Answers

2016-03-05T21:39:46+05:30
Pencil needs a rough surface like paper to write on but glass has a smooth surface and there is also no friction between pencil and glass

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2016-03-05T21:43:54+05:30
Pencil is a substance that works on a rough surface.It will work only on a rough surface like paper.When it is drawn on a smooth surface like glass it will not work.

Hope it helped you ............^_^
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