Question

when you write on a piece of glass sheet with a piece of chalk, the writing is not clear, why?

Answer 1

this happens because chalk cannot write on a smooth surface, as glass is smoother and has lesser irregularities causing it to house less friction, the chalk will slip off when you write on a glass sheet.or The glass sheet is a smooth surface. The friction that a piece of chalk faces on a glass sheet is much lesser than what it may face when used to write on a board. Hence, the writing is not clear in the case of a glass sheet when used as a writing surface.

Answer 2

hii
because chalk cannot write on smooth surface as glass is smoother and has less irregularties causing it to less friction.