A piece chock wares out as it is used on black board
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The piece of chalk wares out when it is used on the black board because for writing on the blackboard you need the help of friction.
You also know that due to friction wearing and tearing occurs. Therefore this is the correct reason why a piece of chalk wares out
You also know that due to friction wearing and tearing occurs. Therefore this is the correct reason why a piece of chalk wares out
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