Which type of steering system requires less physical effort by the driver?

A power steering system is designed to assist the driver in steering the vehicle, significantly reducing the physical effort required to turn the steering wheel. This is achieved through the use of hydraulic or electric actuators that amplify the driver's input, making it easier to turn the wheels, especially at low speeds or while parking.

In contrast, a manual steering system relies solely on the driver's strength to turn the wheels, which can be tiring in larger or heavier vehicles. While both rack and pinion and recirculating ball systems can be power-assisted, they do not inherently reduce physical effort unless they are designed as power steering systems. Thus, the distinction lies in the fact that only the power steering system provides this level of assistance across various driving conditions.