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 What makes us write on the black board with a chalk?


Asked by Topperlearning User 28th July 2016, 10:42 AM
Answered by Expert
Answer:

 When we write with chalk on the black board, its rough surface rubs off some chalk particles which stick to the blackboard. This happens due to the friction between the surface of the black board and the chalk.


Answered by Expert 28th July 2016, 12:42 PM
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