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.

The one rubbed with sand paper shines more than the other because:

⇒ When the metal sheet is rubbed with sand paper, it produces more friction between metal sheet and sand paper.

⇒ As a result, the force is enough to remove easily all the dust particles present on metal sheet, so it shines more.

⇒ On the other hand, when the metals sheet is rubbed with ordinary paper, it does not produce enough force of friction to remove dust particles.

⇒ Thus, the metal sheet rubbed with ordinary paper shines less.