I wanna ask how does an eraser removes pencil marks?Why rubbing with our fingers or anything else removes it?

Question

Has it anything to do with friction??????

Answer 1

No friction.

The molecules are 'sticky' enough to pick up the graphite molecules left on the paper. Sometimes they pick up the paper as well...lol. Your fingers can move *some* of the graphite, but usually not enough to make it worth not buying an eraser.

Before erasers were invented, people used rolled up white bread to remove the pencil marks. Again, it bonded with the graphite molecules enough to remove it from the paper.

Answer 2

The eraser material is somewhat sticky so the pencil and paper fibres stick to it. Also the surface of the eraser material breaks off as you use it, exposing more clean sticky surface. Fingers and most other materials don't have these two features and will rub the pencil further into the paper. Nothing to do with friction, a good 'putty' rubber will lift off pencil marks with virtually no rubbing at all.

Answer 3

instead of a plastic based rubber, try a lump of blue/white tac. it works the same. but removes it quicker because of its stickyness, some othe plastics do the same

Answer 4

http://www.fluther.com/disc/5100/how-doe...