Writing with a pencil on paper involves the friction between graphite and paper, leading to the shearing of graphite into thin flakes. These flakes adhere to the paper fibers and may penetrate into the surface pores, with finer particles achieving deeper penetration. The adhesion between graphite and paper is primarily mechanical, with some contribution from van der Waals forces, although the latter's impact is minimal. Understanding these interactions is crucial for applications in writing and drawing materials.
PREREQUISITESMaterial scientists, artists, educators, and anyone interested in the physics of writing instruments and their interaction with surfaces.