Explanation:

Introduction:
Frictional force is a force that opposes the motion of an object when it is in contact with a surface. It acts parallel to the surface and depends on the nature of the surfaces in contact and the force pressing them together.

Smooth Surface:
A smooth surface is one that is even, polished, and free from roughness or unevenness. It has a low coefficient of friction, which means that there is less resistance to motion when an object moves across it.

Frictional Force:
Frictional force is the force that opposes the motion of an object. It arises due to the interaction between the surfaces in contact. The magnitude of the frictional force depends on two factors: the nature of the surfaces in contact and the force pressing them together.

Less Frictional Force:
When the surface is smooth, there are fewer irregularities or roughness on the surface, which reduces the points of contact between the two surfaces. This results in a smaller surface area in contact, reducing the frictional force. Additionally, the smooth surface allows objects to slide or move more easily, further reducing the frictional force.

Explanation:
The statement "Smooth surface has less frictional force" is true. A smooth surface has less frictional force compared to a rough surface. This is because the smooth surface has fewer irregularities or roughness, which reduces the points of contact and the surface area in contact between the two surfaces. As a result, there is less resistance to motion, and the frictional force is reduced.

When objects slide or move on a smooth surface, there is less frictional force acting against the motion. This allows objects to move more easily and smoothly. For example, if you try to slide a heavy object on a rough surface, it would require more force compared to sliding the same object on a smooth surface.

In everyday life, we can observe this phenomenon when we use lubricants like oil or grease on surfaces to reduce friction. The lubricants fill in the gaps and irregularities on the surface, making it smoother and reducing the frictional force.

In conclusion, a smooth surface has less frictional force due to its reduced points of contact and surface area in contact. This allows objects to move more easily and smoothly on a smooth surface compared to a rough surface.