The sharp tip of a pencil becomes blunt after writing for a while due to friction.
A sharp edge blade is more effective in cutting than a blunt blade due to .
Using a sharp tip of the pencil, mark a dot on the paper. This dot is called a __.
Using the sharp tip of a pencil, mark a dot on the paper this dot is called a __.
Using the sharp tip of a pencil, mark a dot on a piece of paper. This dot is called a __.