Question

the surface of mortar and pestle (silbatta) used for grinding is etched again after long use to _____ friction

Answer 1

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Description::
Mortar and pestle or silbatta is a kitchen instrument used to grind various items ...this instrument is based on the principles of Friction ....After a long term use and a lot of grinding it loses its roughness and it becomes useless , therefore for making it useful again it is etched again or groove are scratched on it to make it useful again....
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Answer 2

Answer:

The ‘surface of mortar’ and pestle (sil-batta) used for ‘grinding is etched’ again after long use to increase friction that makes it ‘more effective’ for grinding again.  

Explanation:

In the sil-batta, the grinding is due to ‘friction’ between mortar and pestle. Hence it has to be etched again and again in some time to increase the friction between mortar and pestle. So that the substance can easily grind between both stones.