After prolonged use, the mortar and pestle lose their roughness, due to which ____ force reduces, and it doesn’t work satisfactorily.

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After prolonged use, the mortar and pestle lose their roughness, due to which frictional force reduces, and it doesn’t work satisfactorily.
The mortar and pestle lose their roughness after a long period of use, causing the frictional force to decrease and the mortar and pestle to stop operating properly. As a result, we'll have to etch it again to make it rough. The frictional force is the force produced when two surfaces come into contact and slide against each other. Friction is caused by irregularities on the two surfaces that come into contact. As a result, when one object moves over another, the surface irregularities become entangled, causing friction. The more the roughness, the more irregularities and the greater the friction.

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