How is erasing blackboard with duster both push and pull

How is erasing blackboard with duster both push and pull 4 Digging Well Sipping Juice with a straw Erasing blackboard With duster A magnet attracting nails onraCt and ! Why n we press the of a magnetic 1

Dear Student ,
When we rub the board,we push the duster against the blackboard to rub.The duster attracts the chalk particles and pulls them to it and in this order rubs the things written on it.Hence it is both push and pull.

Regards

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We push duster to rub any thing written on board and dusyer pulls the chalk parricles
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