What is the difference between a coil spring and a leaf spring?

The choice highlighting that coil springs compress during use while leaf springs consist of multiple stacked plates for support accurately identifies a fundamental difference in design and function between these two types of springs.

Coil springs are cylindrical, wound coils of wire that provide a more independent motion to the vehicle's suspension system. When a load is applied, they compress rather than deform in a lateral manner, allowing for a smoother ride, especially on uneven surfaces. They are often used in modern vehicles due to their ability to absorb shocks effectively.

On the other hand, leaf springs are made up of several strips of metal stacked together, providing support through their length rather than through compression. This structure allows them to carry heavier loads and offer stability, which is particularly advantageous in larger, load-bearing vehicles. Their design is effective for managing weight distribution, but it doesn't provide the same degree of flexibility and comfort as coil springs.

This distinction is critical in understanding how each spring type impacts vehicle handling, load capacity, and ride comfort. It informs decisions about vehicle design and maintenance, highlighting why certain types of springs are favored based on the intended use of the vehicle.