Question

Why is it difficult to write on glass with a pencil?

Answer 1

Hint:We can explain this question by using the concept of friction because it helps us to write on a paper and therefore it is also responsible for writing on a glass.

Complete Step by Step Answer:Whenever you are writing with a pencil on paper, there exists friction between the pencil and the paper. The pencil's tip is made up of graphite, which gets into pieces and becomes like ink on the paper. It is because of the friction; the graphite is reduced into bits and writes on the paper. Hence, friction plays a significant role in writing with a pencil, and the friction reduces because of polishing.
As the glass is finely polished, it has very less friction and does not give enough friction for the graphite to get reduced into bits. Therefore, it is very difficult to write with pencil on a glass.

Note: Make sure to learn the basic concepts of friction so that it would be very easy to answer this type of conceptual questions.