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Q.

Is it true that a pencil will write on paper but not on glass?


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a

True

b

False  

answer is A.

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Detailed Solution

The above statement is True.
Yes, a pencil will write on paper but not on glass because glass has a flat surface, but a pencil writes on paper owing to friction.
The nature of the contact surfaces affects the frictional force. Friction is greatly reduced if the contact surfaces are smooth. The friction increases together with the roughness. Paper is a rough surface compared to glass. Hence, it is easy to write on paper instead of glass as there is no friction on glass and the pencil tends to slip.
 
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