Question

Give reasons.
a) It is difficult to move an object on a rough surface.​

Answer 1

Question:-

It is difficult to move an object on a rough surface. WHY?

Answer:-

It is difficult to move an object on a rough floor is because of FRICTION.

The friction is less on a smooth floor as compared to a rough floor.

Answer 2

Answer:

Friction is always more on a rough surface compared to a smooth surface. This is because rough surface offers more resistance to the movement of an object over it compared to a smooth surface.

Explanation:

Friction occurs because no surface is perfectly smooth. Even surfaces that look smooth to the unaided eye make look rough or bumpy when viewed under a microscope. The aluminum foil is so smooth that it's shiny. However, when highly magnified, the surface of metal appears to be very bumpy. All those mountains and valleys catch and grab the mountains and valleys of any other surface that contacts the metal. This creates friction.