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What type of friction do you use when you leave marks on paper with pencil lead?

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Why does a pencil leave a mark on paper?

When a pencil is rubbed on paper fiction causes a small amount of the graphite from the core of the pencil to be left on the paper. This leaves a visible mark.

Is lead used in pencils?

No. Lead used to be used in pencils but they stopped using it in them becasue of lead poisoning from pencils. Now they use graphite instead

If you scan a piece of paper will there be pencil marks on the scanned paper?

  Yes, a scanner is like a copy machine. If it is on the paper, it will be copied into the digital image. You may use photo editing software to remove any marks or flaws t

Do mechanical pencils use lead?

Yes. All pencils use lead - not the element, but a graphite and clay mixture molded into a long narrow strip.

Why must you use a pencil and not ink to mark the chromatography paper?

a chromotagraphy is intended to split up a mixture of compounds into its subparts. if you use a pen, the ink will also be separated. that is why you use a pencil instead. Grap