Question

give reason piece of chalk wears out as it is used on a blackboard

Answer 1

Answer:

With every stroke of the chalk piece it leaves some of the chalk on the board.This abrasion of the piece of chalk causes it to wear down.This is because of frictional force.

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Answer 2

Answer: as chalk is rubbed/ used against a blackboard it wears out as friction develops between the two surfaces.

Explanation:

Friction causes wear and tear of objects when it is rubbed against each other.

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