Why is it possible to write on rough blackboard with chalk ?
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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.
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8
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.
Explanation:
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