Question

Chalk particle cling to the black board due to.."​

Answer 1

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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Answer 2

• When we use chalk to write on a black board, the rough surface scratches off some chalk particles, which adhere to the blackboard. The friction between the black board's surface and the chalk causes this to happen.
• The force of adhesion is the force of attraction between the molecules of various substances. We can use a chalk to write on the blackboard because of the adhesive force.Frictional motion occurs when we write on the chalkboard.
• The frictional motion allows to write on the chalkboard smoothly and effortlessly.When writing with chalk, the roughness of the board scrapes the surface of the chalk, which is then deposited on the board.
• Without friction, the chalk would simply slide over the board, leaving little behind (and even if frictionless, it would have to be mechanically rough to leave any line).