give reasons - we cannot write on blackboard which is smeared with oil
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Writing with chalk involves the surface of the chalk being scraped off by the roughness of the board, and deposited on the board. With no friction, the chalk would just slide across the board without leaving much behind (and even then, it’d have to be mechanically rough even if frictionless to leave any line).
Hope it helps plz mark as brainliest
Hope it helps plz mark as brainliest
dhirendrashashi:
really..it is correct i want to write in my notebook and i don't think that it is correct ...but thnq for answering
because friction is more on rough surface
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we write on blackboard due to friction if blackboard is oily less friction and thus we can not write on it
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