Question

We have two identical metal sheets. One of them is rubbed with sand paper and the other with ordinary paper. The one rubbed with sand paper shines more than the other.
Give reason.

Answer 1

Hi friend this is indeed a good question.

We all know that the sand paper has a rough surface which is due to the embedded sand particles. These particles when observed under microscope have sharp and irregular surface. So when we scrape the metal sheet with these papers they create scratches on the surface of the metal sheet. When the surface of sheet is scratched the shiny lustrous metal is seen.
But this doesn't happen with the ordinary paper as they are smooth and cannot scrape the metal surface.

Answer 2

Explanation:

The sandpaper creates more friction between the metal sheet and it as compared to the plain paper. Therefore, the sandpaper makes the sheet shinier by removing the top layer of the metal sheet.The friction between sand paper and metal sheet is very large compared to that between the ordinary paper and the metal sheet. Thus the sand paper is able to remove the outer dull layer from the metal sheet more effectively and makes it more shining.The friction between sand paper and metal sheet is very large compared to that between the ordinary paper and the metal sheet. Thus the sand paper is able to remove the outer dull layer from the metal sheet more effectively and makes it more shining.