Prove with the help of an experiment that smoothness of surface reduces friction.
The below activity will illustrate that smoothness of surface reduces friction.
1. Take a pencil or pen and put it on a table.
2. Slightly push the pencil and see how much distance it covers. Mark the point where the pencil stops after the distance covered.
3. Now take some cream or oil. Make a small coating of oil on the table or spread polythene on the table if possible.
4. Again take the pencil and put it at the same initial point.
5. Now push the pencil slightly and let it stop on its own as done earlier.
6. Mark the point where the pencil stops.
7. Observe the difference in the distance.
8. We will see that the distance covered in the second case is more as compared to the first case.
That is less friction is exerted in the second case which eases the movement of the pencil.
This implies, the smoothness of the surface reduces friction.
