An aerospace engineer is testing the mechanical properties of a polyurethane damping block designed to absorb shock in a drone's landing gear. During a test, they measure the compressive force applied and the resulting compression as the block is compressed (loaded) and then allowed to expand back to its original shape (unloaded).
The results are plotted on the force-compression graph below:
Explain what the shaded area enclosed by the loading and unloading curves represents, and why this physical property is desirable for a landing gear system.