The eraser gets smaller and smaller as you use it more and more. Explain the reason.

When we rub an eraser on paper, friction acts between the surface of the eraser and the paper. This frictional force opposes the motion and causes tiny particles of the eraser material to wear away along with the graphite particles from the pencil marks. Repeated rubbing gradually removes more and more of the eraser’s material. This continuous loss of material due to friction is why the eraser becomes smaller over time.