Question

The surface of mortar and pestle used for grinding is etched again after long use to keep same friction remove friction increases or decrease friction

Answer 1

Answer:

Ans. increase

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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Explanation:

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