To sharpen the blade of a knife by rubbing it against a surface, which of the following will be most suitable?
$(a)$. Stone
$(b)$. Plastic block
$(c)$. Wooden block
$(d)$. Class block

Academic Physics NCERT Class 8

Rubbing the blade of a knife on the surface of a stone will be most suitable as it will give more friction than a plastic block, wooden block, or class block.

so, option $(a)$ is correct.

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Updated on: 10-Oct-2022

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