Question

you use ______ friction when you leave marks on paper with a pencil \lead.\

Explanation:

When using a pencil "lead" to leave marks on paper, the type of friction involved is sliding friction. Sliding friction occurs when two surfaces slide over each other. In this case, the pencil lead (graphite) slides over the paper surface, and the friction between them causes small particles of graphite to be left behind as marks.

Answer:

sliding