Question

a pencil of eraser loses their piece of rubber each time you use it ? why do this happen

Answer 1

=> When we use a pencil eraser, friction between the eraser and the paper rubs off some rubber particles from the eraser. Thus, the eraser loses tiny pieces of rubber due to friction.

HOPE IT HELPS ✌

Answer 2

It happens because , anything which is in limited amount and being used that will decrease in its amount ! in the same way ,when we use the eraser to rub , it loses its quantity ( Size ) !

I think it helped you :)