To sharpen the blade of a knife by rubbing it against a surface, which of the following will be most suitable?
$(a)$. Stone
$(b)$. Plastic block
$(c)$. Wooden block
$(d)$. Class block

AcademicPhysicsNCERTClass 8

Rubbing the blade of a knife on the surface of a stone will be most suitable as it will give more friction than a plastic block, wooden block, or class block.

so, option $(a)$ is correct.

Updated on 10-Oct-2022 13:29:10