Final answer:
The steering gear uses a gear ratio to provide a mechanical advantage and make converting rotary motion to linear motion easier for the driver.
Step-by-step explanation:
The component that uses a gear ratio to provide a mechanical advantage and make converting rotary motion to linear motion easier for the driver is the steering gear. The steering gear, also known as the steering rack, is responsible for converting the rotational movement of the steering wheel into linear movement that turns the wheels of the vehicle.
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