CBSE Class 8 Answered
What makes us write on the black board with a chalk?
Asked by Topperlearning User | 28 Jul, 2016, 10:42: AM
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 | 28 Jul, 2016, 12:42: PM
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