the system to ensure reliable operation.